Oven Temperature Converter

The Oven Temperature Converter turns any oven temperature into every unit you might need — Celsius, Fahrenheit, and UK Gas Mark — and adds the one thing most converters miss: the matching fan (convection) oven setting. Enter a value from any recipe, choose whether it is for a conventional or fan oven, and instantly read the equivalents on a visual oven dial, along with the heat level and what that temperature is good for cooking.

Oven Temperature Conversion Chart

This chart shows the most common oven temperatures side by side. The fan column is the setting to use in a fan or convection oven — always about 20 °C below the conventional value.

Note: cooking charts round these values (180 °C is listed as 350 °F even though the exact conversion is 356 °F). This converter shows the precise mathematical result and then matches it to the nearest standard gas mark.

Oven Temperature Conversion Formulas

All three units describe the same heat, so converting between them is a matter of two arithmetic rules plus a gas-mark lookup.

Conventional vs Fan (Convection) Ovens

A conventional oven heats from top and bottom elements, so heat rises and sits still. A fan oven (also called convection) adds a fan that circulates hot air, cooking food faster and more evenly. Because moving air transfers heat more efficiently, a fan oven browns food at a lower dial setting. The standard manufacturer guidance is to reduce the temperature by 20 °C (roughly 35–40 °F) when converting a conventional-oven recipe to a fan oven, and often to shorten the cooking time slightly too.

Understanding Oven Heat Levels

• Very Cool / Cool (110–150 °C): Slow roasting, rich fruit cakes, meringues, drying, and gentle braises.
• Warm (150–170 °C): Casseroles, custards, cheesecakes, and slow bakes.
• Moderate (170–190 °C): The everyday baking zone — cakes, cookies, sponges, and muffins.
• Hot (190–220 °C): Roasting meat and vegetables, pies, bread, and crumbles.
• Very / Extremely Hot (220 °C and above): Crispy roast potatoes, scones, puff pastry, pizza, and searing.

How to Use This Calculator

1. Choose the input unit: Select Celsius, Fahrenheit, or Gas Mark to match your recipe.
2. Enter the temperature: Type the value, or choose a gas mark from the list.
3. Pick your oven type: Tell the tool whether the value is for a conventional oven or a fan (convection) oven.
4. Click Convert: Read every equivalent, the recommended fan-oven setting, the heat level, and the visual oven dial with a full step-by-step breakdown.

Why Accurate Oven Temperature Matters

Frequently Asked Questions

How much lower should a fan oven be set?

Set a fan (convection) oven about 20 °C lower than the temperature a conventional-oven recipe gives. For example, a recipe calling for 180 °C in a conventional oven becomes 160 °C in a fan oven. The moving air browns food faster, so the lower dial setting produces the same result.

What is 180 °C in Fahrenheit and Gas Mark?

180 °C is 356 °F and Gas Mark 4. On most oven charts this moderate baking temperature is rounded to 350 °F. In a fan oven you would set it to 160 °C.

What is the formula to convert Celsius to Fahrenheit?

Fahrenheit equals Celsius multiplied by 9, divided by 5, plus 32. To go the other way, subtract 32 from the Fahrenheit value, then multiply by 5 and divide by 9 to get Celsius.

How do gas marks relate to Fahrenheit?

For Gas Mark 1 and above, Fahrenheit equals 25 times the gas mark plus 250. So Gas Mark 4 is 25 × 4 + 250 = 350 °F. The low fractional marks are exceptions: Gas Mark ¼ is about 225 °F and Gas Mark ½ is about 250 °F.

Do gas ovens have a fan setting?

Most gas ovens are conventional and do not have a fan, so gas marks are conventional temperatures. Some modern gas ovens do include a fan. If yours does, use the fan Celsius value this converter shows, which is 20 °C lower than the conventional temperature.

Why does my converted temperature differ from the recipe chart?

Recipe charts round temperatures for convenience, so 180 °C is listed as 350 °F even though the exact conversion is 356 °F. This converter shows the precise mathematical conversion and then matches it to the nearest standard gas mark, which is why you may see a small difference from a rounded chart.

Additional Resources

• Gas Mark - Wikipedia
• Convection Oven - Wikipedia