Size Chart Converter API

API ID 14590

Shoe, ring, hat and clothing sizes between US, UK, EU and Japan, with brand-variance ranges.

API Documentation

Endpoints

Request
Through foot length in mm. Adults: US men's = 3 × foot (in) − 22, US women's = men's + 1.5 (womenScale=common) or + 1 (fia), UK = 3 × foot (in) − 23, EU = 3/20 × foot (mm) + 2, JP/KR/CN/Mondopoint = foot length. Kids: US 0C-13.5C then youth 1Y-7Y, UK 0-13.5 then the adult scale; a kids size 1-6.5 needs C or Y ("2C", "2Y") because both scales use those numbers. EU ranges reach up a size because many makers label EU larger than the formula.
Endpoint ID: 37388
GET https://zylalabs.com/api/14590/size+chart+converter+api/37388/convert+a+shoe+size
INPUT PARAMETERS

Convert a shoe size — Endpoint Features

Object Description
size Required The size as written on the label or chart. Numbers take decimals, commas or fractions ("9.5", "9,5", "9½", "9 1/2", "42 2/3" for EU thirds, "10.5C" or "3Y" for US kids).
from Required The size system of "size".
group Required men, women or kids: picks the US and UK scales.
womenScale Optional US women's scale: common (men's + 1.5, default) or fia (men's + 1).

Free test requests remaining: 3 of 3.


INPUT PARAMETERS

size
from
group
womenScale
API EXAMPLE RESPONSE
JSON
{
    "category": "shoe",
    "group": "men",
    "womenScale": "common",
    "input": {
        "size": "9",
        "system": "us",
        "read": 9,
        "label": "US men's 9"
    },
    "footLength": {
        "mm": 262.5,
        "cm": 26.25,
        "in": 10.33
    },
    "sizes": {
        "us": {
            "size": "9",
            "value": 9,
            "exact": 9,
            "label": "US men's 9",
            "range": {
                "low": "8.5",
                "high": "9.5"
            }
        },
        "usWomen": {
            "size": "10.5",
            "value": 10.5,
            "exact": 10.5,
            "label": "US women's 10.5",
            "range": {
                "low": "10",
                "high": "11"
            }
        },
        "uk": {
            "size": "8",
            "value": 8,
            "exact": 8,
            "label": "UK 8",
            "range": {
                "low": "7.5",
                "high": "8.5"
            }
        },
        "eu": {
            "size": "41.5",
            "value": 41.5,
            "exact": 41.37,
            "label": "EU 41.5",
            "range": {
                "low": "41.5",
                "high": "42.5"
            }
        },
        "jp": {
            "size": "26",
            "value": 26,
            "exact": 26.25,
            "label": "JP 26 cm",
            "range": {
                "low": "25.5",
                "high": "26.5"
            }
        },
        "kr": {
            "size": "260",
            "value": 260,
            "exact": 262.47,
            "label": "KR 260",
            "range": {
                "low": "255",
                "high": "265"
            }
        },
        "cn": {
            "size": "260",
            "value": 260,
            "exact": 262.47,
            "label": "CN 260",
            "range": {
                "low": "255",
                "high": "265"
            }
        },
        "mondopoint": {
            "size": "260",
            "value": 260,
            "exact": 262.47,
            "label": "Mondopoint 260",
            "range": {
                "low": "255",
                "high": "265"
            }
        }
    },
    "basis": {
        "us": "US men's = 3 × foot length (in) − 22 (customary US scale, men's 1 = 25 barleycorns of last).",
        "usWomen": "US women's = 3 × foot length (in) − 20.5 (the common scale: men's + 1.5).",
        "uk": "UK adult = 3 × foot length (in) − 23 = 3/25.4 × L − 23 (barleycorn scale with a two-size last allowance).",
        "eu": "EU (Paris point, 2/3 cm) = 3/20 × L + 2 = 1.5 × last length (cm), last = foot + 2 Paris points.",
        "jp": "Japan (JIS S 5037): foot length in cm, 0.5 cm steps.",
        "kr": "Korea (KS M 6681): foot length in mm, 5 mm steps.",
        "cn": "China (GB/T 3293.1): foot length in mm, 5 mm steps (many Chinese shops also print EU numbers).",
        "mondopoint": "Mondopoint (ISO 9407): foot length in mm; 5 mm steps for casual and sports shoes."
    },
    "notes": [],
    "variance": {
        "sizes": 0.5,
        "note": "Expect about half a size either way between brands for the same foot. \"range\" shows the labels this foot could carry.",
        "details": [
            "Brands' EU labels often run 0.5-1 size above the standard formula for the same UK or US size (1.5 for children's shoes), so EU ranges reach up.",
            "US women's sizes are usually men's + 1.5 (\"common\" scale); some makers use men's + 1 (\"fia\"). Set womenScale to match.",
            "A brand's \"cm\" label is often the shoe's inside length, 0.5-1 cm more than the foot; JP/KR/CN/Mondopoint here are foot length.",
            "Width (narrow, wide) and the shoe's style (boots, running, dress) change the fit more than the conversion does."
        ]
    },
    "disclaimer": "Sizes vary by brand, style and country of manufacture. These conversions come from public sizing formulas and body-measurement rules, not from any brand's chart: treat them as a starting point and check the brand's own size chart and measurements before buying, selling or listing."
}
Convert a shoe size — CODE SNIPPETS

