Inch converter
12 inches is exactly 1 foot and 1 inch is 2.54 cm: one form that starts in inches and lets you pick feet, yards, centimetres, millimetres or metres for drawings, product sheets, sewing tapes and height charts. Free in your browser.
- Free
- Runs in your browser
- No sign-up
- Your data stays on your device
Run — free
Worked example
- Inches
- 12
- To
- Ft
- Result
- 1 ft
- Converted
- 1
- From
- in
- Factor
- 0.0833333333
An inch converter turns a length expressed in inches into feet, yards, centimetres, millimetres, or metres using the exact 1959 international-yard factors rather than rounded classroom shortcuts. Enter a finite length in inches, choose a supported target unit, and the tool converts through the inch as the hub: one foot is twelve inches, one yard is thirty-six inches, one inch is exactly two point five four centimetres, twenty-five point four millimetres, and zero point zero two five four metres.
Why inches are the right hub for this converter
The international inch is a defined length, not a rounded classroom guess. Since the 1959 yard and pound agreement among the United States, the United Kingdom, Canada, Australia, New Zealand, and South Africa, one inch equals exactly two point five four centimetres, which is the same as twenty-five point four millimetres or zero point zero two five four metres. Twelve of those inches make one international foot, and thirty-six make one international yard.
An inch converter that multiplies and divides by those exact factors is the right tool when a drawing, a product sheet, a sewing tape, or a height chart is already in inches and you need another everyday unit. It is a different search from inches to centimetres, inches to millimetres, or inches to feet, each of which is a one-way pair, and it is a different search from a giant length toolbox that also lists kilometres and miles.
People type inch converter when they want one form that starts in inches and lets them pick the target. Approximate mental rules such as two and a half centimetres per inch, or divide by twelve and hope, introduce a two-percent scale error that shows up immediately on a seventy-two-inch table or a ninety-six-inch sofa. Zero inches maps cleanly to zero in every supported unit.
Negative inches are accepted as signed deltas when a CAD change or a tolerance stack is signed. Identity conversion back to inches is allowed and returns the same magnitude after twelve-decimal rounding, which is useful when a pipeline always posts a target unit even if that unit is still inches.
Practical checks, related searches, and when not to use this page
Round-trip sanity checks are easy: convert twelve inches to feet and confirm you receive exactly one foot, then convert thirty-six inches to yards and confirm one yard. Convert one inch to centimetres and confirm two point five four, or convert one inch to millimetres and confirm twenty-five point four. A typical adult height of seventy-two inches should come back as six feet after integer division by twelve, which is a useful classroom check against a tape measure marked in feet and inches.
Stay inside the absolute range so the product cannot overflow into a non-finite result the solver must reject. This landing targets people searching for inch converter, convert inches, inches to feet, inches to centimeters, or inches to millimeters as an inch-centred tool with a chosen target. It is not a one-way inches-to-centimetres form that hides the other units, not a kilometres-and-miles travel converter, and not a lumber, shoe, belt, or screen-diagonal size chart.
Prefer this capability when the length is already in inches and you only need feet, yards, centimetres, millimetres, metres, or inches.
What you can do with it
Product and packaging dimension labels
Export inch warehouse measurements to foot, centimetre, or millimetre fields on product pages and packing slips with the same exact 12, 2.54, and 25.4 factors every row.
Height, sewing, and classroom checks
Convert a body height or fabric length in inches to feet or centimetres and compare hand work against deterministic steps before submitting a worksheet.
FAQ
How do I convert inches to feet with this tool?
Send inches as a finite number and to as ft.
How many centimetres are in one inch?
Exactly 2.54 cm under the 1959 international yard and pound agreement. Convert from inches with to as cm to see that constant in the result.
Which target units does the inch converter support?
Six units through an inch hub: in, ft (foot), yd (yard), cm (centimetre), mm (millimetre), and m (metre).
What happens if the target unit is unsupported?
Missing fields and non-finite inches fail the same way. Failed tasks are not charged.
Is the inch converter free?
