Oven temperature conversion chart: °F, °C, gas mark and convection
350 °F is 177 °C and gas mark 4. A full oven chart from 225 °F to 500 °F with Celsius, gas mark and the convection setting for each.
350 °F is 176.7 °C, which recipes round to 175 or 180 °C. It's gas mark 4. In a convection oven, start at 325 °F.
Below is the full chart, the formula, and when to lower the temperature for a fan.
The formula
- °F to °C: subtract 32, then multiply by 5/9.
- °C to °F: multiply by 9/5, then add 32.
Example: 180 °C × 9/5 = 324, plus 32 = 356 °F. US recipes move in 25-degree steps, so 180 °C recipes usually mean 350 °F.
Oven temperature chart
The exact Celsius value is the formula result. "Rounded" is to the nearest 5 °C, which is what most oven dials allow. Gas marks follow the standard kitchen table. The convection column subtracts 25 °F.
| °F | °C exact | °C rounded | Gas mark | Convection |
|---|---|---|---|---|
| 225 °F | 107.2 °C | 105 °C | 1/4 | 200 °F |
| 250 °F | 121.1 °C | 120 °C | 1/2 | 225 °F |
| 275 °F | 135 °C | 135 °C | 1 | 250 °F |
| 300 °F | 148.9 °C | 150 °C | 2 | 275 °F |
| 325 °F | 162.8 °C | 165 °C | 3 | 300 °F |
| 350 °F | 176.7 °C | 175 °C | 4 | 325 °F |
| 375 °F | 190.6 °C | 190 °C | 5 | 350 °F |
| 400 °F | 204.4 °C | 205 °C | 6 | 375 °F |
| 425 °F | 218.3 °C | 220 °C | 7 | 400 °F |
| 450 °F | 232.2 °C | 230 °C | 8 | 425 °F |
| 475 °F | 246.1 °C | 245 °C | 9 | 450 °F |
| 500 °F | 260 °C | 260 °C | 10 (rare) | 475 °F |
Gas marks
Gas mark is the British dial scale. The standard kitchen table, as given on Wikipedia (which cites The Guardian's conversion charts), pairs each mark with these temperatures:
| Gas mark | °F | °C (customary) | Heat |
|---|---|---|---|
| 1/4 | 225 | 110 | Very cool |
| 1/2 | 250 | 120 | Very cool |
| 1 | 275 | 140 | Cool |
| 2 | 300 | 150 | Cool |
| 3 | 325 | 170 | Warm |
| 4 | 350 | 180 | Moderate |
| 5 | 375 | 190 | Moderately hot |
| 6 | 400 | 200 | Moderately hot |
| 7 | 425 | 220 | Hot |
| 8 | 450 | 230 | Very hot |
| 9 | 475 | 240 | Very hot |
| 10 (less common) | 500 | 260 | Extremely hot |
From gas mark 1 upward, each step adds 25 °F. The Celsius column is rounded by custom, so it doesn't always match the formula. Gas mark 3 is listed as 170 °C, while 325 °F is really 162.8 °C. When a British recipe says "170 °C / gas mark 3," set your oven to 325 °F.
Common recipe temperatures, the other way round
| Recipe says | Exact °F | Set your oven to |
|---|---|---|
| 150 °C | 302 °F | 300 °F |
| 160 °C | 320 °F | 325 °F |
| 170 °C | 338 °F | 325 to 350 °F |
| 180 °C | 356 °F | 350 °F |
| 190 °C | 374 °F | 375 °F |
| 200 °C | 392 °F | 400 °F |
| 220 °C | 428 °F | 425 °F |
| 230 °C | 446 °F | 450 °F |
| 240 °C | 464 °F | 475 °F |
170 °C sits almost exactly between two US steps. For a delicate cake, take the lower one. For a recipe that also gives gas mark 3, use 325 °F.
Convection: how much to lower it
A convection oven has a fan that moves hot air, so heat reaches the food faster. Advice varies a little by source:
- Wolf tells owners to reduce standard recipe temperatures by 25° in convection mode, or reduce cooking time by 20 to 25%.
- America's Test Kitchen says manufacturers recommend lowering the temperature by 25 to 50 degrees and cutting time by 30%. In its own tests, a 25-degree drop worked for layer cakes, cookies and prebaked tart shells. It found roast chicken and yeasted bread needed no adjustment.
Our rule of thumb: lower by 25 °F and start checking early. That's the overlap between the two sources. Your oven's manual has the final word for your model.
Two traps:
- Some recipes are already written for a fan. If the recipe says "fan," "fan-assisted" or gives two temperatures, it's already adjusted. Don't lower it again.
- Don't double-dip. If you lower the temperature, don't also cut the time by 25%. Do one, then check.
Worked example
A British recipe says "bake at 200 °C, gas mark 6" and you have a US convection oven.
- 200 °C × 9/5 + 32 = 392 °F. Gas mark 6 is 400 °F. Use 400 °F.
- Does the recipe say "fan"? No. So adjust: 400 − 25 = 375 °F on convection.
- Start checking about 5 minutes before the stated time.
The oven temperature converter does this in one step, including gas marks and both convection rules.
Is your oven telling the truth?
Converting the number precisely doesn't help if the oven runs 25 degrees hot. An inexpensive oven thermometer on the middle rack tells you what's really happening. If cookies always brown too fast, check that before blaming the conversion.
For pan swaps that change baking time, see the pan size conversion chart.
Sources
Ingredient weights are published averages; your flour, your scooping and your oven can differ. Use the numbers as a reliable starting point, not a lab measurement.