Baking · temperature

Oven temperature converter

Convert between Celsius, Fahrenheit, gas mark and fan — with the −20°C fan rule applied for you and honest notes on oven variance.

Oven temperature

Conversion
Celsius180°C
Fahrenheit356°F
Gas mark4
Fan / convection160°C
Fan (°F)320°F

Oven temperature conversions

Celsius to Fahrenheit is a direct formula; gas marks and fan settings are conventions.

°F = °C × 9/5 + 32  ·  fan ≈ conventional − 20°C
Gas mark°C°F
¼110225
½120250
1140275
2150300
3160325
4180350
5190375
6200400
7220425
8230450
9240475

Fan (convection) ovens circulate air and run effectively hotter, so the usual guidance is to set them about 20 °C (35 °F) below a conventional recipe, or cut the time by 10–15%. Gas marks don't map to perfectly round Celsius values, and ovens vary — an oven thermometer is the only way to know your true temperature.

What is gas mark 4 in Celsius?
Gas mark 4 is about 180°C (350°F), the most common moderate baking temperature.
How do I convert a recipe for a fan oven?
Set the fan oven about 20°C (35°F) lower than the conventional temperature, or reduce the cooking time by 10–15%.
Why don't gas marks match round Celsius numbers?
Gas marks were defined on the Fahrenheit scale, so they convert to slightly irregular Celsius values. Ovens also vary, so use an oven thermometer for accuracy.

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