The browser tool is free and runs locally.
Related tools
For developers — API access
Everything on this page is available programmatically. This section is for teams who want to wire it into their own systems; everyone else can just use the tool above.
API endpoint
Prefer to automate it? One authenticated POST creates the task; the result comes back by webhook or a signed link. The same capability also runs here on the web, by email and from Telegram — and soon from our app too.
Call it from your stack
curl -X POST https://api.kit.forhosting.com/conv/inch-converter \
-H "Authorization: Bearer $KIT_KEY" \
-H "Content-Type: application/json" \
-d '{"inches":12,"to":"ft"}'const res = await fetch("https://api.kit.forhosting.com/conv/inch-converter", {
method: "POST",
headers: {
"Authorization": `Bearer ${process.env.KIT_KEY}`,
"Content-Type": "application/json"
},
body: JSON.stringify({
"inches": 12,
"to": "ft"
})
});
const { task_id } = await res.json();import os, requests
res = requests.post(
"https://api.kit.forhosting.com/conv/inch-converter",
headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
json={
"inches": 12,
"to": "ft"
},
)
task_id = res.json()["task_id"]<?php
$res = file_get_contents("https://api.kit.forhosting.com/conv/inch-converter", false, stream_context_create([
"http" => [
"method" => "POST",
"header" => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
"content" => '{"inches":12,"to":"ft"}',
],
]));
$task = json_decode($res, true);body := bytes.NewBufferString(`{"inches":12,"to":"ft"}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/conv/inch-converter", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)Example request
{
"inches": 12,
"to": "ft"
}Example response
{
"task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
"type": "conv.inch_converter",
"status": "queued",
"_links": {
"result": "/tasks/tsk_…/result"
}
}The API is asynchronous: the call returns a task_id immediately and the result arrives by webhook. Polling is capped at 1 req/s per task.
Pricing
Published price — no tokens, no invented credits. A failed task is never charged.
Errors
| HTTP | Code | Meaning |
|---|---|---|
401 | unauthorized | Missing or invalid API key. |
402 | insufficient_balance | Your balance doesn't cover the task price. |
404 | unknown_type | That task type doesn't exist. |
429 | rate_limited | Too many requests. Use the webhook instead of polling. |
Technical notes
An unsupported target unit, or a missing or non-finite inch value, fails with a clear invalid_input error instead of inventing a number.
How to call the API and what comes back
Canonical unit tokens are in, ft, yd, cm, mm, and m. Absolute values must stay within the published limit. Send a JSON body with two required fields: inches, a finite number for the length in inches, and to, the target unit. Aliases such as value, length, amount, size, inch, to_unit, unit, target, feet, yards, centimeters, millimetres, and meters are accepted so SDK clients and form posts can use the name that fits the product. On success the response echoes the rounded inches, sets from to in, sets to to the canonical target token, sets result, converted, and unit to the converted length and its unit, factor to the rounded inches-to-target multiplier, cm_per_inch to two point five four, inches_per_foot to twelve, formula to the string that states result equals inches times factor of to, message to a short English summary, steps to an ordered array of substitution lines, and supported_units to the six tokens. Failed validation—missing fields, non-finite numbers, bare plus or minus signs, non-numeric strings, an unsupported target unit, values outside absolute limits, or a non-finite converted result—returns invalid_input and is never charged. Pricing is a flat $0.002 per successful request with unit item. Prefer bare numbers when you control the client; string numbers are accepted only when they match a strict finite numeric pattern without unit suffixes or thousand separators in the payload.
Practical checks, related searches, and when not to use this page
Failed tasks that return invalid_input do not consume prepaid balance, which keeps exploratory scripts cheap when learners deliberately omit inches or pass an unsupported unit name such as miles. Pin the rounded JSON in tests so browser and API arithmetic never drift across releases.
Integration use cases
Unit-test fixtures for length-aware software
Engineers pin golden JSON for inch-hub cases so browser and API arithmetic never drift when software talks in feet, yards, centimetres, millimetres, or metres.