A common European setting
Input 180 °C
Result 356 °F, Gas Mark 4, and 160 °C in a fan oven.
Oven Temperature Converter
Home & RenovationTurn any oven setting into Celsius, Fahrenheit, Gas Mark and fan oven degrees, so British, European and American recipes match.
Your inputs
Result
Celsius
—
°C
- Fahrenheit — °F
- Gas Mark —
- Fan oven — °C
- Heat level —
Change any input and the result updates instantly.
Formula and rules
- Gas Mark n = 250 + 25n degrees Fahrenheit, so Gas 4 is 350 °F.
- Celsius = (Fahrenheit − 32) × 5 ÷ 9, so Gas 4 at 350 °F is 177 °C.
- Going the other way, Gas Mark = ((Celsius × 9 ÷ 5 + 32) − 250) ÷ 25, rounded to the nearest mark.
- A fan oven runs about 20 °C cooler than a conventional one, so subtract 20 °C for a fan setting.
- Gas marks run from 1 (very low, 275 °F) to 9 (very hot, 475 °F); most British recipes stay between 3 and 7.
Worked examples
A British recipe
Input Gas 6
Result 204 °C, 400 °F, and 184 °C for a fan oven.
An American recipe
Input 350 °F
Result 177 °C, Gas Mark 4, or 157 °C with a fan.
FAQ
Why does a fan oven need a lower setting?
A fan pushes hot air around the cavity, so heat reaches the food faster and more evenly than in a conventional oven. Most recipes therefore drop by about 20 °C, or 25 °F, when a fan is used.
Is Gas Mark still used outside the UK?
Gas Mark is mainly a British and Irish convention, and it survives mostly in older ovens and in recipes written before fan ovens became standard. Mainland Europe uses Celsius and the United States uses Fahrenheit.
What is Gas Mark 4 in Celsius?
Gas Mark 4 is 350 °F, which is 177 °C and is often rounded to 180 °C in European recipes. In a fan oven the equivalent setting is about 160 °C.
Disclaimer: Results follow the formula shown on this page and are for reference only. Real-world quantities vary with materials, technique and conditions, so allow a margin before ordering.