Gas Mark

Gas Mark is a British oven temperature scale introduced in the 1940s by gas-appliance manufacturers to standardise oven dial labels. It runs from Mark 1/4 (very slow, ~225°F / 110°C) through Mark 9 (very hot, 475°F / 246°C), increasing by 25°F (~14°C) per mark above Mark 1.

The standard reference table:

• Mark 1/4 — 225°F / 110°C — very slow
• Mark 1/2 — 250°F / 120°C — very slow
• Mark 1 — 275°F / 135°C — slow
• Mark 2 — 300°F / 150°C — slow
• Mark 3 — 325°F / 165°C — moderately slow
• Mark 4 — 350°F / 180°C — moderate (the default)
• Mark 5 — 375°F / 190°C — moderate
• Mark 6 — 400°F / 200°C — moderately hot
• Mark 7 — 425°F / 220°C — hot
• Mark 8 — 450°F / 230°C — very hot
• Mark 9 — 475°F / 246°C — very hot

Gas Mark is rare in modern UK appliances (electric and induction ovens label in °C) but still common in cookbooks from before the metric transition, and in some older gas ranges. Convert any of the three scales with our oven temperature converter.