Oven temperatures · gas mark guide
Gas Mark 9 in °C, fan and °F
Gas Mark 9 is 240°C in a conventional electric oven, 220°C in a fan oven and 475°F. It is a very hot oven, the usual setting for pizza and flatbreads, and the hottest setting on most gas ovens.
Chart checked against Delia Smith and Waitrose on .
Conventional oven
240°C
electric, no fan
Fan oven
220°C
20°C lower
Fahrenheit
475°F
exactly 246°C
Heat
Very hot
gas mark 9
Gas Mark 9 and the settings either side
Conventional and fan temperatures in °C, with °F for American recipes.
| Gas mark | Conventional | Fan | Fahrenheit | Heat |
|---|---|---|---|---|
| Gas 7 | 220°C | 200°C | 425°F | Hot |
| Gas 8 | 230°C | 210°C | 450°F | Very hot |
| Gas 9 | 240°C | 220°C | 475°F | Very hot |
Fan ovens
If your electric oven has a fan you cannot switch off, set it to 220°C instead of 240°C. Delia Smith's advice is to take 20°C off conventional temperatures, or check your oven's handbook, as some models run hotter than others.
Why the numbers are rounded
475°F is exactly 246.1°C. Recipe charts round it to 240°C because ovens are not accurate to a few degrees anyway. An oven thermometer is the best way to know what your oven is really doing.
Related conversions
- Gas mark 8 (230°C · 450°F)
- 240°C to gas mark (conventional and fan)
- 475°F to gas mark (US recipes)
Common questions
What is Gas Mark 9 in Celsius?
240°C in a conventional oven, or 220°C if your oven has a fan.
What is Gas Mark 9 in a fan oven?
220°C. Fan ovens cook faster because the fan moves hot air around the food, so set them about 20°C lower than a conventional oven.
What is Gas Mark 9 in Fahrenheit?
475°F. That is the figure American recipes use for a very hot oven.
What do you cook at Gas Mark 9?
Pizza and flatbreads, and the hottest setting on most gas ovens.
Sources and assumptions
- Conventional means an electric oven with the fan off. Fan settings are 20°C lower.
- Recipe charts round temperatures to the nearest 10°C or 25°F, so exact conversions differ by a few degrees.
- Delia Smith: oven temperatures and conversions (gas marks 1 to 9, fan ovens)
- Waitrose: conversion charts (gas marks ¼ and ½)
Ovens vary. An oven thermometer shows what yours is really doing.