350 °F, the most common baking temperature, is 177 °C (gas mark 4); 400 °F is 204 °C (gas mark 6).
| Fahrenheit (°F) | Celsius (°C) | Gas mark | Oven heat |
|---|---|---|---|
| 200 | 93 | — | Warming |
| 225 | 107 | 1/4 | Very slow |
| 250 | 121 | 1/2 | Very slow |
| 275 | 135 | 1 | Slow |
| 300 | 149 | 2 | Slow |
| 325 | 163 | 3 | Moderately slow |
| 350 | 177 | 4 | Moderate |
| 375 | 191 | 5 | Moderately hot |
| 400 | 204 | 6 | Fairly hot |
| 425 | 218 | 7 | Hot |
| 450 | 232 | 8 | Very hot |
| 475 | 246 | 9 | Very hot |
| 500 | 260 | — | Extremely hot |
| 525 | 274 | — | Extremely hot |
| 550 | 288 | — | Extremely hot |
How it is computed
°C = (°F − 32) × 5/9, rounded to the degree. Gas mark 1 is 275 °F and each mark adds 25 °F up to mark 9 at 475 °F; marks ¼ and ½ sit at 225 °F and 250 °F.
FAQ
Why do recipes say 180 °C for 350 °F?+
Oven dials step in 10 °C, so the exact value is rounded to the nearest setting. The difference is well inside a home oven's own swing.
Should I lower the temperature for a fan oven?+
Usually yes, by about 20 °C (25 °F), because circulating air cooks faster. Check the recipe, since some already assume a fan oven.