Oven Temperatures Demystified: Convection, Gas Mark, and Fan Oven Conversions
Learn how to convert recipe oven temperatures across Fahrenheit, Celsius, Gas Mark, and Fan-assisted ovens with exact formulas and baking rules.
Why Fan Ovens Require Temperature Reductions
Convection ovens (commonly termed "fan ovens" in the UK, Australia, and New Zealand) incorporate an internal fan that actively circulates heated air around food. This continuous airflow breaks down the blanket of cooler air that naturally surrounds cold dough or meat.
Because convection transfers thermal energy far more efficiently than still radiant heat, using the temperature specified for a conventional oven will cause cookies to burn on the edges before the center bakes. The standard culinary rule of thumb is to reduce the temperature by 20°C (or 25°F).
Switch between Fahrenheit, Celsius, British Gas Marks, and Fan Oven settings in real time.
Master Oven Temperature Conversion Table
Use this comprehensive comparison table to quickly convert recipe temperatures across all major international oven systems:
| Gas Mark | Conventional °F | Conventional °C | Fan Oven °C | Culinary Description |
|---|---|---|---|---|
| 1/4 | 225°F | 110°C | 90°C | Very Cool / Meringue & Fruit Dehydration |
| 1/2 | 250°F | 130°C | 110°C | Slow Oven / Slow-cooked Stews |
| 1 | 275°F | 140°C | 120°C | Warm / Rich Fruit Cakes |
| 2 | 300°F | 150°C | 130°C | Slow / Cheesecakes & Shortbread |
| 3 | 325°F | 165°C | 145°C | Moderate Slow / Sponge Cakes |
| 4 | 350°F | 177°C | 160°C | Moderate Standard / Cookies, Muffins, Brownies |
| 5 | 375°F | 190°C | 170°C | Moderate Hot / Quick Breads & Roasted Veggies |
| 6 | 400°F | 200°C | 180°C | Hot / Pies, Choux Pastry & Roasted Chicken |
| 7 | 425°F | 220°C | 200°C | Hot / Scones & Crispy Potatoes |
| 8 | 450°F | 230°C | 210°C | Very Hot / Puff Pastry & Crusty Artisan Bread |
| 9 | 475°F | 245°C | 225°C | Extremely Hot / Homemade Pizza |
Frequently Asked Questions
Should I reduce cooking time or temperature for convection?
Culinary instructors recommend reducing the temperature by 20°C (25°F) while keeping cooking time the same. This preserves delicate crust development without drying out the interior.
What is 350°F in a fan oven?
350°F conventional is 177°C. In a fan-assisted oven, reduce the setting to 160°C (or 325°F) for identical baking performance.