curl --location --request GET 'https://zylalabs.com/api/14590/size+chart+converter+api/37388/convert+a+shoe+size?size=9&from=us&group=men&womenScale=common' --header 'Authorization: Bearer YOUR_API_KEY' 


    
Request
Through the inside circumference in mm (ISO 8653). US/Canada: diameter = 11.63 + 0.8128 × size mm; UK/Australia letters: 1.25 mm of circumference per letter, C = 40 mm (BS 6820); Swiss/Italian/Spanish = circumference − 40; Japan ≈ circumference − 40 (approximate). Aliases: ca, mx (US), au, ie, nz, za (UK), eu, fr (ISO), it, es (Swiss), cn, kr (Japan).
Endpoint ID: 37389
GET https://zylalabs.com/api/14590/size+chart+converter+api/37389/convert+a+ring+size
INPUT PARAMETERS

Convert a ring size — Endpoint Features

Object Description
size Required The size as written on the label or chart. Numbers take decimals, commas or fractions ("9.5", "9,5", "9½", "9 1/2", "N½" or "N 1/2" for UK letters, "Z+2").
from Required The ring size system.

Free test requests remaining: 3 of 3.


INPUT PARAMETERS

size
from
API EXAMPLE RESPONSE
JSON
{
    "category": "ring",
    "input": {
        "size": "7",
        "system": "us",
        "read": 7,
        "label": "US 7"
    },
    "circumference": {
        "mm": 54.41,
        "in": 2.142
    },
    "diameter": {
        "mm": 17.32,
        "in": 0.682
    },
    "sizes": {
        "us": {
            "size": "7",
            "value": 7,
            "exact": 7,
            "label": "US 7",
            "range": {
                "low": "6.75",
                "high": "7.25"
            }
        },
        "uk": {
            "size": "N½",
            "value": 13.5,
            "exact": 13.53,
            "label": "UK N½",
            "range": {
                "low": "N",
                "high": "O"
            }
        },
        "iso": {
            "size": "54",
            "value": 54,
            "exact": 54.41,
            "label": "ISO 54",
            "range": {
                "low": "54",
                "high": "55"
            }
        },
        "ch": {
            "size": "14",
            "value": 14,
            "exact": 14.41,
            "label": "CH/IT/ES 14",
            "range": {
                "low": "14",
                "high": "15"
            }
        },
        "jp": {
            "size": "14",
            "value": 14,
            "exact": 14.41,
            "label": "JP 14",
            "range": {
                "low": "14",
                "high": "15"
            }
        },
        "diameter": {
            "size": "17.3",
            "value": 17.3,
            "exact": 17.32,
            "label": "17.3 mm diameter",
            "range": {
                "low": "17.1",
                "high": "17.5"
            }
        }
    },
    "basis": {
        "us": "US/Canada/Mexico: inside diameter = 11.63 + 0.8128 × size mm (0.032 in per whole size); circumference = π × diameter.",
        "uk": "UK/Ireland/Australia/NZ: letters A-Z then Z+1..., 1.25 mm of inside circumference per letter, C = 40 mm (BS 6820:1987), half letters at 0.625 mm.",
        "iso": "ISO 8653 (France, Belgium, Nordic and most of continental Europe): the inside circumference in mm.",
        "ch": "Switzerland, Italy, Spain: inside circumference in mm − 40.",
        "jp": "Japan (also used loosely in China and Korea): about circumference − 40 mm, 1 mm per size. Approximate: no published linear rule; makers' tables differ by about one size.",
        "diameter": "Inside diameter = circumference / π (Germany and the Netherlands label rings this way)."
    },
    "notes": [],
    "variance": {
        "sizes": 0.25,
        "note": "Jewellers' sizers differ by about a quarter US size (half a UK letter). \"range\" shows the labels within that.",
        "details": [
            "Wide bands (6 mm or more) fit tighter: many people go up a quarter to half size.",
            "Fingers are larger in the heat and late in the day; measure the finger more than once.",
            "Japanese sizes are approximate (no published linear rule); makers' tables differ by about one size."
        ]
    },
    "disclaimer": "Sizes vary by brand, style and country of manufacture. These conversions come from public sizing formulas and body-measurement rules, not from any brand's chart: treat them as a starting point and check the brand's own size chart and measurements before buying, selling or listing."
}
Convert a ring size — CODE SNIPPETS

