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Oven Temperature Converter

Convert oven temperatures.

How it is calculated

Choose the scale of the number you have (Celsius, Fahrenheit or gas mark) and enter the value. Everything is first converted to Celsius: from Fahrenheit °C = (°F − 32) × 5/9, from gas mark 1–10 °C = (25 × mark + 250 − 32) × 5/9; gas mark ¼ (enter 0.25) is 225 °F and ½ (enter 0.5) is 250 °F. Then °F = °C × 9/5 + 32. The gas mark is found by (°F − 250) ÷ 25, rounded to the nearest whole number; temperatures from 212 °F up to about 237 °F show ¼ and up to about 262 °F show ½.

All three results are rounded to whole numbers. Because a gas mark is a coarse step of 25 °F, converting a temperature to a gas mark and back will not return exactly the same value. The tool applies the same formula for any value, so it does not warn you if the temperature is far outside a normal oven range. Only the gas result reacts: below 212 °F (100 °C) or far above gas mark 10 it shows “—”, and a gas mark entered below ¼ or above 10 gives no result.

Worked example

A recipe says 350 °F. Subtract 32: 318. Multiply by 5/9: 176.7, which rounds to 177 °C. Fahrenheit stays at 350 °F. For the gas mark, (350 − 250) ÷ 25 = 4, so use gas mark 4. Note that many cooks round 177 °C to 180 °C; the exact conversion of 180 °C is 356 °F.

Try this example →

Common mistakes

  • Leaving the scale on Celsius while typing a Fahrenheit number. 350 read as Celsius is far beyond any home oven.
  • Treating gas mark as a temperature to be typed in the Celsius field. Select the gas option first.
  • Forgetting fan ovens run hotter. Fan settings are usually lower than the recipe figure, and this tool does not adjust for that.
  • Expecting a gas mark for very low or very high temperatures. Below 212 °F (100 °C), or far above gas mark 10, the gas result is “—”; ¼ and ½ are the lowest marks.
  • Assuming rounding is lossless: 177 °C and 180 °C are both gas mark 4.

About this calculator

This converter switches an oven temperature between Celsius, Fahrenheit, and UK/Australian gas mark numbers, so a recipe written for one kind of oven makes sense on yours.

Home cooks use it constantly when following recipes from another country — a British recipe calling for gas mark 4, an American one giving Fahrenheit, or a European one in Celsius — without having to memorize or look up the conversion table every time.

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Comments (1)

  • Editorial team

    Gas marks ¼ and ½ are supported: ¼ is 225 °F (107 °C) and ½ is 250 °F (121 °C), and marks 1 to 10 follow from 275 °F. Below 212 °F (100 °C) or far above gas 10 the gas result shows a dash. Dial readings can also differ from the real oven temperature, so an inexpensive oven thermometer is a worthwhile check. Is your oven fan or conventional? Tell us what adjustment you apply to recipes.

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