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Oven Temperature Converter
Convert oven temperatures between °C, °F, British gas marks, fan ovens, and French thermostat settings, with a gas mark table showing the temperatures recipes print and the exact ones.
Oven Temperature Converter: Gas mark 1 is 275 °F and each mark adds 25 °F, with ½ at 250 °F and ¼ at 225 °F. Celsius is converted exactly, and the table also shows the rounded values recipes print, which can differ by a few degrees. A fan oven is set about 20 °C lower than a conventional one. Runs 100% locally in your browser with zero server file uploads.
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| Gas mark | °F | °C as printed | °C exact | Fan °C |
|---|---|---|---|---|
| ¼ | 225 | 110 | 107 | 90 |
| ½ | 250 | 120 | 121 | 100 |
| 1 | 275 | 140 | 135 | 120 |
| 2 | 300 | 150 | 149 | 130 |
| 3 | 325 | 170 | 163 | 150 |
| 4 | 350 | 180 | 177 | 160 |
| 5 | 375 | 190 | 191 | 170 |
| 6 | 400 | 200 | 204 | 180 |
| 7 | 425 | 220 | 218 | 200 |
| 8 | 450 | 230 | 232 | 210 |
| 9 | 475 | 240 | 246 | 220 |
| 10 | 500 | 260 | 260 | 240 |
A fan oven moves hot air around the food and cooks faster, so recipes written for a conventional oven are usually set about 20 °C lower. Gas marks are British; French recipes number oven settings differently, at about 30 °C a step, so thermostat 6 is 180 °C. Oven dials often run a little hot or cold; an oven thermometer shows the real temperature.
Gas marks
Gas marks are the settings on gas ovens in the UK and Ireland, and older British recipes give temperatures that way. Gas mark 1 is 275 °F and each mark adds 25 °F, so gas mark 4 is 350 °F and gas mark 9 is 475 °F; the half and quarter marks below 1 are 250 °F and 225 °F, for slow cooking and drying meringues.
Recipe books print rounded Celsius values beside the marks, and not always the same ones: gas mark 3, exactly 163 °C, appears as 160 °C in some books and 170 °C in others. The table shows both the printed and the exact values, so either can be recognised.
Fan ovens and real temperatures
A fan oven circulates hot air, which carries heat into the food faster, so a recipe written for a conventional oven is usually baked about 20 °C lower with the fan on. Many recent recipes give both temperatures; reduce only when the recipe gives the conventional one.
Oven dials can be off by several degrees, and the temperature also varies between shelves. An inexpensive oven thermometer shows what the oven really reaches. For other temperatures, the Fahrenheit to Celsius converter works to a decimal; for the turkey, the turkey cooking time calculator plans the roast.
How to use it
- Enter the temperature from the recipe and choose its unit: °C, fan °C, °F, or gas mark.
- Read the setting for a conventional oven, a fan oven, and the nearest gas mark.
- Use the table to look up any gas mark.
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Frequently asked questions
What is 180 °C in Fahrenheit?
180 °C is 356 °F, which recipes round to 350 °F, gas mark 4. In a fan oven the same recipe is usually baked at 160 °C.
How much lower should a fan oven be?
About 20 °C lower than the conventional temperature in the recipe, because the fan moves hot air around the food. Many recipes already give the fan temperature; check before reducing it twice.
What does gas mark 4 mean?
It is 350 °F on gas ovens in the UK and Ireland, about 177 °C, printed in recipes as 180 °C. Each mark up adds 25 °F.
Is a French thermostat the same as a gas mark?
No. French recipes number oven settings by a rule of thumb of 30 °C a step, so thermostat 6 is 180 °C, while British gas mark 6 is 400 °F, about 200 °C. Choose the right one in the converter.
Why do recipes give slightly different Celsius values?
They round. Gas mark 3 is exactly 163 °C but usually printed as 170 °C, and some books print 160 °C. Ovens vary by more than that, so an oven thermometer is the most reliable guide.
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