Recipes use different oven scales: Fahrenheit in the US, Celsius in most of the world, fan settings for convection ovens and gas marks in the UK. This chart puts them side by side. The most common one: 350°F is 180°C, gas mark 4.
| Fahrenheit | Celsius | Fan oven (Celsius) | Gas mark | Description |
|---|---|---|---|---|
| 225°F | 110°C | 90°C | 1/4 | Very cool |
| 250°F | 120°C | 100°C | 1/2 | Very cool |
| 275°F | 140°C | 120°C | 1 | Cool |
| 300°F | 150°C | 130°C | 2 | Cool |
| 325°F | 160°C | 140°C | 3 | Moderate |
| 350°F | 180°C | 160°C | 4 | Moderate |
| 375°F | 190°C | 170°C | 5 | Moderately hot |
| 400°F | 200°C | 180°C | 6 | Hot |
| 425°F | 220°C | 200°C | 7 | Hot |
| 450°F | 230°C | 210°C | 8 | Very hot |
| 475°F | 240°C | 220°C | 9 | Very hot |
Oven dials are not precise, so recipe temperatures are rounded to the nearest common setting. The exact conversion of 350°F is 176.7°C, which is why 180°C is used. The fan column follows the usual rule of thumb of reducing a conventional temperature by 20°C.
350°F is about 177°C, normally rounded to 180°C (160°C in a fan oven, gas mark 4).
Subtract 32, multiply by 5, then divide by 9. For 400°F: 400 − 32 = 368, × 5 = 1840, ÷ 9 = 204°C, usually rounded to 200°C.
A fan oven circulates hot air, so food cooks faster and more evenly. Most recipes and oven makers suggest lowering the temperature by about 20°C (or 25°F), or following the fan temperature printed in the recipe if there is one.
180°C is gas mark 4, the same as 350°F. Gas mark 1 is 275°F (140°C) and gas mark 9 is 475°F (240°C).
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