curl --location --request GET 'https://zylalabs.com/api/14590/size+chart+converter+api/37389/convert+a+ring+size?size=7&from=us' --header 'Authorization: Bearer YOUR_API_KEY' 


    
Request
Through head circumference in cm. US fitted = head circumference (in) / π, in eighths; UK = US − 1/8; EU = whole cm; letters are our own 2 cm bands (M = 57-58 cm). Between sizes, take the larger.
Endpoint ID: 37390
GET https://zylalabs.com/api/14590/size+chart+converter+api/37390/convert+a+hat+size
INPUT PARAMETERS

Convert a hat size — Endpoint Features

Object Description
size Required The size as written on the label or chart. Numbers take decimals, commas or fractions ("9.5", "9,5", "9½", "9 1/2", "7⅛", or a letter like "M").
from Required The hat size system: us, uk, eu (cm label), cm or in (measured head), letter.

Free test requests remaining: 3 of 3.


INPUT PARAMETERS

size
from
API EXAMPLE RESPONSE
JSON
{
    "category": "hat",
    "input": {
        "size": "7 1/8",
        "system": "us",
        "read": 7.125,
        "label": "US 7 1/8"
    },
    "headCircumference": {
        "cm": 56.9,
        "in": 22.38
    },
    "sizes": {
        "us": {
            "size": "7 1/8",
            "value": 7.125,
            "exact": 7.13,
            "label": "US 7 1/8",
            "range": {
                "low": "7",
                "high": "7 1/4"
            }
        },
        "uk": {
            "size": "7",
            "value": 7,
            "exact": 7,
            "label": "UK 7",
            "range": {
                "low": "6 7/8",
                "high": "7 1/8"
            }
        },
        "eu": {
            "size": "57",
            "value": 57,
            "exact": 56.85,
            "label": "57 cm",
            "range": {
                "low": "56",
                "high": "58"
            }
        },
        "in": {
            "size": "22 3/8",
            "value": 22.375,
            "exact": 22.38,
            "label": "22 3/8 in",
            "range": {
                "low": "22 1/8",
                "high": "22 3/4"
            }
        },
        "letter": {
            "size": "M",
            "value": 3,
            "exact": 56.85,
            "label": "M",
            "band": {
                "from": 56.5,
                "to": 58.5,
                "unit": "cm"
            },
            "range": {
                "low": "S",
                "high": "M"
            }
        }
    },
    "basis": {
        "us": "US fitted hat size = head circumference (in) / π (the head's diameter in inches), in eighths; about circumference (cm) / 8.",
        "uk": "UK fitted hat size = US size − 1/8.",
        "eu": "Metric (EU) hat size = head circumference in whole cm.",
        "in": "Head circumference in inches, to the nearest 1/8.",
        "letter": "Our own 2 cm letter bands: S 55-56 cm, M 57-58, L 59-60, XL 61-62 (makers differ by up to a band; adjustable caps often span two)."
    },
    "notes": [
        "Between two sizes, take the larger one (a hat band can be padded smaller, not stretched much larger)."
    ],
    "variance": {
        "sizes": 0.125,
        "note": "One eighth (about 1 cm of head circumference) either way between makers. Letter sizes vary the most.",
        "details": [
            "Measure around the head about 1 cm above the ears and eyebrows.",
            "Letter sizes (S, M, L) are our own 2 cm bands; makers' bands differ by up to one band and adjustable caps often cover two."
        ]
    },
    "disclaimer": "Sizes vary by brand, style and country of manufacture. These conversions come from public sizing formulas and body-measurement rules, not from any brand's chart: treat them as a starting point and check the brand's own size chart and measurements before buying, selling or listing."
}
Convert a hat size — CODE SNIPPETS

