Oven Temperature Converter

Convert oven temperatures between Fahrenheit, Celsius, and Gas Mark with fan/convection adjustments and common baking temperature presets.

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Oven temperature converter Convert between Fahrenheit, Celsius, and Gas Mark for oven temperatures, with fan/convection oven adjustments.

Common presets

Gas mark reference

Gas Mark°F°C
1275135
2300149
3325163
4350177
5375191
6400204
7425218
8450232
9475246
10500260
Enter a temperature Provide an oven temperature and select a unit to convert between Fahrenheit, Celsius, and Gas Mark.

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Oven temperature converter: Fahrenheit, Celsius, and Gas Mark

Convert oven temperatures between Fahrenheit, Celsius, and Gas Mark instantly. Every oven dial and recipe book uses a different scale — enter a temperature in any unit and get the equivalent in all three, plus the recommended fan/convection oven adjustment. The converter includes a full Gas Mark reference table and common baking temperature presets for quick lookup.

How oven temperature conversion works

Fahrenheit and Celsius are related by a linear formula: °C = (°F − 32) × 5/9. Gas Mark is a stepped scale used mainly in the UK and some Commonwealth countries, where each integer mark corresponds to a specific temperature. Gas Mark 1 equals 275 °F (135 °C) and each subsequent mark adds approximately 25 °F (14 °C), up to Gas Mark 10 at 500 °F (260 °C).

Fan-assisted or convection ovens circulate hot air with a fan, cooking food more evenly and efficiently. The standard rule is to reduce the conventional temperature by 25 °F (approximately 14 °C) when using a fan oven. This adjustment is built into the converter so you can see both conventional and fan equivalents at a glance.

°C = (°F − 32) × 5 ÷ 9

Standard Fahrenheit to Celsius conversion.

°F = °C × 9 ÷ 5 + 32

Standard Celsius to Fahrenheit conversion.

Fan temperature = Conventional temperature − 25 °F (≈ 14 °C)

Reduce the set temperature for fan-assisted or convection ovens.

Gas Mark scale explained

The Gas Mark scale was introduced for gas ovens in the UK and remains common in British and Australian cookbooks. Each mark from 1 to 10 maps to a fixed conventional temperature: GM 1 = 275 °F / 135 °C (very slow), GM 4 = 350 °F / 177 °C (moderate), GM 6 = 400 °F / 204 °C (hot), and GM 9 = 475 °F / 246 °C (very hot).

Half marks (such as GM ¼ or GM ½) exist on some older ovens but are rarely called for in modern recipes. This converter supports whole Gas Mark values from 1 to 10, which covers the full practical baking and roasting range.

Common baking temperatures and when to use them

Slow (300 °F / 149 °C / GM 2): ideal for slow-roasting meats, drying fruit, and baking meringues. Moderate (350 °F / 177 °C / GM 4): the standard temperature for cakes, cookies, casseroles, and most general baking. Hot (400 °F / 204 °C / GM 6): used for roasting vegetables, baking bread, and pizza in a home oven. Very hot (450 °F / 232 °C / GM 8): for searing roasts, making flatbreads, and achieving crisp crusts.

Oven thermometers are strongly recommended regardless of what the dial says. Home ovens can deviate by 25–50 °F from their set temperature, which can significantly affect baking outcomes. Place an inexpensive oven thermometer on the centre rack and adjust the dial setting to compensate.

Frequently asked questions

What is Gas Mark 4 in Fahrenheit and Celsius?

Gas Mark 4 equals 350 °F or 177 °C. This is the most common moderate baking temperature, used for cakes, biscuits, and casseroles.

 How much should I reduce the temperature for a fan oven?

The standard rule is to lower the temperature by 25 °F (approximately 14 °C) when using a fan or convection oven. For example, a recipe calling for 400 °F conventional should be set to 375 °F in a fan oven. Some modern ovens make this adjustment automatically — check your manual.

 Why do my baking results differ even when the oven is set correctly?

Home ovens frequently run hotter or cooler than the dial indicates by 25–50 °F. Rack position, oven age, calibration drift, and altitude also affect results. An oven thermometer is the most reliable way to verify actual temperature.

 Is Gas Mark used outside the UK?

Gas Mark is primarily a British and some Commonwealth convention. Most American recipes use Fahrenheit, while continental European and many international recipes use Celsius. This converter handles all three so you can follow any recipe regardless of origin.

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