Oven Temperature Converter
Enter a temperature in any oven scale to see the equivalent in Fahrenheit, Celsius, gas mark and fan-assisted (convection) settings.
Reviewed by the ToolNestr Editorial Team — July 2026
Enter a temperature and select its scale to see all conversions.
How it works
The Oven Temperature Converter handles all four common oven temperature scales — Fahrenheit, Celsius, gas mark and fan-assisted Celsius — using a two-step process. Your input is first converted to Celsius as the base reference, and then converted outward to every other scale. The fan oven temperature is calculated by subtracting 20°C from the conventional Celsius value, which is the standard adjustment recommended by most oven manufacturers and cookbook authors.
Gas marks are a numbered scale (1 through 9) used primarily in the UK and Ireland for gas ovens. Each gas mark corresponds to a specific temperature range. The conversion is not perfectly linear — gas mark 4 is 180°C, gas mark 6 is 200°C and gas mark 9 is 240°C — but the steps are well established and consistent across modern gas ovens. Electric fan ovens have their own dedicated temperature guides because the circulating air transfers heat more efficiently than static heat.
How the conversion works
All conversions go through Celsius. The formula for Fahrenheit to Celsius is (°F − 32) × 5/9. For gas marks, we use the standard conversion table derived from British gas oven standards. The fan temperature is simply conventional Celsius minus 20°C.
Worked example
An American recipe calls for a 375°F oven, but your oven is marked in Celsius with a fan setting. What are the equivalents?
International home cook
Following a recipe from a different country and need to convert the oven temperature to match your local oven's markings and settings.
Bread enthusiast
Bread recipes are sensitive to temperature. Converting between oven types accurately ensures your crust and crumb develop as the recipe intends.
Cookbook author
Publishing recipes for an international audience requires providing oven temperatures in multiple scales so readers worldwide can follow along.
New oven owner
Just bought a new fan oven and need to adapt your collection of conventional-temperature recipes to the new appliance.
How to use the Oven Temperature Converter
Enter the temperature
Type the temperature number from your recipe. This can be a Celsius value, Fahrenheit value or gas mark number.
Select the input scale
Choose whether your entered value is in Celsius, Fahrenheit, gas mark or fan-assisted oven temperature from the dropdown.
Read all equivalents
See the temperature in all four scales instantly, including the fan oven setting so you can set your oven correctly the first time.
Tips for best results
Know your oven's actual temperature
Ovens often run hotter or colder than the dial says (by 10–30°C in some cases). An oven thermometer costs very little and lets you calibrate your understanding of your specific oven's behaviour.
Reduce cooking time for fan ovens
In addition to lowering the temperature by 20°C, fan ovens often cook slightly faster. Start checking for doneness 5–10 minutes before the recipe's recommended time when using fan mode.
Gas marks are approximate
Gas marks are a guide, not an exact temperature. The actual temperature in a gas oven can vary between models and even between the top and bottom of the oven. Use an oven thermometer to verify.
Related tools
Frequently asked questions
Why do ovens use different temperature scales?
Different regions standardised on different systems historically. The US uses Fahrenheit for all cooking, most of Europe and Asia use Celsius, the UK and Ireland use gas marks for gas ovens (a numbered scale from 1 to 9), and fan-assisted settings reflect the fact that convection ovens cook faster and at a lower temperature than conventional ovens.
What is the difference between conventional and fan ovens?
A conventional (static) oven heats from the top and bottom elements, creating hot and cool spots. A fan (convection) oven circulates hot air with a fan, distributing heat evenly and cooking food about 20–25% faster. For fan ovens, you typically reduce the conventional temperature by 20°C (or about 25–30°F).
How do I convert Fahrenheit to Celsius?
The formula is: (°F − 32) × 5/9 = °C. For example, 350°F = (350 − 32) × 5/9 = 318 × 5/9 = 177°C, which is typically rounded to 175°C or 180°C in recipes.
What gas mark is 180°C?
180°C (350°F) is Gas Mark 4 in the UK and Ireland gas oven scale. Gas mark numbers increase by about 14°C (25°F) per step: Mark 1 = 140°C, Mark 2 = 150°C, Mark 3 = 160°C, Mark 4 = 180°C, Mark 5 = 190°C, Mark 6 = 200°C, Mark 7 = 220°C, Mark 8 = 230°C and Mark 9 = 240°C.
Should I reduce temperature for a fan oven?
Yes — reduce the conventional oven temperature by 20°C (or approximately 25–30°F) when using a fan-assisted oven. For example, if a recipe says 200°C conventional, set your fan oven to 180°C. The cooking time may also reduce slightly.