How do I measure my actual oven temperature?

Use an oven thermometer (available from most kitchen shops for a few pounds). Place it in the centre of the oven, set the oven to a known temperature (e.g., 180°C), wait 20 minutes for it to fully heat, then read the thermometer. The difference between the set temperature and the actual reading is your offset.

Is it normal for an oven to be inaccurate?

Yes, it is very common. Most domestic ovens are off by 10-25°C, and the offset can increase with age. Even new ovens may not match their dial exactly. Regular calibration with an oven thermometer helps ensure consistent baking results.

Does the offset stay the same at all temperatures?

Not always. Some ovens are more accurate at lower temperatures and less accurate at higher ones, or vice versa. Ideally, test at 2-3 different temperatures (e.g., 150°C, 180°C, 220°C) to see if the offset is consistent. This calculator assumes a constant offset.

What is the fan-to-conventional oven difference?

Fan ovens are typically 20°C lower than conventional ovens for the same cooking effect, because the fan circulates hot air more efficiently. So if a recipe says 200°C conventional, use 180°C fan. This calculator uses a default 20°C offset which you can adjust in the advanced options.

BakeCalcs

Oven Temperature Offset Calculator

Calibrate your oven temperature and calculate the correct setting for accurate baking.

Recipe Temperature

Temperature the recipe calls for

Measured Actual Temperature

What your oven thermometer reads

Oven Type

Select the oven type for your calculation

How We Calculate This

This calculator works out the difference between your oven's set temperature and the actual measured temperature. It then tells you what temperature to set your oven to in future to achieve the correct recipe temperature.

The Calculation

Offset = Actual temperature - Recipe temperature
Corrected setting = Recipe temperature - Offset
If your oven runs hot (positive offset), set it lower
If your oven runs cold (negative offset), set it higher

Frequently Asked Questions

Related Calculators

Cups to Grams Converter

Convert US cup measurements to grams for common baking ingredients.

Grams to Cups Converter

Convert gram measurements to US cups for common baking ingredients.

Tablespoons to Grams Converter

Convert tablespoon measurements to grams for common cooking and baking ingredients.

Millilitres to Fluid Ounces Converter

Convert between millilitres and UK or US fluid ounces.

Grams to Ounces Converter

Convert between grams and ounces for ingredient weights.

Last updated: March 2026

All calculations are based on standard ratios and conversions. Results may vary with specific ingredients, equipment, and conditions.