How to use
Enter a temperature and choose the scale — Celsius, Fahrenheit or gas mark. You’ll see the temperature in every scale plus the setting for a convection or fan oven. Enter gas mark ¼ or ½ as 0.25 or 0.5.
Formulas
°F = °C × 9/5 + 32°C = (°F − 32) × 5/9- Gas marks are a British scale: gas mark 1 is 275 °F (about 140 °C), each step is 25 °F hotter, and gas mark 9 is 475 °F (about 240 °C).
Examples
- 350 °F = 177 °C, gas mark 4; on convection, about 325 °F.
- 180 °C (common in European recipes) = 356 °F — set your oven to 350 °F.
- Gas mark 6 = 400 °F (about 200 °C).
Convection and fan ovens
A fan blows hot air around the food, so it cooks faster. The usual rule is to lower the temperature by 25 °F (in European recipes, by 20 °C) or to check for doneness earlier. If a recipe already says “convection” or “fan”, don’t adjust it.
FAQ
Why do recipes say 180 °C instead of 177 °C? Recipes and oven dials round to the nearest 5–10 degrees; a few degrees don’t change the result.
Why do gas mark charts disagree slightly? Sources round the Celsius values differently — gas mark 9 appears as both 240 °C and 245 °C.
Changing pans too? Try the cake pan converter.