Oven Temperature Conversion
Calculator

The standard formula (°C = (°F-32) x 5/9) works fine and is what this calculator uses, but oven dial markings are often rounded to common increments (350°F becomes 175°C or 180°C depending on the manufacturer), so a converted recipe temperature may need rounding to the nearest practical dial setting.

Fan ovens circulate heat more efficiently and cook hotter at the same dial setting than a conventional oven, so recipes written for conventional ovens are commonly reduced by about 20°C (25°F) or the cooking time is shortened when using a fan oven at the stated temperature.

UK gas marks are a separate numbering scale, not a direct unit conversion, so they follow a lookup table rather than an equation; gas mark 4 corresponds to about 350°F/180°C, and the increments between gas marks aren't evenly spaced in Fahrenheit or Celsius.

This calculator only converts between temperature scales; altitude adjustments are a separate consideration, since baking at high elevation often needs an oven temperature increase alongside other recipe changes (like more liquid or less leavening) to counteract faster moisture loss and different air pressure.

Many home ovens are miscalibrated by 15-25°F/10-15°C from their dial setting, so even a perfectly converted temperature can produce different results than expected; using an independent oven thermometer is the only way to confirm your oven's actual temperature matches the setting.