Oven Temperature Conversion: Fan, Gas Mark & Air Fryer

Oven temperature conversion chart

The chart lists approximate oven-dial settings, rounded to convenient numbers: Celsius to the nearest 10 degrees and Fahrenheit to the nearest 25. These are not exact mathematical equivalents: 140 °C is listed next to 275 °F, but converts to exactly 284 °F. Follow the recipe and your appliance instructions.

Print oven chart

Quick answers

• 350 °F converts to 176.67 °C (rounded to 2 decimals) → approximate dial settings: conventional 180 °C, or fan 160 °C.
• 375 °F converts to 190.56 °C (rounded to 2 decimals) → approximate dial settings: conventional 190 °C, or fan 170 °C.
• 400 °F converts to 204.44 °C (rounded to 2 decimals) → approximate dial settings: conventional 200 °C, or fan 180 °C.
• 425 °F converts to 218.33 °C (rounded to 2 decimals) → approximate dial settings: conventional 220 °C, or fan 200 °C.

And the most common Celsius settings, converted exactly:

• 130 °C = 266 °Fexact conversion
• 150 °C = 302 °Fexact conversion
• 170 °C = 338 °Fexact conversion
• 180 °C = 356 °Fexact conversion
• 200 °C = 392 °Fexact conversion

Fan oven vs conventional oven

A conventional (sometimes called “static” or “top and bottom heat”) oven warms the air with elements and relies on natural movement of hot air. A fan oven adds a fan at the back that blows hot air around the cavity. Moving air transfers heat to food faster, so the same dial setting cooks more quickly and browns more.

This converter uses an approximate 20 °C reduction from conventional to fan settings as a starting point. A 20 °C temperature difference equals 36 °F. Recipes may already list both settings, for example “180 °C / 160 °C fan”. Follow the recipe and your appliance manual, especially if your oven adjusts the temperature automatically.

Convection ovens

“Convection” is the North American name for a fan oven. Whirlpool recommends a 25 °F reduction as a rule of thumb for fan convection. That is about 14 °C, a different adjustment from this tool’s 20 °C reduction, rather than a rounded conversion of it.

Air fryer conversion

An air fryer is essentially a small, powerful fan oven. A good starting point for converting an oven recipe is to set the air fryer about 20 °C (roughly 36 °F) lower and reduce the cooking time by around 20%. Shake or turn food halfway through, and check a few minutes before the end — smaller baskets and thinner foods cook faster.

Treat these settings as starting points. Frozen foods, large portions and baked goods can behave differently; follow the recipe and your appliance instructions.

Gas mark chart and UK oven temperatures

Gas marks are a British scale for gas cookers, running from ¼ (very cool) to 9 (very hot). From Gas Mark 1 upward, each step is roughly 10–15 °C or 25 °F. Gas Mark ½ is about 120 °C (250 °F) and Gas Mark ¼ about 110 °C (225 °F), used for meringues and drying.

Modern UK recipes typically print three settings side by side: conventional Celsius, fan Celsius and gas mark — “200 °C / 180 °C fan / Gas Mark 6”. The chart above follows that convention, so you can read across one row whichever oven you have.

Converting gas mark to an electric oven

To cook a gas-mark recipe in an electric oven, find the gas mark in the table and use the conventional Celsius column for a standard electric oven, or the fan column if your oven has a fan. For example, Gas Mark 4 becomes 180 °C conventional or 160 °C fan. Gas ovens tend to be hotter at the top than the bottom, so if your recipe mentions a shelf position, a fan oven will usually give more even results than the original.