Oven Temperature Converter (Fan, Conventional, °F and Gas Mark)
Convert between conventional and fan oven temperatures, in °C or °F, with the gas mark table.
Inputs
| Gas mark | °C | °F | Fan °C |
|---|---|---|---|
| ¼ | 110 | 225 | 90 |
| ½ | 120 | 250 | 100 |
| 1 | 140 | 275 | 120 |
| 2 | 150 | 300 | 130 |
| 3 | 170 | 325 | 150 |
| 4 | 180 | 350 | 160 |
| 5 | 190 | 375 | 170 |
| 6 | 200 | 400 | 180 |
| 7 | 220 | 425 | 200 |
| 8 | 230 | 450 | 210 |
| 9 | 240 | 475 | 220 |
| 10 | 260 | 500 | 240 |
- Working
- 180 °C conventional − 20 = 160 °C fan
- Conventional
- 180 °C / 356 °F
- Fan / convection
- 160 °C / 320 °F
- Nearest gas mark (conventional)
- 4 (180 °C / 350 °F)
- Check a few minutes before the recipe's time — fan ovens also cook faster, not just at a lower setting.
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What each Oven Temperature input means
- Convert
- Conventional to fan (the recipe's temperature for your fan oven), or fan to conventional.
- Temperature
- The temperature from the recipe, or on your fan oven's dial.
- Unit
- °C or °F. Both are shown in the result, with the nearest gas mark.
Oven Temperature conversion formula
fan °C = conventional °C − 20 · conventional °C = fan °C + 20 · °F = °C × 9 ÷ 5 + 32 · gas mark 4 = 180 °C = 350 °F, each mark above 4 adds about 10 °C
Most published recipes give conventional-oven temperatures. A fan (convection) oven circulates the hot air, so food cooks faster and browns sooner at the same setting; the usual correction, printed in UK recipe books and on packaging, is to set a fan oven 20 °C lower — a 36 °F difference — and to start checking a little before the stated time. Gas ovens are marked in gas marks, where mark 4 is 180 °C (350 °F) and each mark up or down is roughly 10 °C in the middle of the range. The page converts in either direction, works in °C or °F, names the nearest gas mark, and prints the full table so a recipe in any of the three systems can be read on any oven.
Oven Temperature conversion worked example
A recipe says 180 °C: in a fan oven set 180 − 20 = 160 °C. That is 350 °F conventional (320 °F fan) and gas mark 4. A US recipe at 400 °F is 204 °C conventional, so about 185 °C in a fan oven — 180 °C on a dial marked in tens — and gas mark 6. Going the other way, a cake baked at 160 °C fan was written for 180 °C conventional.
More Oven Temperature examples
A US recipe at 425 °F in a fan oven: 425 °F is 218 °C; 20 °C less is 198 °C, which is 389 °F — set about 390 °F, or 200 °C on a metric dial.
A packet that says 160 °C fan: a conventional oven needs 180 °C, which is 356 °F (350 °F on most dials) or gas mark 4.
Where the Oven Temperature converter can give the wrong answer
- Twenty degrees is a convention, not a law. Ovens vary by manufacturer and age; the manual's own conversion, or an oven thermometer, beats the rule.
- Fan ovens also cook faster, not only hotter. Even at the corrected temperature, check 5–10 minutes before the recipe's time, especially for biscuits and thin things.
- Some fan ovens have a conventional (no-fan) mode; if you use it, no conversion is needed.
- Gas marks are approximate and the table's °C values are rounded to tens; a gas mark is a range, not a point.
- Very low settings (drying meringues at 90 °C) and very high ones (pizza at 250 °C+) are where fan ovens differ most from the rule; watch them.
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Oven Temperature conversion FAQ
- 160 °C — subtract 20. The same applies across the range: 200 °C conventional is 180 °C fan, 220 °C is 200 °C fan. Check a few minutes early as well.
- 350 °F is 177 °C, usually rounded to 180 °C conventional, so about 160 °C in a fan oven. 375 °F is 190 °C (170 °C fan), 400 °F is 200 °C (180 °C fan), 425 °F is 220 °C (200 °C fan).
- Gas mark 4, 6 and 7. The table on the page lists every mark from ¼ (110 °C) to 10 (260 °C) with its °F and fan equivalents.
- The fan keeps hot air moving over the food, which transfers heat faster than still air at the same temperature. Setting it 20 °C lower brings the cooking back to what the recipe intended and stops the outside browning before the inside is done.
- 200 °C fan corresponds to 220 °C conventional, which is 425 °F in a conventional oven. The fan setting itself, 200 °C, is 392 °F.
- Yes — 'convection' is the US name for a fan-assisted setting. The same 20 °C (36 °F) reduction is the usual starting point.
- The fan keeps moving hot air across the surface, which carries heat in faster than still air. Lower the setting by 20 °C, check early, and cover the top loosely with foil if it colours before the middle is done.