🌡️ Temperature & ovens
170 °F to °C
170 °F is 76.7 °C. Subtract 32, multiply by 5 and divide by 9. On a fan oven, set about 57 °C.
The short answer
170 °F = 76.7 °C
Fan oven: 57 °C. This is a very low oven.
About 170 °F in °C
170 °F is 76.7 °C. The formula is (F − 32) × 5/9: 170 − 32 = 138, then 138 × 5 ÷ 9 = 76.7. Celsius and Fahrenheit cross at − 40, not at zero, which is why the subtraction comes first.
Fan ovens run about 20 °C cooler than the temperature written on a conventional recipe, so a 170 °F instruction becomes 57 °C on a fan setting. If your oven only has round numbers, choose the nearest (80 °C) and adjust the time by about 10%.
A 170 °F oven is in the very low band — roughly gas mark ¼. That matters more than the exact degree: a 10 °C error changes a sponge by a couple of minutes, while the wrong band changes whether the outside browns before the middle sets.
Gas marks are a third scale in the same kitchen: 170 °F, 77 °C and a gas mark all describe one oven heat, and British recipes still print two of the three side by side. Converting 170 °F to 77 °C and then to a fan setting of 57 °C keeps the recipe's intent even when your oven runs a little hot.
Recipe apps often write the question as 170 f to c rather than with degree symbols, and the answer is the same: 76.7 c. Rounded to 77 c, that is what most oven dials can actually be set to.
How the calculation works
- (170 °F − 32) × 5/9 = 76.7 °C
- Fan oven: 76.7 − 20 = 56.7 °C
- Reverse: (76.7 °C × 9/5) + 32 = 170 °F
Reference values
| Fahrenheit | Celsius | Fan oven |
|---|---|---|
| 120 °F | 49 °C | 29 °C fan |
| 145 °F | 63 °C | 43 °C fan |
| 170 °F | 77 °C | 57 °C fan |
| 195 °F | 91 °C | 71 °C fan |
| 220 °F | 104 °C | 84 °C fan |