Celsius, Fahrenheit and gas mark, plus the fan adjustment most recipes forget to mention. Type any one figure and the rest follow.
| Gas | °C | °F | Description |
|---|---|---|---|
| 1 | 140 | 275 | Very slow |
| 2 | 150 | 300 | Slow |
| 3 | 170 | 325 | Moderate-slow |
| 4 | 180 | 350 | Moderate |
| 5 | 190 | 375 | Moderate-hot |
| 6 | 200 | 400 | Hot |
| 7 | 220 | 425 | Hot |
| 8 | 230 | 450 | Very hot |
| 9 | 240 | 475 | Very hot |
Fan (convection) ovens run hotter for the same dial, so the rule of thumb is to set a fan oven about 20°C below the conventional temperature a recipe gives, or drop the time a little instead. Gas mark maps to the nearest common Celsius step, so conversions round to sensible oven numbers rather than exact maths. Ovens also lie: an oven thermometer is the cheap fix if your baking is always over or under.
What is gas mark 4 in degrees C?
Gas mark 4 is 180°C conventional, 160°C fan and 350°F. It is the general baking temperature for sponges, cookies and most everyday oven work.
What is 220 Celsius in gas mark?
220°C conventional is gas mark 7 (200°C fan, 425°F), a hot setting for roast potatoes, pizza and crisping.
How do you convert an oven temperature for a fan oven?
Drop about 20°C from the conventional figure. The full table and the reasoning are in the oven temperature conversions reference.