Convert Shoe Sizes

Overview

Shoe Size Converter turns the input into a length in centimetres, then derives every other system from that length with linear formulas. US, UK and Australian sizes step 0.847 cm per size from a gender-specific offset. For US sizing, men's sizes start from 21.5 cm, women's from 20.2 cm, unisex from 21 cm and children's from 9.5 cm; UK and Australian sizes use slightly higher offsets of 22.3, 21, 21.7 and 10.3 cm. An Australian input with `gender=child` falls back to the unisex offset.

The other systems ignore gender. EU size is centimetres divided by 0.667. Japanese size equals the centimetre value. Mexican size uses the 0.847 step from a 17.5 cm offset. Korean size is the length in millimetres, so `kr` is ten times `cm`.

`from` accepts `us`, `uk`, `eu`, `cm`, `jp`, `au`, `mx` or `kr`; `gender` accepts `men`, `women`, `unisex` or `child` and defaults to `unisex`. `size` is parsed as a decimal number. Every value in `conversions` is rounded to one decimal place and is not snapped to a half size, so a US men's 9 becomes UK 8.1 rather than 8 or 8.5. `input_region` is the source system in upper case, and `input_size` and `gender` echo what was used.

Because the formulas are linear, very small or very large inputs extrapolate rather than fail, which can produce sizes no manufacturer makes. On the Free plan `eu`, `cm` and `jp` are removed from `conversions`.

Live Test Convert Shoe Sizes Source →

Formula

One function covers the whole catalog: the first argument names the source, the next are its inputs, and the field after them says which single value lands in the cell. Formulas covers the grammar that applies to all of them.

=VERVE("shoesizeconverter", A2, B2, "input_size")

=VERVE.CALL("shoesizeconverter", A2, B2, "input_size")

A2 holds size, B2 holds from. Arguments go in that order — the same order as the table below.

With literal values

Nothing has to come from a cell — typed values work the same way.

=VERVE("shoesizeconverter", 9, "us", "input_size")

=VERVE.CALL("shoesizeconverter", 9, "us", "input_size")

Inputs

Required inputs are positional, in the order below, followed by the field. Everything else is passed as a "name", value pair after that — the same shape as SUMIFS. Premium inputs are accepted on every plan but only take effect on plans that include them.

Passing an option

=VERVE("shoesizeconverter", A2, B2, "input_size", "gender", "men")

=VERVE.CALL("shoesizeconverter", A2, B2, "input_size", "gender", "men")

What lands in your sheet

The field — the argument after the inputs — is what makes the formula resolve to one cell. Its value is a dot-path from the table below, so swapping it is how you pull a different value — one formula per column.

Seeing everything at once

Leave the field out and the formula returns the whole response instead: two columns, field name on the left and value on the right, spilling from the cell you typed in.

=VERVE("shoesizeconverter", A2, B2)

=VERVE.CALL("shoesizeconverter", A2, B2)

Response fields

Paths are relative to data. Each one is exactly what the field argument accepts, so swapping it is how you pull a different value into a cell. On a plan without a Premium field the cell reads #PREMIUM(field) rather than a value, so a locked field never looks like a real answer.

Filling a whole column

Both platforms make one batched call for a column rather than one request per cell, and both cost the same — 1 credit per row looked up. How you write it differs, because the two runtimes batch at different points.

=VERVE("shoesizeconverter", A2:A100, B2:B100, "input_size")

In Google Sheets, give the arguments ranges and the answers spill down from the cell you typed in. Custom functions there run synchronously and in isolation, so dragged cells cannot be coalesced — the range form is how a column becomes one call. The field is required here: a per-row two-column table has nowhere to spill. Use a full column per input (A2:A100, not A2) — a single-cell reference is read as row 1 only and the rest of the column comes back blank.

In Excel, type the formula once and fill down — no range form and none needed, because its runtime is asynchronous and the add-in coalesces the calls a fill produces into a single batched request. Do not hand VERVE.CALL a range: Excel flattens it into positional arguments, so A2:A100 arrives as a hundred separate arguments and the cell reads #ERR rather than filling.

Either way, column A holds your size values and the answers land beside them, one row each, blank rows skipped.

When a cell doesn't fill

A failed lookup returns readable text starting with #ERR rather than a spreadsheet error, because Excel cannot show a custom message on a real error — you would get a bare #VALUE! with no reason. The trade-off is that IFERROR() will not catch it; test with LEFT(cell, 4) = "#ERR" instead. Error handling covers the rest.

Before the formula works

The add-in reads the API key you saved once in the side panel — the key never goes in the formula, so a shared sheet does not leak it and a collaborator without access simply sees the last calculated values.

1. Install the add-in for Google Sheets or Excel.
2. Open the side panel and sign in, or paste a key from your dashboard.
3. Type the formula above into any cell.

Use cases

E-commerce

Help international customers find their correct shoe size when shopping from different countries

Travel Planning

Convert shoe sizes when shopping abroad or purchasing from international retailers

Size Charts

Generate comprehensive size charts for footwear products with multiple regional standards

Retail Apps

Integrate size conversion features into shopping apps to improve customer experience

Other ways to use Convert Shoe Sizes

Set up Convert Shoe Sizes on VerveSheets, or reach the same source a different way. Your VerveSheets account and credits work on all of them — one key, one balance.

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