Oven Temperature Converter
Celsius, Fahrenheit, gas mark and the fan-oven equivalent, all at once.
Results
What this tool does
Recipes arrive in whatever units their author grew up with, and an oven dial only speaks one of them. Gas marks follow a straight line — each mark is 25 °F, starting at mark 1 being 275 °F — so they convert exactly, even though only whole marks exist on a real cooker. The fan-oven figure is the conventional 20 °C reduction.
Formula
°F = °C x 9/5 + 32 ; gas mark = (°F - 250) / 25
Variables
| Symbol | Meaning | Unit |
|---|---|---|
cc | Oven temperature | °C |
FF | Temperature | °F |
GM | Gas mark | — |
FA | Fan oven | °C |
FB | Fan oven | °F |
Worked example
- Oven temperature180 °C
- Temperature356 °F
- Gas mark4.2
- Fan oven160 °C
- Fan oven320 °F
Limitations
- The default values are typical reference figures, not measurements of your situation. Replace them with your own data whenever you have it.
- US and imperial (UK) units with the same name are not the same size. Check which system your figures come from.
Frequently asked questions
Why subtract 20 °C for a fan oven?
Moving air carries heat to the food far more effectively than still air, so a fan oven cooks faster at the same dial setting. Twenty degrees is the conversion oven manufacturers and recipe writers have settled on, and it is what most British and Irish recipes assume when they print two numbers. Some ovens are closer to 15, so treat it as a starting point and watch the first bake.