Oven Temperature Converter (°F, °C, Gas Mark)
Convert oven temperatures between Fahrenheit, Celsius, and Gas Mark, with common recipe presets included.
Reviewed by Daniel Agrici, Founder & Lead Developer
Formula
Celsius = (Fahrenheit - 32) x 5/9 | Gas Mark = (Fahrenheit - 250) / 25
The Fahrenheit to Celsius formula subtracts the offset of 32 degrees and multiplies by the ratio 5/9 to convert between the two scales. Gas Mark is a British scale where Mark 1 equals 275F and each mark adds 25F. Convection ovens run about 25F hotter effectively, so reduce the set temperature by 25F.
Worked Examples
Example 1: Converting a British Recipe
Problem:A British recipe calls for Gas Mark 6. What Fahrenheit and Celsius temperatures should you use?
Solution:Gas Mark to Fahrenheit: 250 + (6 x 25) = 400F\nFahrenheit to Celsius: (400 - 32) x 5/9 = 204C\nFan oven adjustment: 400 - 25 = 375F conventional equivalent\nHeat level: Hot\nCommon uses: Roast chicken, vegetables, quick breads
Result:Gas Mark 6 = 400F = 204C (375F in a fan/convection oven)
Example 2: Adjusting for Convection Oven
Problem:A recipe calls for baking at 375F in a conventional oven. What temperature should be set for a convection (fan) oven?
Solution:Conventional temperature: 375F\nConvection adjustment: subtract 25F\nConvection setting: 375 - 25 = 350F\nIn Celsius: (350 - 32) x 5/9 = 177C\nAlso consider reducing cooking time by 10-15%
Result:Set convection oven to 350F (177C) and check doneness 10-15% earlier.
Frequently Asked Questions
How do I convert Fahrenheit to Celsius for oven temperatures?
To convert Fahrenheit to Celsius, subtract 32 from the Fahrenheit temperature and then multiply by 5/9. For example, 350F becomes (350 - 32) x 5/9 = 318 x 0.5556 = 176.7C, which is typically rounded to 175C or 180C for oven use. The most common oven temperature conversions to remember are 325F equals 165C, 350F equals 175C, 375F equals 190C, 400F equals 200C, and 425F equals 220C. For quick mental math, you can subtract 30 and divide by 2 for a rough estimate: (350 - 30) / 2 = 160C, which is close enough for most cooking purposes though not perfectly precise.
What is Gas Mark and how does it relate to Fahrenheit and Celsius?
Gas Mark is a temperature scale used primarily in the United Kingdom and some Commonwealth countries for gas ovens. Gas Mark 1 corresponds to 275 degrees Fahrenheit or 140 degrees Celsius, and each subsequent mark increases by 25 degrees Fahrenheit. So Gas Mark 4 equals 350F or 175C, Gas Mark 5 equals 375F or 190C, and Gas Mark 6 equals 400F or 200C. There is also a half mark at Gas Mark 0.5, which equals approximately 250F or 120C. British and Australian recipes commonly use Gas Mark, so if you are following a recipe from these regions and have a Fahrenheit or Celsius oven, conversion is essential for achieving the correct cooking temperature and results.
What is the difference between conventional and fan/convection oven temperatures?
Fan or convection ovens circulate hot air with an internal fan, which distributes heat more evenly and cooks food faster than conventional ovens. Because of this improved heat distribution, you should reduce the temperature by about 25 degrees Fahrenheit or 15 degrees Celsius when converting from a conventional recipe to a fan oven. For example, if a recipe calls for 375F in a conventional oven, set your fan oven to 350F instead. Additionally, cooking times may be reduced by 10 to 15 percent in a convection oven. Not making this adjustment results in overcooked, dried-out food because the effective cooking temperature is higher than intended by the recipe author.
What oven temperature should I use for baking bread?
Most bread recipes call for oven temperatures between 375F and 450F (190C to 230C), depending on the type of bread being baked. Lean breads like French baguettes and sourdough boules bake best at higher temperatures of 425F to 475F, which creates a crispy, well-browned crust through the Maillard reaction. Enriched breads containing butter, eggs, or sugar like brioche and challah bake at lower temperatures of 325F to 375F to prevent the sugars from burning before the interior is fully cooked. Sandwich bread and dinner rolls typically bake at 375F to 400F as a middle ground. Starting at a high temperature for 10 to 15 minutes and then reducing the heat is a common technique for artisan loaves.
References
Reviewed by Daniel Agrici, Founder & Lead Developer · Editorial policy