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Oven temperatures: Fahrenheit to Celsius, gas marks and oven symbols

By 4 min read

Fahrenheit to Celsius for the oven, British gas marks, the symbols on an oven dial, and what changes with a fan oven.

350 °F is 177 °C, so set the oven to 175 °C. American recipes give the oven in Fahrenheit and older British recipes in gas marks. Here are both, rounded to the steps on a normal European oven dial, and what the symbols on the dial mean.

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Fahrenheit to Celsius

Fahrenheit Celsius, exact Set the oven to
225 °F 107 °C 110 °C
250 °F 121 °C 125 °C
275 °F 135 °C 135 °C
300 °F 149 °C 150 °C
325 °F 163 °C 165 °C
350 °F 177 °C 175 °C
375 °F 191 °C 190 °C
400 °F 204 °C 200 °C
425 °F 218 °C 220 °C
450 °F 232 °C 230 °C
475 °F 246 °C 250 °C
500 °F 260 °C 260 °C

The formula is °C = (°F – 32) × 5/9. For other values use the Fahrenheit to Celsius converter.

Celsius to Fahrenheit

Celsius Fahrenheit, exact Common in US recipes
150 °C 302 °F 300 °F
175 °C 347 °F 350 °F
200 °C 392 °F 400 °F
225 °C 437 °F 425 °F
250 °C 482 °F 475 °F

See the Celsius to Fahrenheit converter.

Gas marks

Gas mark is the scale on British gas ovens. Each step stands for a fixed Fahrenheit temperature. The Celsius column below is converted; British recipes often round a little differently, for example 170 °C for gas mark 3 and 180 °C for gas mark 4.

Gas mark Fahrenheit Celsius, converted
1/4 225 °F 107 °C
1/2 250 °F 121 °C
1 275 °F 135 °C
2 300 °F 149 °C
3 325 °F 163 °C
4 350 °F 177 °C
5 375 °F 191 °C
6 400 °F 204 °C
7 425 °F 218 °C
8 450 °F 232 °C
9 475 °F 246 °C

What do the oven symbols mean?

The symbols look almost the same on most ovens. The lines show where the heat comes from, and a fan means the air is blown around.

Symbol Function Use it for
A line at the top and one at the bottom Conventional, top and bottom heat What most recipes mean. Cakes, bread and bakes on one shelf.
A fan inside a ring Fan oven Several trays at once, biscuits and buns.
A line at the bottom Bottom heat Pies and pizzas that need a crisp base.
A fan and a line at the bottom Fan with bottom heat, often called pizza setting Pizza and pies.
A line at the top Top heat Browning the top at the end.
A zigzag line at the top Grill Browning and thin cuts of meat.
A zigzag line and a fan Fan grill Larger joints of meat and chicken.
A snowflake Defrost Thawing food without heat.

Manufacturers draw the symbols a little differently, and some ovens have their own programmes. Check the manual if a symbol is not listed here.

How much lower for a fan oven?

A recipe temperature usually assumes a conventional oven with top and bottom heat. A fan oven moves the heat around and bakes faster at the same setting, so most people lower the temperature by about 20 degrees. British recipes often give both, for example 180 °C or 160 °C fan. Ovens differ, so follow the manufacturer’s guidance and keep an eye on the first bake.

Is your oven right?

The thermostat in a home oven can be off. If bakes often come out too dark or too pale, check with an oven thermometer and adjust to it.

Frequently asked questions

What is 350 °F in Celsius?

350 °F is 177 °C. Set the oven to 175 °C.

What is 400 °F in Celsius?

400 °F is 204 °C. Set the oven to 200 °C.

What is 425 °F in Celsius?

425 °F is 218 °C. Set the oven to 220 °C.

What temperature is gas mark 4?

Gas mark 4 is 350 °F, which is 177 °C. British recipes often write 180 °C.

What does the fan oven symbol look like?

A fan inside a ring. A fan with a line at the bottom is fan with bottom heat.

Should I lower the temperature for a fan oven?

Usually, by about 20 degrees. British recipes often give 160 °C fan instead of 180 °C. Follow your oven’s own guidance.