Oven temperature conversion chart
These are the settings recipes use, in the pairs printed on oven dials. A recipe that says 350°F means the same oven as one that says 180°C, 160°C fan or gas mark 4.
| Gas mark | Fahrenheit | Celsius | Celsius, fan oven | Oven heat |
|---|---|---|---|---|
| ¼ | 225°F | 110°C | 90°C | Very cool |
| ½ | 250°F | 120°C | 100°C | Very cool |
| 1 | 275°F | 140°C | 120°C | Cool |
| 2 | 300°F | 150°C | 130°C | Cool |
| 3 | 325°F | 160°C | 140°C | Moderate |
| 4 | 350°F | 180°C | 160°C | Moderate |
| 5 | 375°F | 190°C | 170°C | Moderately hot |
| 6 | 400°F | 200°C | 180°C | Moderately hot |
| 7 | 425°F | 220°C | 200°C | Hot |
| 8 | 450°F | 230°C | 210°C | Hot |
| 9 | 475°F | 240°C | 220°C | Very hot |
Why 350°F is 180°C and not 177°C
The exact conversion of 350°F is 176.7°C, and no oven has that setting. Recipe writers and oven makers round to the nearest step on the dial, so 350°F is always written as 180°C. This converter gives the dial setting. For a temperature between two steps it rounds to the nearest 5 degrees.
Fan ovens and convection ovens
A fan moves hot air around the food, so a fan oven cooks faster at the same temperature. In the United Kingdom the rule is to set a fan oven about 20°C lower than a conventional one: 180°C becomes 160°C fan. In the United States the same kind of oven is called a convection oven, and the usual rule is 25°F lower. Choose Celsius (fan) in the converter to work from a fan setting.
What gas marks mean
Gas marks are the dial numbers of gas ovens in the United Kingdom and Ireland. Gas mark 1 is 275°F, and each mark above it adds 25°F, up to gas mark 9 at 475°F. The two lowest settings, ¼ and ½, are 225°F and 250°F.
Where the chart comes from
Gas marks 1 to 9, with their Fahrenheit, Celsius and fan values, follow the oven temperature conversion table published by Which?, the UK consumer organization. The fan rule of about 20°C is theirs too.