curl --location --request GET 'https://zylalabs.com/api/14590/size+chart+converter+api/37390/convert+a+hat+size?size=7 1/8&from=us' --header 'Authorization: Bearer YOUR_API_KEY' 


    
Request
type=women (dresses, tops, coats; by bust): US = bust (in) − 28, UK/AU = bust (in) − 24, FR = bust (cm)/2 − 4, DE = bust/2 − 6, IT = bust/2, JP odd sizes by JIS L 4005 bust steps, letters by bust band. type=men-suits (by chest): US/UK = chest (in), EU = chest (cm)/2. type=men-shirts (by neck): US/UK = collar in inches, EU/JP = collar in cm. Measurements are inputs too (bust-cm, chest-in, neck-cm...). The variance band is one size each way: many brands cut larger than the measurement rule (vanity sizing).
Endpoint ID: 37391
GET https://zylalabs.com/api/14590/size+chart+converter+api/37391/convert+a+clothing+size
INPUT PARAMETERS

Convert a clothing size — Endpoint Features

Object Description
type Required women, men-suits or men-shirts.
size Required The size as written on the label or chart. Numbers take decimals, commas or fractions ("9.5", "9,5", "9½", "9 1/2", or a letter like "M").
from Required women: us, uk, au, fr, eu (= fr), es, be, de, at, nl, it, jp, letter, bust-cm, bust-in. men-suits: us, uk, eu, de, fr, it, letter, chest-cm, chest-in. men-shirts: us, uk, eu, jp, letter, neck-cm, neck-in.

Free test requests remaining: 3 of 3.


