Oven Temperature Converter
Convert oven temperatures between Fahrenheit, Celsius, and British Gas Mark. Includes fan-oven adjustment.
What is Oven Temperature Converter?
The oven temperature converter handles the three scales used in U.S. and U.K. recipes: Fahrenheit, Celsius, and Gas Mark.
Formula
F → C: (F − 32) × 5/9. C → F: C × 9/5 + 32. Fan/convection: subtract 20°C (about 35°F) from a conventional recipe to compensate for circulation efficiency.
Worked example
350°F = 177°C ≈ Gas Mark 4. Fan equivalent: 157°C (or 315°F).
How to use this calculator
- Enter the temperature.
- Choose the input unit.
- All three equivalents (plus fan-oven adjusted) appear.
Frequently asked questions
Why is fan oven 20°C lower?
Convection (fan) ovens distribute heat more efficiently. A 180°C conventional recipe achieves the same effect at 160°C with the fan running. The 20°C reduction is a long-standing professional rule.
What is Gas Mark?
A British rating from 1/4 to 9 used on gas ovens. Each step is roughly 25°F (14°C). Gas Mark 4 = 350°F; Gas Mark 7 = 425°F.
Can I trust the conversion exactly?
Within ±5°F. Real ovens vary by ±25°F from the dial setting — buy an oven thermometer if accuracy matters.
What temperature should I use for…
Common: cookies 350°F, bread 425°F, pizza 500°F+, slow roast 275°F, cheesecake 325°F, broil ~550°F.