About This Oven Temperature Converter
Recipe temperatures can be confusing when you switch between American, British, and European cookbooks. US recipes typically use Fahrenheit, UK recipes often use Gas Mark, and most of the world uses Celsius. Add convection (fan) oven adjustments into the mix, and it becomes easy to over- or under-cook. This converter handles all four systems at once so you can set your oven with confidence.
Gas Mark Reference Chart
| Gas Mark | Celsius (°C) | Fahrenheit (°F) | Heat Level |
|---|---|---|---|
| GM 1 | 140°C | 275°F | Very Low |
| GM 2 | 150°C | 300°F | Low |
| GM 3 | 170°C | 325°F | Moderate-Low |
| GM 4 | 180°C | 350°F | Moderate |
| GM 5 | 190°C | 375°F | Moderate-Hot |
| GM 6 | 200°C | 400°F | Hot |
| GM 7 | 220°C | 425°F | Hot |
| GM 8 | 230°C | 450°F | Very Hot |
| GM 9 | 240°C | 475°F | Very Hot |
Conventional vs Fan (Convection) Ovens
Fan ovens circulate hot air with a built-in fan, which distributes heat more evenly and speeds up cooking. The general rule is to reduce the temperature by 20°C (35°F) compared to a conventional oven, or shorten the cooking time by 15–20%. Every oven is different, so check on food a few minutes early when you are trying a new recipe.
Frequently Asked Questions
Almost. 350°F converts to exactly 176.7°C, which is rounded to 180°C in most recipes. They are treated as equivalent for all practical cooking purposes.
Air fryers work like compact convection ovens. Use the fan oven temperature (conventional minus 20°C) as a starting point, and reduce cooking time by about 20%. Check food a few minutes early since air fryers can cook faster than expected.
Home ovens commonly run 10–30°C above or below the dial setting. An oven thermometer is the most reliable way to check your oven's true temperature and adjust your settings accordingly.