Convert oven temperatures between Fahrenheit, Celsius, fan (convection), and gas mark in one step.
Usage Tip
When a recipe lists a conventional temperature, set a fan oven about 20°C lower for the same result.
Converted Temperature
— °C
Primary conversion resultTHE MATH
°C = (°F − 32) × 5/9
Fan = °C − 20 · Gas Mark = (°F − 275) ÷ 25 + 1
Fan / convection ovens run about 20°C cooler than conventional ovens. Gas mark values are approximate and shown only within the standard 1–10 range.
Popular oven temperature conversions
350°F = 180°CGas 4 = 350°F180°C = 350°F400°F = 200°CFan = conventional −20°C
Oven temperature conversion chart
| Fahrenheit | Celsius | Fan °C | Gas Mark | Description |
|---|---|---|---|---|
| 275°F | 140°C | 120°C | Gas 1 | Very cool |
| 300°F | 150°C | 130°C | Gas 2 | Cool |
| 325°F | 160°C | 140°C | Gas 3 | Warm |
| 350°F | 180°C | 160°C | Gas 4 | Moderate |
| 375°F | 190°C | 170°C | Gas 5 | Moderately hot |
| 400°F | 200°C | 180°C | Gas 6 | Hot |
| 425°F | 220°C | 200°C | Gas 7 | Hot |
| 450°F | 230°C | 210°C | Gas 8 | Very hot |
| 475°F | 240°C | 220°C | Gas 9 | Very hot |
Exact vs recipe-rounded: recipes round to convenient numbers (350°F ≈ 180°C), while the calculator above gives the exact maths (350°F = 176.7°C). Either works in practice – ovens are not that precise.
Common oven temperature questions
What is 350°F in Celsius?
Exactly 177°C, usually rounded to 180°C in recipes. That is gas mark 4, or 160°C in a fan oven – a moderate oven good for most cakes and bakes.
What is 180°C in Fahrenheit?
About 356°F, rounded to 350°F in most recipes. It is gas mark 4 and 160°C fan.
What is gas mark 4?
Gas mark 4 is a moderate oven, about 350°F / 180°C (160°C fan). Each gas mark step is roughly 25°F or 14°C.
How do I convert a recipe for a fan oven?
Lower the conventional temperature by about 20°C (or 25°F, one gas mark), since fans circulate heat more efficiently. So a recipe at 180°C becomes about 160°C fan.
Frequently asked questions
What is 350°F in Celsius?177°C exactly; recipes round it to 180°C (gas mark 4, 160°C fan).
How much do I lower a fan oven?By about 20°C from the conventional temperature, or roughly 25°F.
What is gas mark 4?A moderate oven, about 350°F / 180°C.
Why do the chart and calculator differ slightly?Recipes round to convenient numbers (180°C) while the calculator gives the exact conversion (176.7°C). Both bake the same in practice.
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Note: Oven temperatures vary by model and door-opening, and recipe charts round to convenient numbers. Use an oven thermometer for accuracy, and treat fan adjustments as a starting point.