Oven temperatures · gas mark guide
250°F to gas mark and °C
250°F is gas mark ½. In a UK electric oven that is 120°C, or 100°C with the fan on. The exact conversion is 121.1°C, which recipe charts round to 120°C.
Chart checked against Delia Smith and Waitrose on .
Gas mark
½
on the chart
Conventional oven
120°C
as recipe charts round it
Fan oven
100°C
20°C lower
Exact
121.1°C
(°F − 32) × 5 ÷ 9
Gas mark conversion chart
The row nearest to 250°F is gas mark ½.
| Gas mark | Conventional | Fan | Fahrenheit | Heat |
|---|---|---|---|---|
| Gas ¼ | 110°C | 90°C | 225°F | Very cool |
| Gas ½ | 120°C | 100°C | 250°F | Very cool |
| Gas 1 | 140°C | 120°C | 275°F | Very low |
| Gas 2 | 150°C | 130°C | 300°F | Very low |
| Gas 3 | 170°C | 150°C | 325°F | Low |
| Gas 4 | 180°C | 160°C | 350°F | Moderate |
| Gas 5 | 190°C | 170°C | 375°F | Moderately hot |
| Gas 6 | 200°C | 180°C | 400°F | Hot |
| Gas 7 | 220°C | 200°C | 425°F | Hot |
| Gas 8 | 230°C | 210°C | 450°F | Very hot |
| Gas 9 | 240°C | 220°C | 475°F | Very hot |
American recipes and fan ovens
US recipes give conventional oven temperatures in Fahrenheit. In a UK fan oven, convert 250°F to 120°C first, then take off 20°C to get 100°C.
What cooks at 250°F
American recipes use 250°F for meringues, pavlova bases and very slow cooking, and on a gas oven that means gas mark ½. The settings either side are gas mark ¼ (110°C, 225°F) and gas mark 1 (140°C, 275°F).
Other temperatures
- 225°F to gas mark (gas ¼)
- 275°F to gas mark (gas 1)
- 300°F to gas mark (gas 2)
- 325°F to gas mark (gas 3)
gas mark ½ in full · Full gas mark conversion chart · Convert any temperature
Common questions
What gas mark is 250°F?
Gas mark ½.
What is 250°F in Celsius?
121.1°C exactly, which recipe charts round to 120°C.
What is 250°F in a fan oven?
100°C. Convert to Celsius, then take 20°C off for the fan.
Sources and assumptions
- Conventional means an electric oven with the fan off. Fan settings are 20°C lower.
- Recipe charts round temperatures to the nearest 10°C or 25°F, so exact conversions differ by a few degrees.
- Delia Smith: oven temperatures and conversions (gas marks 1 to 9, fan ovens)
- Waitrose: conversion charts (gas marks ¼ and ½)
Ovens vary. An oven thermometer shows what yours is really doing.