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Oven Temperature Guide — Gas Mark, Fan & Conventional

Published 9 February 2026

Converting between Celsius, Fahrenheit, Gas Mark and fan oven temperatures is one of the most common kitchen challenges — especially when following recipes from different countries. This guide gives you a comprehensive reference.

Quick tool: Need instant, interactive conversions? Use our Temperature Converter →

Complete Temperature Chart

Description°C°FGas MarkFan °C
Very cool110°C225°F¼90°C
Cool120°C250°F½100°C
Cool/Slow140°C275°F1120°C
Slow150°C300°F2130°C
Moderate160°C325°F3140°C
Moderate180°C350°F4160°C
Moderately hot190°C375°F5170°C
Moderately hot200°C400°F6180°C
Hot220°C425°F7200°C
Very hot230°C450°F8210°C
Very hot240°C475°F9220°C

Gas Mark Quick Reference

Looking up a specific gas mark? Here's a quick reference showing each gas mark with its equivalent temperatures and common uses:

Gas Mark°C°FFan °CCommon Uses
Gas Mark 1140°C275°F120°CSlow cooking, meringues, drying herbs
Gas Mark 2150°C300°F130°CSlow roasting, casseroles
Gas Mark 3160°C325°F140°CGentle baking, fruit cakes
Gas Mark 4180°C350°F160°CCakes, biscuits, sponges
Gas Mark 5190°C375°F170°CPastries, pies, roast vegetables
Gas Mark 6200°C400°F180°CRoasting meat, baking bread
Gas Mark 7220°C425°F200°CYorkshire puddings, roast potatoes
Gas Mark 8230°C450°F210°CPizza, high-heat roasting
Gas Mark 9240°C475°F220°CVery high-heat cooking, naan bread

Fahrenheit to Gas Mark

Converting American recipes? Here's a quick Fahrenheit to Gas Mark reference:

°FGas Mark°C
275°FGas Mark 1140°C
300°FGas Mark 2150°C
325°FGas Mark 3160°C
350°FGas Mark 4180°C
375°FGas Mark 5190°C
400°FGas Mark 6200°C
425°FGas Mark 7220°C
450°FGas Mark 8230°C
475°FGas Mark 9240°C

The Formulas

Celsius → Fahrenheit

°F = (°C × 9/5) + 32

Fahrenheit → Celsius

°C = (°F − 32) × 5/9

Fan Oven Conversion

Fan °C = Conventional °C − 20

Understanding Gas Marks

Gas marks are a temperature scale used on gas ovens in the UK and some Commonwealth countries. Each gas mark corresponds to a specific temperature, starting at Gas Mark ¼ (110°C) up to Gas Mark 9 (240°C). They're incrementally spaced: each whole number represents roughly a 14°C (25°F) increase.

Fan vs Conventional Ovens

Fan ovens (also called convection ovens) use a fan to circulate hot air throughout the oven. This means food cooks more evenly and often more quickly. The standard conversion rule is to reduce the temperature by 20°C when converting from a conventional recipe to a fan oven.

For example, if a recipe says “bake at 180°C”, use 160°C in a fan oven. You may also need to reduce the cooking time by about 10%.

Is Your Oven Accurate?

Most home ovens are off by 25–50°F (15–30°C). The temperature dial might say 180°C, but the actual temperature inside could be significantly different. This is one of the most common causes of baking failures.

Frequently Asked Questions

What gas mark is 180°C?▼
Gas Mark 4 is approximately 180°C (356°F). This is one of the most common baking temperatures, used for cakes, biscuits and many other recipes.
What is gas mark 5 in celsius?▼
Gas Mark 5 is approximately 190°C (375°F). In a fan oven, use 170°C. This is a moderately hot temperature, commonly used for roasting vegetables and baking pastries.
What is gas mark 5 in a fan oven?▼
Gas Mark 5 (190°C conventional) converts to 170°C in a fan oven. Fan ovens are more efficient, so you reduce the temperature by about 20°C.
What is gas mark 6 in celsius?▼
Gas Mark 6 is approximately 200°C (400°F). In a fan oven, use 180°C. This is a hot temperature used for roasting meat and baking bread.
What is 220°C in gas mark?▼
Gas Mark 7 is approximately 220°C (425°F). This is a hot oven temperature, ideal for roasting potatoes, Yorkshire puddings, and pizza.
What is 450°F in gas mark?▼
Gas Mark 8 is approximately 450°F (230°C). This is a very hot oven temperature used for high-heat roasting and bread baking.
What is the difference between fan oven and conventional oven temperatures?▼
Fan (convection) ovens circulate hot air, cooking food more evenly and efficiently. As a general rule, reduce the temperature by 20°C when using a fan oven compared to a conventional oven recipe. So 180°C conventional = 160°C fan.
What temperature is a moderate oven?▼
A moderate oven is typically 160–180°C (325–350°F), or Gas Mark 3–4. This is the temperature range used for most baking recipes.
What is gas mark 4 in centigrade?▼
Gas Mark 4 is approximately 180°C (centigrade). In a fan oven, use 160°C. This is the most common baking temperature for cakes and biscuits.
What is 400°F in gas mark?▼
Gas Mark 6 is approximately 400°F (200°C). This is a moderately hot to hot oven temperature, commonly used for roasting.

For instant interactive conversions, use our Temperature Converter. Or check our Cups to Grams Conversion Chart for ingredient weight references.