Oven Temperature Converter
Convert an oven setting between Fahrenheit, Celsius, and UK gas mark — with the nearest gas mark for any temperature.
To convert an oven temperature, use °C = (°F − 32) × 5 ÷ 9. So 350°F = 177°C, which sits at gas mark 4 — a “moderate oven” used for most cakes and roasts. Going the other way, °F = °C × 9 ÷ 5 + 32, and 200°C ≈ 400°F ≈ gas mark 6.
Why oven temperatures come in three scales
US recipes give oven heat in Fahrenheit, most of the world uses Celsius, and older British recipes and gas ovens use a gas mark — a numbered dial from ¼ up to 9. The two temperature scales convert exactly with a formula, while gas marks map to a fixed table of roughly equal steps of about 25°F (14°C) each. This tool shows all three at once so you can follow any recipe on any oven.
Reverse it with °F = °C × 9 ÷ 5 + 32; gas marks come from the standard UK table below.
Worked example
A recipe calls for a 350°F oven, but your dial is in Celsius.
- 1 Subtract 32 from the Fahrenheit value. 350 − 32 = 318.
- 2 Multiply by 5 ÷ 9. 318 × 5 ÷ 9 = 176.67, so 350°F ≈ 177°C.
- 3 Round to a sensible dial setting. Ovens are not precise, so 177°C rounds to the common 180°C mark.
- 4 Find the nearest gas mark. From the table, 180°C is gas mark 4 — a moderate oven.
- 5 Adjust for a fan oven if needed. A fan (convection) oven runs hotter, so drop 20°C to about 160°C.
Gas mark ↔ Celsius ↔ Fahrenheit
Standard UK gas-mark chart. Values are approximate and rounded to typical dial markings; each step is roughly 25°F.
| Gas mark | Celsius | Fahrenheit | Oven description |
|---|---|---|---|
| ¼ | 110°C | 225°F | Very cool |
| ½ | 120°C | 250°F | Very cool |
| 1 | 140°C | 275°F | Cool |
| 2 | 150°C | 300°F | Cool |
| 3 | 170°C | 325°F | Warm |
| 4 | 180°C | 350°F | Moderate |
| 5 | 190°C | 375°F | Moderately hot |
| 6 | 200°C | 400°F | Fairly hot |
| 7 | 220°C | 425°F | Hot |
| 8 | 230°C | 450°F | Very hot |
| 9 | 240°C | 475°F | Very hot |
Fan ovens and other pitfalls
Fan (convection) ovens run hotter. The moving air cooks faster, so a fan oven set to the same number browns and dries food more. The usual rule is to reduce the conventional temperature by about 20°C (or roughly 25°F) — so a 180°C recipe becomes 160°C fan. Some recipes label this “180°C / 160°C fan / gas 4”.
Gas marks are approximate. The table maps each mark to a rounded dial temperature, not an exact conversion. An exact 180°C is 356°F, but the chart lists gas 4 as 350°F because that is the standard marking. For cooking, these small differences do not matter.
Round to your dial. Home ovens swing by 10–15°C during use and rarely match the dial exactly. Convert, round to the nearest 5 or 10 degrees your oven offers, and rely on colour, timing, and a thermometer rather than the exact figure.