Gas mark 1/2
130°C · 250°F · 110°C fan
Very cool oven — very slow braises, overnight cooking.
Gas mark 1/2 in every scale
| Gas mark | 1/2 |
| Fahrenheit | 250°F (exact — gas mark 1/2 is defined as this) |
| Celsius, conventional oven | 130°C (the arithmetic conversion is 121.1°C; recipes round it) |
| Celsius, fan oven | 110°C |
| Fahrenheit, fan oven | 230°F |
| Description | Very cool |
Frequently asked questions
What is gas mark 1/2 in Celsius?
130°C in a conventional oven, or 110°C in a fan oven.
What is gas mark 1/2 in Fahrenheit?
250°F, exactly — gas mark 1/2 is defined as 250°F.
Why is gas mark 1/2 called 130°C when 250°F is 121.1°C?
Because 121.1°C is not a number an oven dial can be set to. Recipes round to the nearest ten, and the rounded figure is the convention everywhere — the 8.9 degree difference is well inside the accuracy of a domestic thermostat.
What is gas mark 1/2 used for?
Very cool — very slow braises, overnight cooking.
The settings either side
| Gas mark | Fahrenheit | Celsius | Fan / convection | |
|---|---|---|---|---|
| 1/4 | 225°F | 110°C | 90°C fan | Very cool |
| 1/2 | 250°F | 130°C | 110°C fan | Very cool |
| 1 | 275°F | 140°C | 120°C fan | Cool |
The full chart, and why the three scales disagree →
The other gas marks
- Gas mark 1 — 140°C, 275°F
- Gas mark 2 — 150°C, 300°F
- Gas mark 3 — 170°C, 325°F
- Gas mark 4 — 180°C, 350°F
- Gas mark 5 — 190°C, 375°F
- Gas mark 6 — 200°C, 400°F
- Gas mark 7 — 220°C, 425°F
- Gas mark 8 — 230°C, 450°F
All oven temperatures · 130°C to °F precisely · Cooking measurements