Kitchen design
Oven Temperature Conversions: °C, Fan, Gas Mark and °F
A simple chart for converting between conventional and fan ovens, gas marks and Fahrenheit, and why your own oven might not match the dial.
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British recipes, including ours, usually give three temperatures: conventional, fan and gas mark. American recipes use Fahrenheit. This chart covers the common oven temperatures, rounded the way recipes round them.
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Conversion chart
| Conventional | Fan | Gas mark | °F | Description |
|---|---|---|---|---|
| 110°C | 90°C | ¼ | 225°F | Very cool |
| 120°C | 100°C | ½ | 250°F | Very cool |
| 140°C | 120°C | 1 | 275°F | Cool |
| 150°C | 130°C | 2 | 300°F | Cool |
| 160°C | 140°C | 3 | 325°F | Moderate |
| 180°C | 160°C | 4 | 350°F | Moderate |
| 190°C | 170°C | 5 | 375°F | Moderately hot |
| 200°C | 180°C | 6 | 400°F | Hot |
| 220°C | 200°C | 7 | 425°F | Hot |
| 230°C | 210°C | 8 | 450°F | Very hot |
| 240°C | 220°C | 9 | 475°F | Very hot |
The Food Standards Agency’s turkey guidance uses the same convention: 180°C, 160°C fan, 350°F or gas mark 4.
Fan ovens
A fan moves hot air around, so food cooks faster at the same setting. The usual rule is to set a fan oven about 20°C (68°F) lower than a conventional one. Some makers suggest a different adjustment, so check your oven’s manual.
Your oven may not match the dial
Many ovens run hotter or cooler than the dial says, and some have hot spots. If cakes always burn or roasts take longer than the recipe, put an oven thermometer in the middle of the oven and compare it with the dial after 20 minutes of heating.
Converting yourself
- °C to °F: multiply by 9, divide by 5, add 32.
- °F to °C: subtract 32, multiply by 5, divide by 9.
Recipes round the results to the nearest 10 degrees, which is why the chart does not always match the formula exactly.
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Frequently asked questions
What is 180°C in a fan oven?
About 160°C fan, which is gas mark 4 or 350°F.
How much lower should a fan oven be?
The usual rule is about 20°C (68°F) lower than a conventional oven. Check your oven’s manual, as some makers suggest a different adjustment.
What gas mark is 200°C?
Gas mark 6, which is 180°C fan or 400°F.
Sources
- Christmas food hygiene, Food Standards Agency (GOV.UK), 11 January 2018. Checked 25 October 2026.