340 °F to Celsius
340 °F = 171.1 °C
In recipes: 170 °C. Fan oven: 151 °C. Gas mark 3. Typically used for most cakes, cookies, muffins and quick breads.
Fan (convection) ovens run hotter at the same setting, so recipes usually drop the temperature by about 20 °C (25 °F).
- Fahrenheit
- 340°F
- Celsius
- 171°C
- Fan / convection
- 151°C
- Gas mark
- 3
Exact: 171.1 °C = 340.0 °F. Recipes round to the nearest 5 or 10 degrees, and so do oven dials.
How it’s calculated
(340 − 32) × 5 ÷ 9 = 171.11 °C.
If your oven is a fan or convection model, lower the setting by about 20 °C, or keep it and start checking 5–10 minutes early.
Other temperatures
Questions bakers ask
What is 340 °F in Celsius?
340 °F is 171.1 °C. Recipes usually round this to 170 °C.
What is 340 °F in a fan oven?
About 151 °C (315 °F) in a fan or convection oven, roughly 20 °C lower than a conventional oven.
Is 340 °F hot or moderate for an oven?
340 °F (171.1 °C) is a moderate oven, typically used for most cakes, cookies, muffins and quick breads.
What gas mark is 340 °F?
Gas mark 3 (170 °C / 325 °F) is the closest setting.