INPUT PARAMETERS

type
size
from
API EXAMPLE RESPONSE
JSON
{
    "category": "clothing",
    "type": "women",
    "input": {
        "size": "8",
        "system": "us",
        "read": 8,
        "label": "US 8"
    },
    "body": {
        "bust": {
            "cm": 91.4,
            "in": 36
        }
    },
    "sizes": {
        "us": {
            "size": "8",
            "value": 8,
            "exact": 8,
            "label": "US 8",
            "range": {
                "low": "6",
                "high": "10"
            }
        },
        "uk": {
            "size": "12",
            "value": 12,
            "exact": 12,
            "label": "UK 12",
            "range": {
                "low": "10",
                "high": "14"
            }
        },
        "fr": {
            "size": "42",
            "value": 42,
            "exact": 41.72,
            "label": "FR 42",
            "range": {
                "low": "40",
                "high": "44"
            }
        },
        "de": {
            "size": "40",
            "value": 40,
            "exact": 39.72,
            "label": "DE 40",
            "range": {
                "low": "38",
                "high": "42"
            }
        },
        "it": {
            "size": "46",
            "value": 46,
            "exact": 45.72,
            "label": "IT 46",
            "range": {
                "low": "44",
                "high": "48"
            }
        },
        "jp": {
            "size": "15",
            "value": 15,
            "exact": 14.63,
            "label": "JP 15",
            "range": {
                "low": "11",
                "high": "17"
            }
        },
        "letter": {
            "size": "M",
            "value": 3,
            "exact": 91.44,
            "label": "M",
            "band": {
                "from": 90,
                "to": 98,
                "unit": "cm"
            },
            "range": {
                "low": "S",
                "high": "M"
            }
        }
    },
    "basis": {
        "us": "US misses = bust (in) − 28 (US 8 = 36 in bust).",
        "uk": "UK and Australia/NZ = bust (in) − 24 (UK 12 = 36 in bust).",
        "fr": "France (also Belgium, Spain) = bust (cm) / 2 − 4.",
        "de": "Germany (also Austria, Netherlands, Scandinavia) = bust (cm) / 2 − 6.",
        "it": "Italy = bust (cm) / 2.",
        "jp": "Japan JIS L 4005 odd sizes by bust: 3 = 74 cm, 3 cm per size up to 15 = 92 cm, then 4 cm per size.",
        "letter": "Our own bust bands (cm) following the German size groups: XS = DE 32-34, S = 36-38, M = 40-42, L = 44-46, XL = 48-50, XXL = 52-54."
    },
    "notes": [],
    "variance": {
        "sizes": 1,
        "note": "Expect one size either way between brands for the same body (vanity sizing). Compare the bust, waist and hip figures on the brand's chart.",
        "details": [
            "Many US and UK brands now cut a size or two larger than the measurement rule (vanity sizing), so retail charts often pair US 8 with FR 40 / DE 38 / IT 44 where the rule gives one size up; \"range\" includes both.",
            "This converts by bust; for trousers and skirts the waist and hip decide, and they vary even more between brands.",
            "Japanese sizes also carry body shape and height letters (Y, A, AB, B; PP, P, R, T) that this conversion ignores."
        ]
    },
    "disclaimer": "Sizes vary by brand, style and country of manufacture. These conversions come from public sizing formulas and body-measurement rules, not from any brand's chart: treat them as a starting point and check the brand's own size chart and measurements before buying, selling or listing."
}
Convert a clothing size — CODE SNIPPETS

curl --location --request GET 'https://zylalabs.com/api/14590/size+chart+converter+api/37391/convert+a+clothing+size?type=women&size=8&from=us' --header 'Authorization: Bearer YOUR_API_KEY' 


    
Request
Every label of one system with its nearest size in every other system and the measurement: for size pickers, listing forms and printed charts (example shortened to US 6-8).
Endpoint ID: 37392
GET https://zylalabs.com/api/14590/size+chart+converter+api/37392/a+whole+compiled+chart
INPUT PARAMETERS

A whole compiled chart — Endpoint Features

Object Description
category Required shoe, ring, hat or clothing.
from Required The system whose labels make the rows.
group Optional Shoes: men, women or kids.
type Optional Clothing: women, men-suits or men-shirts.
womenScale Optional Shoes: common or fia.

Free test requests remaining: 3 of 3.


