Gas Mark to Air Fryer Converter
Pick the gas mark from your recipe and enter the cooking time.
Recipe in plain Celsius instead? The 180°C, 200°C and 220°C pages cover the common settings, and fan oven recipes have their own rule on the fan oven to air fryer page.
Complete Gas Mark to Air Fryer Conversion Chart
Every gas mark with its conventional oven temperature and converted air fryer setting.
| Gas Mark | Oven (°C) | Air Fryer (°C) | Air Fryer (°F) | Common Use |
|---|---|---|---|---|
| Gas Mark 1/4 | 110°C | 100°C | 210°F | Very slow drying, meringues |
| Gas Mark 1/2 | 120°C | 110°C | 230°F | Very slow cooking |
| Gas Mark 1 | 140°C | 125°C | 260°F | Slow stews, rich fruit cakes |
| Gas Mark 2 | 150°C | 135°C | 275°F | Slow roasts, casseroles |
| Gas Mark 3 | 160°C | 145°C | 295°F | Low baking, milk puddings |
| Gas Mark 4 | 180°C | 160°C | 320°F | Cakes, biscuits, most baking |
| Gas Mark 5 | 190°C | 175°C | 345°F | Bread, pastry, roast chicken |
| Gas Mark 6 | 200°C | 180°C | 355°F | Roast potatoes, pies, chips |
| Gas Mark 7 | 220°C | 200°C | 390°F | Crispy roasting, Yorkshire puddings |
| Gas Mark 8 | 230°C | 210°C | 410°F | Very hot roasting, pizza |
| Gas Mark 9 | 240°C | 220°C | 430°F | Maximum heat, fast browning |
Time rule for every row: reduce the oven recipe time by about 20%.
How Gas Marks Convert to the Air Fryer
Gas marks are the temperature scale printed on British gas oven dials and used across decades of UK cookbooks, recipe cards and older packet instructions. Each mark maps to a conventional oven temperature, gas mark 4 is 180°C, gas mark 6 is 200°C, and once you have that temperature, the standard air fryer rule applies: drop about 20°C and cut the time by 20%. So a gas mark 6 recipe for 40 minutes becomes 180°C for about 32 minutes in the air fryer. The chart above does both steps for you in one lookup.
The marks worth memorising are the two that cover most home cooking. Gas mark 4 is the baking mark, cakes, biscuits and everyday bakes, converting to 160°C in the air fryer. Gas mark 6 is the roasting mark, potatoes, chips, pies and chicken, converting to 180°C. If a handwritten recipe says "moderate oven" it means gas mark 4, and "hot oven" means gas mark 6 to 7, conventions that predate temperature dials entirely.
One thing gas marks never are: fan temperatures. Gas ovens heat conventionally, so gas mark recipes always convert with the standard rule, never the gentler fan oven rule. For baking specifically, cakes and biscuits from gas mark recipes do better with the extra gentle settings on the baking to air fryer page, since air fryers brown baked goods faster than any gas oven.
Gas Mark to Air Fryer: Frequently Asked Questions
Gas mark 4 is 180°C in a conventional oven, which converts to about 160°C (320°F) in an air fryer with cooking time reduced by 20%. It is the standard baking mark, so for cakes and biscuits consider dropping a little further, to 150°C.
Gas mark 6 is 200°C in a conventional oven, converting to about 180°C (355°F) in an air fryer with 20% less time. It is the roasting mark, so a gas mark 6 recipe for 40 minutes becomes 180°C for about 32 minutes.
Always conventional. Gas ovens heat without fans, so every gas mark recipe converts with the standard rule of about 20°C lower and 20% less time, never the gentler fan oven rule.
Moderate oven means gas mark 4 (180°C), so use 160°C in the air fryer. Slow oven means gas mark 2, hot oven means gas mark 6 to 7, and very hot means gas mark 8 to 9. These phrases come from cookbooks written before ovens had temperature dials.