The Oven Temperature Converter switches a recipe’s oven temperature between Fahrenheit, conventional Celsius, fan/convection Celsius and UK gas marks — so a US recipe in °F, a European one in °C and a British one in gas marks all become usable on your oven.
When you need this converter
The most common situation: you are following a British recipe that specifies “Gas Mark 4” or “180°C” and your oven dial shows only Fahrenheit, or vice versa. A second common case: the recipe says 200°C conventional but you have a fan oven — and forgetting the fan adjustment is one of the most reliable ways to over-bake a cake.
Conversions it covers
- °C ↔ °F:
°F = (°C × 9/5) + 32 - Conventional → fan: subtract approximately 20°C (fan ovens circulate hot air, so food cooks faster and you reduce the temperature to compensate)
- °C → gas mark: mapped to the conventional Regulo scale used on British and Irish gas ovens
Quick reference
| Conventional °C | Fahrenheit | Fan °C | Gas mark | Typical use |
|---|---|---|---|---|
| 150 | 300 | 130 | 2 | Slow-cook meringues, long braises |
| 180 | 356 | 160 | 4 | Cakes, biscuits, moderate roasting |
| 200 | 392 | 180 | 6 | Roast vegetables, bread rolls, pastry |
| 220 | 428 | 200 | 7 | Pizza, high-heat roasting |
| 240 | 464 | 220 | 9 | Very hot — bread crusts, searing |
Why ovens vary
Gas mark numbers come from the Regulo scale, originally calibrated so that each mark raises the oven temperature by roughly 25°F (around 14°C). The conversion is a lookup rather than a formula because the steps are not perfectly uniform across the full scale. Additionally, ovens have genuine thermostat variation — a domestic oven may be 10-15°C off its dial setting in either direction. Many experienced bakers use an oven thermometer rather than relying on the display.
The fan (convection) adjustment of roughly 20°C is a practical guideline, not a fixed law. Some fan ovens run less aggressively and may need only a 10°C reduction; consult your appliance manual for the manufacturer’s recommendation.
Always check your appliance manual, since ovens vary. Everything is converted locally in your browser — nothing is uploaded.