INPUT PARAMETERS

category
from
group
type
womenScale
API EXAMPLE RESPONSE
JSON
{
    "category": "ring",
    "from": "us",
    "count": 65,
    "rows": [
        {
            "size": "0",
            "label": "US 0",
            "sizes": {
                "us": "0",
                "uk": null,
                "iso": "37",
                "ch": null,
                "jp": null,
                "diameter": "11.6"
            },
            "circumferenceMm": 36.54
        },
        {
            "size": "0.25",
            "label": "US 0.25",
            "sizes": {
                "us": "0.25",
                "uk": null,
                "iso": "37",
                "ch": null,
                "jp": null,
                "diameter": "11.8"
            },
            "circumferenceMm": 37.18
        },
        {
            "size": "0.5",
            "label": "US 0.5",
            "sizes": {
                "us": "0.5",
                "uk": "A½",
                "iso": "38",
                "ch": null,
                "jp": null,
                "diameter": "12"
            },
            "circumferenceMm": 37.81
        },
        {
            "size": "0.75",
            "label": "US 0.75",
            "sizes": {
                "us": "0.75",
                "uk": "B",
                "iso": "38",
                "ch": null,
                "jp": null,
                "diameter": "12.2"
            },
            "circumferenceMm": 38.45
        },
        {
            "size": "1",
            "label": "US 1",
            "sizes": {
                "us": "1",
                "uk": "B½",
                "iso": "39",
                "ch": null,
                "jp": null,
                "diameter": "12.4"
            },
            "circumferenceMm": 39.09
        }
    ],
    "basis": {
        "us": "US/Canada/Mexico: inside diameter = 11.63 + 0.8128 × size mm (0.032 in per whole size); circumference = π × diameter.",
        "uk": "UK/Ireland/Australia/NZ: letters A-Z then Z+1..., 1.25 mm of inside circumference per letter, C = 40 mm (BS 6820:1987), half letters at 0.625 mm.",
        "iso": "ISO 8653 (France, Belgium, Nordic and most of continental Europe): the inside circumference in mm.",
        "ch": "Switzerland, Italy, Spain: inside circumference in mm − 40.",
        "jp": "Japan (also used loosely in China and Korea): about circumference − 40 mm, 1 mm per size. Approximate: no published linear rule; makers' tables differ by about one size.",
        "diameter": "Inside diameter = circumference / π (Germany and the Netherlands label rings this way)."
    },
    "notes": [
        "Each row is the nearest label in every system; see the single-size endpoints for exact values and ranges."
    ],
    "variance": {
        "sizes": 0.25,
        "note": "Jewellers' sizers differ by about a quarter US size (half a UK letter). \"range\" shows the labels within that.",
        "details": [
            "Wide bands (6 mm or more) fit tighter: many people go up a quarter to half size.",
            "Fingers are larger in the heat and late in the day; measure the finger more than once.",
            "Japanese sizes are approximate (no published linear rule); makers' tables differ by about one size."
        ]
    },
    "disclaimer": "Sizes vary by brand, style and country of manufacture. These conversions come from public sizing formulas and body-measurement rules, not from any brand's chart: treat them as a starting point and check the brand's own size chart and measurements before buying, selling or listing."
}
A whole compiled chart — CODE SNIPPETS

curl --location --request GET 'https://zylalabs.com/api/14590/size+chart+converter+api/37392/a+whole+compiled+chart?category=ring&from=us' --header 'Authorization: Bearer YOUR_API_KEY' 


    
Request
Supported categories, systems and aliases
Endpoint ID: 37393
GET https://zylalabs.com/api/14590/size+chart+converter+api/37393/supported+categories+systems+and+aliases
INPUT PARAMETERS

Free test requests remaining: 3 of 3.

This endpoint does not require any input parameters.

