Gas mark converter
Gas Mark 4 is 180 °C or 350 °F on the standard British oven table. Enter any mark from a quarter to nine, or a listed temperature with its scale, and get the matching Gas Mark, Celsius and Fahrenheit. Free in your browser.
- Free
- Runs in your browser
- No sign-up
- Your data stays on your device
Run — free
Worked example
- Gas mark
- 4
- Gas mark label
- Gas Mark 4
- Celsius
- 180
- Fahrenheit
- 350
- Source
- gas_mark
A gas mark converter turns the British oven scale used in UK and Commonwealth recipes into the Celsius or Fahrenheit numbers printed on modern oven dials—and the reverse when a metric or US recipe lists a temperature and your appliance only shows Gas Mark. Enter a gas mark from one-quarter through nine, or enter a temperature that sits on the standard table with an explicit unit; the tool returns the matching Gas Mark label, Celsius, Fahrenheit, a short formula note, and ordered lookup steps you can paste into tests or worksheets.
What British gas marks mean on an oven dial
Gas Mark is a discrete British oven scale, not a continuous temperature formula. Classic cookbooks and many UK appliance dials still label heat as Gas Mark one-quarter, one-half, then integer marks one through nine.
Each mark maps to a published pair of Celsius and Fahrenheit values on the standard table this converter locks in: Gas Mark four is one hundred eighty degrees Celsius and three hundred fifty degrees Fahrenheit, Gas Mark six is two hundred Celsius and four hundred Fahrenheit, and so on through Gas Mark nine at two hundred forty Celsius and four hundred seventy-five Fahrenheit. The low marks one-quarter and one-half cover very gentle drying and warming at one hundred ten and one hundred twenty Celsius respectively.
Because the steps are not evenly spaced in every historical source, this tool does not interpolate between marks or invent a linear slope; it only returns the eleven published rows. That choice matches how printed recipes quote whole marks and how exam-style kitchen tests expect a single correct triple of Gas Mark, Celsius, and Fahrenheit. When a recipe says Gas Mark five you should set one hundred ninety Celsius or three hundred seventy-five Fahrenheit, not a guessed mid-point.
Teachers, recipe importers, and automated graders can therefore assert exact numbers for every mark from one-quarter through nine, each with the same lookup shape and no hidden rounding until the shared twelve-decimal publish step used by other pure-parse kitchen tools.
Practical tips, limits, and related searches
Always prefer the gas mark printed in a British recipe when one is given; reverse-lookup only when your source lists Celsius or Fahrenheit and you need the matching mark for a Gas Mark dial. Prefer sending numbers rather than pre-formatted strings when you control the client; string temperatures are accepted only when they match a strict finite numeric pattern.
When teaching or writing tests, pair forward and reverse examples for the same mark—for example Gas Mark four yields one hundred eighty Celsius and three hundred fifty Fahrenheit, and one hundred eighty Celsius yields Gas Mark four—to prove the table is symmetric.
This landing targets people searching for a gas mark converter, Gas Mark to Celsius, Gas Mark to Fahrenheit, or British oven temperature chart online; it is not a general arbitrary-scale temperature converter for weather data, not a fan-assisted offset calculator, and not a Gas Mark ten or commercial deck-oven chart. Prefer this capability when you need the discrete UK oven table; if you only need continuous Celsius to Fahrenheit outside those eleven rows, use a general temperature unit converter instead.
What you can do with it
Adapt British recipes to Celsius ovens
Home cooks convert Gas Mark settings from UK cookbooks into °C so a modern electric oven dial matches Delia, Nigella, or BBC Good Food instructions.
Translate US sheet recipes onto a Gas Mark dial
Expats and flat-share kitchens reverse-lookup Fahrenheit or Celsius from American cookies and muffins into the matching Gas Mark for a British appliance.
FAQ
What is a gas mark on an oven?
Gas Mark is the traditional British oven heat scale. Marks run from ¼ and ½ through integers 1–9; each mark maps to a fixed pair of Celsius and Fahrenheit values on the standard UK table.
