Oven Temperature Converter
Convert oven temperatures between Celsius, Fahrenheit, and Gas Mark, plus the fan (convection) setting. Enter any one and get the rest instantly. Calculates in your browser.
Fahrenheit
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Show the math
Celsius and Fahrenheit relate linearly, and Gas Mark steps by 25°F:
°F = °C × 9⁄5 + 32
Gas Mark 1 = 275°F, each mark +25°F
Below Gas Mark 1 the marks halve instead: Gas ½ is 250°F and Gas ¼ is 225°F.
Fan (convection) ovens cook faster, so a common rule is to set them about 20°C lower than a conventional recipe temperature; US makers usually say 25°F lower. Gas Mark is rounded to the nearest setting from ¼ to 9.
What this does
An oven temperature converter switches between Celsius, Fahrenheit, and Gas Mark, plus the fan (convection) setting, enter any one and get the rest.
How to use it
- Enter a temperature in any scale.
- Read the equivalents instantly.
- Check the Gas Mark and fan setting.
- Use the fan value for a convection oven.
How it works
Gas Mark 1 is 275°F and each mark adds 25°F; below it the marks halve, so Gas ½ is 250°F and Gas ¼ is 225°F. A fan oven is usually set about 20°C lower than a conventional recipe, since moving air cooks faster.
°F = °C × 9⁄5 + 32
Example
180°C is 356°F, about Gas Mark 4, or 160°C fan.
Sources & methodology
- AEG, What do the gas mark numbers mean / relate to temperatures?, Gas marks ¼ to 10 in °F and °C
Last updated .
Frequently asked questions
How do Celsius and Fahrenheit relate?
They convert linearly: °F = °C × 9⁄5 + 32. So 180°C is 356°F and 200°C is 392°F.
What is Gas Mark?
It is the dial scale on gas ovens. Gas Mark 1 is 275°F and each mark adds 25°F, so Gas Mark 4 is 350°F (about 180°C). Below Gas 1 come Gas ½ (250°F) and Gas ¼ (225°F). The tool rounds to the nearest mark from ¼ to 9.
How much lower should a fan oven be?
A common rule is to set a fan (convection) oven about 20°C lower than a conventional recipe temperature, because moving air cooks food faster. US makers usually say 25°F lower, and many convection ovens make that change for you, so check your oven’s manual.
Is my data stored?
No. Everything is calculated locally in your browser.
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