Oven Temperature Guide: Celsius, Fahrenheit & Gas Mark Conversions

Oven Temperature Guide: Celsius, Fahrenheit & Gas Mark Conversions

Posted by Briscoes on 21st Jul 2026

Oven Temperature Guide: Celsius, Fahrenheit & Gas Mark Conversion Chart

Whether you're baking a homemade cake, roasting a Sunday dinner or trying a recipe from overseas, getting your oven temperature right is the key to perfect results.

Many recipes use different temperature scales, with some written in Celsius, others in Fahrenheit, while older recipes may even use Gas Mark. This handy guide from Briscoes.ie will help you quickly convert between all three, so you can cook with confidence every time.

Whether you're using a NEFF, Bosch, Miele, Whirlpool, Hotpoint, Electrolux, Beko, Samsung or Indesit oven, accurate temperatures are essential for consistently delicious results.

Why Oven Temperature Matters

Even a difference of 10°C can affect the outcome of your cooking.

Too hot and cakes can burn before the centre has cooked. Too cool and pastries may not rise properly, while meat can take much longer to cook.

If you're following an American recipe or using an older cookbook, you'll often need to convert temperatures before you begin.

Oven Temperature Conversion Chart

Celsius Fahrenheit Gas Mark
120°C 250°F ½
140°C 275°F 1
150°C 300°F 2
160°C 325°F 3
170°C 340°F 3
180°C 350°F 4
190°C 375°F 5
200°C 400°F 6
220°C 425°F 7
230°C 450°F 8
240°C 475°F 9

Bookmark this page so you'll always have the conversion chart to hand whenever you're cooking.

How to Convert Fahrenheit to Celsius

Many recipes from the USA use Fahrenheit instead of Celsius.

Use this simple formula:

(°F − 32) × 5 ÷ 9 = °C

Example

350°F

↓

350 − 32 = 318

318 × 5 = 1590

1590 ÷ 9 = 176.7°C

Rounded up, 350°F is approximately 180°C.

How to Convert Celsius to Fahrenheit

Need to convert temperatures the other way?

Use this formula:

(°C × 9 ÷ 5) + 32 = °F

Example

180°C

↓

180 × 9 = 1620

1620 ÷ 5 = 324

324 + 32 = 356°F

So 180°C is approximately 356°F.

Understanding Gas Mark

Gas ovens use numbered settings instead of temperatures.

Here's a quick guide:

  • Gas Mark 3 = 160°C
  • Gas Mark 4 = 180°C
  • Gas Mark 5 = 190°C
  • Gas Mark 6 = 200°C
  • Gas Mark 7 = 220°C

If you're ever unsure, simply refer back to the conversion chart above.

Tips for Better Baking

Always Preheat

Allow your oven to reach the correct temperature before adding your food.

Use the Correct Shelf

  • Top shelf – Browning and grilling
  • Middle shelf – Cakes, biscuits and everyday baking
  • Lower shelf – Roasting meat and casseroles

Keep the Door Closed

Opening the oven door too often lets heat escape and can increase cooking times.

Fan Oven?

Most fan-assisted ovens cook more efficiently.

As a general rule, reduce the temperature by around 20°C when converting a conventional oven recipe.

Example:

  • Conventional Oven – 200°C
  • Fan Oven – 180°C

Looking for a New Oven?

Whether you're upgrading your kitchen or replacing an older appliance, Briscoes.ie stocks an extensive range of built-in ovens and freestanding cookers from leading brands including NEFF, Bosch, Miele, Whirlpool, Hotpoint, Electrolux, Samsung, Beko and Indesit. Browse our range to find everything from multifunction ovens and pyrolytic self-cleaning models to smart connected appliances.

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