Oven temperature converter
Fahrenheit, Celsius, gas mark and the fan-oven adjustment.
Roughly 20 °C lower
Oven temperature chart
| °F | °C | Fan °C | Gas | Description |
|---|---|---|---|---|
| 225 | 105 | 85 | ¼ | Very cool |
| 250 | 120 | 100 | ½ | Very cool |
| 275 | 135 | 115 | 1 | Cool |
| 300 | 150 | 130 | 2 | Cool |
| 325 | 165 | 145 | 3 | Warm |
| 350 | 175 | 155 | 4 | Moderate |
| 375 | 190 | 170 | 5 | Moderate |
| 400 | 205 | 185 | 6 | Moderately hot |
| 425 | 220 | 200 | 7 | Hot |
| 450 | 230 | 210 | 8 | Hot |
| 475 | 245 | 225 | 9 | Very hot |
| 500 | 260 | 240 | 10 | Very hot |
How it works
Oven conversions are just temperature conversions, with two wrinkles: gas marks, and fans.
°C = (°F − 32) × 5/9 gas mark = (°F − 275) ÷ 25 + 1 Gas marks
The UK gas mark scale starts at mark 1 = 275 °F and adds 25 °F per mark, with fractional marks ¼ and ½ below it for very slow cooking. It is a coarse scale on purpose — gas ovens swing far more than the numbers suggest.
Rounding is fine here
Recipes are written in round numbers because domestic ovens are routinely 10–15 °C off and cycle around their setpoint. 350 °F converts to 176.7 °C, but every European recipe writes 180. An oven thermometer tells you more than another decimal place ever will.
Altitude
Above about 3,000 ft, lower pressure means water boils cooler and leavening expands faster. The usual adjustment is to raise the oven by 15–25 °F and shorten the bake slightly, plus a little extra liquid.