Oven Temperature Converter
Convert between Fahrenheit, Celsius, and gas mark, and adjust for a fan oven that runs hotter than the dial says.
Your details
Fan ovens cook faster, so the dial setting differs
This calculator runs entirely on your device. Nothing you enter is uploaded, stored, or sold. How this works
350°F is
175°C
Gas mark 4 — 176.7°C exactly
Includes your inputs, the full breakdown, and every row of the table.
Fahrenheit
350°F
Conventional oven
Celsius
175°C
Conventional oven
Fan oven
325°F / 165°C
Gas mark
4
- Conventional oven setting
- 350°F / 175°C
- Fan / convection setting
- 325°F / 165°C
- Gas mark equivalent
- Gas mark 4
- Exact conversion
- 350°F = 176.7°C
| Gas mark | °F | °C | Fan °C | Description |
|---|---|---|---|---|
| ¼ | 225°F | 110°C | 95°C | Very cool |
| ½ | 250°F | 120°C | 105°C | Very cool |
| 1 | 275°F | 140°C | 125°C | Cool to moderate |
| 2 | 300°F | 150°C | 135°C | Cool to moderate |
| 3 | 325°F | 165°C | 150°C | Cool to moderate |
| 4 | 350°F | 180°C | 165°C | Moderate |
| 5 | 375°F | 190°C | 175°C | Moderate |
| 6 | 400°F | 200°C | 185°C | Moderately hot |
What this means
- Fan ovens are converted at 25°F, about 15°C, below the conventional setting. Some manufacturers advise 20°C — check your manual, because the fan speed varies by model.
- Gas marks are spaced 25°F apart above mark 1, so most convert exactly. Where a temperature falls between marks, the nearest is shown.
- Domestic oven thermostats are routinely off by 25°F or more, and they swing above and below the set point as the element cycles. An oven thermometer is the cheapest fix for inconsistent baking there is.
How the oven temperature converter calculation works
Oven temperature is expressed three different ways in three different recipe traditions. American recipes use Fahrenheit, most of the rest of the world uses Celsius, and British recipes — particularly older ones — use gas marks, a scale that maps to the valve settings on a gas oven rather than to any unit of temperature.
Gas marks are unusual in that they are linear above mark 1: each step is exactly 25°F. Gas mark 4 is 350°F, mark 5 is 375°F, and so on. Below mark 1 the scale splits into quarter and half marks for the low temperatures used in slow roasting and meringues.
The fan oven adjustment is the part people get wrong most often. A fan circulates hot air, which strips away the insulating layer of cooler air sitting against the surface of the food, so heat transfers faster at the same air temperature. Setting a fan oven 25°F lower produces roughly the same result as a conventional oven at the higher setting. Recipes almost never say which type they assume, so if something browns faster than the recipe claims, the fan is the likely reason.
Frequently asked questions
What is gas mark 4 in Fahrenheit and Celsius?
Gas mark 4 is 350°F or 180°C, the standard moderate oven that a large share of baking recipes call for. Each gas mark above 1 is 25°F apart, so mark 5 is 375°F, mark 6 is 400°F, and mark 3 is 325°F.
Do I lower the temperature for a fan oven?
Yes, by about 25°F or 15°C. A fan oven at 325°F browns roughly like a conventional oven at 350°F. Some manufacturers suggest 20°C instead, and fan speed varies between models, so treat the conversion as a starting point and watch the food rather than the clock.
Should I also shorten the cooking time in a fan oven?
If you have already dropped the temperature by 25°F, the time should be close to the original. If you keep the temperature the same and rely on the fan, expect the food to be done roughly a quarter sooner. Doing both at once is how things end up underdone in the middle.
Why does my oven not match the dial?
Domestic thermostats are frequently 25°F or more out of calibration, and they work by cycling the element on and off, so the real temperature oscillates around the set point rather than holding steady. A standalone oven thermometer tells you what is actually happening, and it explains most unexplained baking failures.
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Disclaimer. This calculator is provided for general information and educational purposes only and does not constitute financial, tax, legal, medical, or engineering advice. Results are estimates based on the inputs you provide and the assumptions described above. Confirm any figure with a qualified professional before acting on it.