API EXAMPLE RESPONSE
JSON
{
    "categories": {
        "shoe": {
            "endpoint": "/shoe",
            "measure": "foot length (mm)",
            "groups": [
                "men",
                "women",
                "kids"
            ],
            "from": [
                "us",
                "us-men",
                "us-women",
                "uk",
                "eu",
                "jp",
                "kr",
                "cn",
                "mondopoint",
                "foot-cm",
                "foot-in"
            ],
            "womenScale": [
                "common",
                "fia"
            ],
            "answers": [
                "us",
                "usMen or usWomen",
                "uk",
                "eu",
                "jp",
                "kr",
                "cn",
                "mondopoint"
            ],
            "kidsSizes": "US and UK kids sizes 1-6.5 need a scale mark: C (children's, e.g. \"2C\") or Y (big kids/youth, e.g. \"2Y\"); 0-0.5 and 7-13.5 are read as children's."
        },
        "ring": {
            "endpoint": "/ring",
            "measure": "inside circumference (mm)",
            "from": [
                "us",
                "uk",
                "iso",
                "eu",
                "ch",
                "jp",
                "diameter",
                "circumference"
            ],
            "aliases": {
                "ca": "us",
                "mx": "us",
                "au": "uk",
                "ie": "uk",
                "nz": "uk",
                "za": "uk",
                "fr": "iso",
                "it": "ch",
                "es": "ch",
                "cn": "jp",
                "kr": "jp"
            },
            "answers": [
                "us",
                "uk",
                "iso",
                "ch",
                "jp",
                "diameter"
            ]
        },
        "hat": {
            "endpoint": "/hat",
            "measure": "head circumference (cm)",
            "from": [
                "us",
                "uk",
                "eu",
                "cm",
                "in",
                "letter"
            ],
            "answers": [
                "us",
                "uk",
                "eu",
                "in",
                "letter"
            ]
        },
        "clothing": {
            "endpoint": "/clothing",
            "types": {
                "women": {
                    "measure": "bust (cm)",
                    "from": [
                        "us",
                        "uk",
                        "fr",
                        "de",
                        "it",
                        "jp",
                        "letter",
                        "bust-cm",
                        "bust-in"
                    ],
                    "aliases": {
                        "au": "uk",
                        "nz": "uk",
                        "eu": "fr",
                        "es": "fr",
                        "be": "fr",
                        "at": "de",
                        "nl": "de"
                    },
                    "answers": [
                        "us",
                        "uk",
                        "fr",
                        "de",
                        "it",
                        "jp",
                        "letter"
                    ]
                },
                "men-suits": {
                    "measure": "chest (cm)",
                    "from": [
                        "us",
                        "eu",
                        "letter",
                        "chest-cm",
                        "chest-in"
                    ],
                    "aliases": {
                        "uk": "us",
                        "de": "eu",
                        "fr": "eu",
                        "it": "eu"
                    },
                    "answers": [
                        "us",
                        "eu",
                        "letter"
                    ]
                },
                "men-shirts": {
                    "measure": "neck (cm)",
                    "from": [
                        "us",
                        "eu",
                        "letter",
                        "neck-cm",
                        "neck-in"
                    ],
                    "aliases": {
                        "uk": "us",
                        "jp": "eu"
                    },
                    "answers": [
                        "us",
                        "eu",
                        "letter"
                    ]
                }
            }
        }
    },
    "disclaimer": "Sizes vary by brand, style and country of manufacture. These conversions come from public sizing formulas and body-measurement rules, not from any brand's chart: treat them as a starting point and check the brand's own size chart and measurements before buying, selling or listing."
}
Supported categories systems and aliases — CODE SNIPPETS

curl --location --request GET 'https://zylalabs.com/api/14590/size+chart+converter+api/37393/supported+categories+systems+and+aliases' --header 'Authorization: Bearer YOUR_API_KEY' 


    

API Access Key & Authentication

After signing up, every developer is assigned a personal API access key, a unique combination of letters and digits provided to access to our API endpoint. To authenticate with the Size Chart Converter API simply include your bearer token in the Authorization header.

Headers
Header Description
Authorization Required Should be Bearer access_key. See "Your API Access Key" above when you are subscribed.

No long-term commitment. Upgrade, downgrade, or cancel anytime.

Starts at
$10,000/Year


  • Custom Volume
  • Custom Rate Limit
  • Specialized Customer Support
  • Real-Time API Monitoring

Overview

Shoe, ring, hat and clothing sizes between US, UK, EU and Japan, with brand-variance ranges.

Size Chart Converter API FAQs

Each endpoint returns size conversion data for shoes, rings, hats, and clothing, including measurements in various units (mm, cm, in) and size labels across different systems (US, UK, EU, Japan).

Key fields include "category" (type of item), "input" (user's size and system), "sizes" (converted sizes in various systems), and "range" (size variance). Each field provides essential information for size conversions.

Parameters include "size" (the original size), "system" (the size system used), and for some endpoints, "type" (e.g., women, men). Users can specify these to customize their conversion requests.

The response is structured with a main category, input details, and a sizes object containing converted sizes for various systems. Each size entry includes the size, value, label, and range for clarity.

The data is derived from established sizing standards and formulas, such as ISO for rings and common sizing practices for clothing and footwear. This ensures consistency and reliability across conversions.

Typical use cases include e-commerce platforms needing size conversions for international customers, fashion retailers providing size guides, and applications helping users find their correct sizes across brands.

Users can utilize the returned data by referencing the "sizes" object to find equivalent sizes in different systems, ensuring accurate fit when purchasing items from various regions or brands.

Data accuracy is maintained through adherence to sizing standards and regular updates based on industry practices. The API also accounts for brand-variance ranges to reflect real-world sizing discrepancies.

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