What is Gas Mark 4 in Celsius and Fahrenheit?
On the standard table used here, Gas Mark 4 is 180 °C and 350 °F—the everyday moderate oven setting for many cakes and bakes.
What happens if I enter an unknown gas mark?
The tool does not invent a nearest mark.
Can I convert from Celsius or Fahrenheit back to gas mark?
Yes. Send value with unit celsius or fahrenheit. The temperature must match a published table entry exactly; off-table values are rejected.
Is the gas mark 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/cook/gas-mark \
-H "Authorization: Bearer $KIT_KEY" \
-H "Content-Type: application/json" \
-d '{"gas_mark":"4"}'const res = await fetch("https://api.kit.forhosting.com/cook/gas-mark", {
method: "POST",
headers: {
"Authorization": `Bearer ${process.env.KIT_KEY}`,
"Content-Type": "application/json"
},
body: JSON.stringify({
"gas_mark": "4"
})
});
const { task_id } = await res.json();import os, requests
res = requests.post(
"https://api.kit.forhosting.com/cook/gas-mark",
headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
json={
"gas_mark": "4"
},
)
task_id = res.json()["task_id"]<?php
$res = file_get_contents("https://api.kit.forhosting.com/cook/gas-mark", false, stream_context_create([
"http" => [
"method" => "POST",
"header" => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
"content" => '{"gas_mark":"4"}',
],
]));
$task = json_decode($res, true);body := bytes.NewBufferString(`{"gas_mark":"4"}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/cook/gas-mark", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)Example request
{
"gas_mark": "4"
}Example response
{
"task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
"type": "cook.gas_mark",
"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.
Limits
max_abs | 1000000000000 |
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
Unknown gas marks such as eleven or free-form words like high are rejected with a clear invalid_input error instead of inventing a nearest step, so a typo never becomes a wrong bake.
How to call the API and what comes back
Gas mark tokens include plain digits one through nine, fractions one-fourth and one-half, decimals zero point two five and zero point five, unicode vulgar fractions, words quarter and half, and prefixed forms such as Gas Mark four. Send a JSON body with at least one of two sources: gas_mark (aliases mark, gm, gas) naming the British mark, or value (aliases temp, temperature, amount, n) as a finite oven temperature whose absolute value stays within one trillion. When you convert from a temperature, unit (aliases from, scale, from_unit) is required and must resolve to celsius or fahrenheit—tokens such as c, °C, centigrade, f, and °F are accepted. On success the response sets gas_mark to the canonical table id, gas_mark_label to a human Gas Mark string, celsius and fahrenheit to the published temperatures, source to gas_mark, celsius, or fahrenheit depending on which input drove the lookup, formula to a short table-lookup description, message to an English summary, and steps to an ordered array of lookup lines. When both gas_mark and value are supplied, gas_mark is the source of truth so redundant clients stay predictable. Failed validation—missing both sources, missing unit on a temperature call, non-finite numbers, values outside absolute limits, an unknown gas mark, an unknown unit, or a temperature that does not match any published table entry—returns invalid_input and is never charged. Pricing is a flat $0.002 per successful request with unit item and zero marginal unit price.
Practical tips, limits, and related searches
Keep absolute temperatures inside the published trillion limit so coercion stays finite in IEEE double precision on the Worker and in the browser. Failed tasks that return invalid_input do not consume prepaid balance, which keeps exploratory scripts cheap when you deliberately send an unknown mark such as eleven or an off-table temperature such as one hundred seventy-five Celsius to verify error handling. Round-trip checks are easy: convert a mark to Celsius, send that Celsius back with unit celsius, and confirm you recover the same gas_mark, and confirm that switching only the source field between gas_mark and value never changes the published triple for a table temperature.
Integration use cases
Deterministic fixtures for recipe apps
Developers generate golden Gas Mark ↔ °C ↔ °F triples for every table row, plus deliberate unknown-mark rejections, for unit tests and CI.