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Oven Temperature Converter

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Convert oven temperatures between Celsius, Fahrenheit, and UK Gas Mark - handy when following a recipe written for a different oven scale.

Oven Temperature Converter

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Celsius
180°C
Fahrenheit
350°F
Gas Mark
4
Gas Mark uses standard published baking values, not a pure mathematical conversion, since ovens round to practical settings.

The reference table

Gas Mark 1/4 = 110C / 225F Gas Mark 3 = 160C / 325F Gas Mark 7 = 220C / 425F Gas Mark 1/2 = 120C / 250F Gas Mark 4 = 180C / 350F Gas Mark 8 = 230C / 450F Gas Mark 1 = 140C / 275F Gas Mark 5 = 190C / 375F Gas Mark 9 = 240C / 475F Gas Mark 2 = 150C / 300F Gas Mark 6 = 200C / 400F
Example

180°C (a very common baking temperature) equals 350°F, or Gas Mark 4.

Step-by-step guide

  1. Enter your known temperature.
  2. Select which scale you're converting from - Celsius, Fahrenheit, or Gas Mark.
  3. Read the equivalent in the other two scales.

Why Gas Mark isn't a clean mathematical conversion

Unlike Celsius and Fahrenheit (which convert with an exact formula), Gas Mark is a standardized British scale defined by a fixed lookup table tied to practical oven settings, not a linear formula - which is why this tool matches your input to the nearest standard Gas Mark value from the official table rather than calculating one mathematically. This matches how real ovens and recipes actually work, since oven dials round to these practical marks rather than displaying arbitrary precise temperatures.

Common mistakes

Assuming a fan/convection oven needs the same temperature as a conventional oven - many recipes suggest lowering the temperature by about 20°C (or 25°F) for fan-assisted ovens, since they cook more efficiently.
Assuming an oven's actual internal temperature exactly matches its dial setting - home ovens are commonly several degrees off from their displayed setting, so an oven thermometer gives a more reliable reading for precise baking.

Frequently asked questions

What is Gas Mark?

Gas Mark is a temperature scale traditionally used on British and Irish gas ovens, running from a low of 1/4 up through 9, still commonly referenced in UK recipes and cookbooks alongside or instead of Celsius.

Should I adjust temperature for a fan (convection) oven?

Many recipes and oven manufacturers suggest lowering the temperature by about 20°C (or roughly 25°F) for a fan-assisted setting compared to a conventional oven, since the moving air cooks food more efficiently at the same nominal temperature.

Why does my food take longer or shorter than the recipe says at the "same" temperature?

Home ovens frequently run several degrees hotter or cooler than their dial suggests - an inexpensive oven thermometer placed inside can reveal your oven's real behavior and help you adjust future bakes accordingly.

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