Convert between Celsius, Fahrenheit, Gas Mark, and fan oven temperatures. Enter a value in one format to see all the others.
Enter a temperature and select its unit to see all conversions.
Cooking can be confusing when recipes call for different temperature units. This is especially true in the UK, where older recipes might use Gas Marks, while newer ones use Celsius. American recipes almost always use Fahrenheit. This Calculator Site tool helps you easily switch between them, ensuring your baking and roasting is always spot on.
The main difference between oven types is air circulation. A conventional oven cooks with static heat, which can create hot spots. A fan oven (or convection oven) circulates hot air for more even cooking, usually requiring a temperature drop of about 20°C. You can explore other conversions with our general temperature converter.
What are Gas Marks?
Gas Marks are a temperature scale used on gas ovens in the UK and Ireland. They are less precise than Celsius or Fahrenheit, representing temperature ranges rather than exact points. For example, Gas Mark 4 is considered a 'moderate' oven, equivalent to about 180°C or 350°F. Many classic British recipes from authors like Mary Berry still use this system.
Most recipes use descriptive terms for oven heat. Here are the standard equivalents that every home cook should know. Remember to preheat your oven properly for the best results. For specific meal timings, check our cooking time calculator.
180°C
'Moderate' Oven (Gas Mark 4)
-20°C
Typical Fan Oven Reduction
220°C
'Hot' Oven (Gas Mark 7)
How to use this Calculator Site tool
Enter a temperature in any of the four fields: Celsius (Conventional), Fahrenheit, Gas Mark, or Celsius (Fan). As you type, all other fields will instantly update with the converted values. This makes it simple to switch between different recipe formats on the fly.
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