The dial lies
Most home ovens run 25–50°F (15–30°C) hotter or cooler than the dial says, and almost all have hot spots — areas that cook faster than others. The thermostat also cycles the heat on and off, so the real temperature swings around the set point. None of this shows on the dial.
How to check your oven
- Put an inexpensive oven thermometer in the center and preheat fully (15–20 minutes).
- Compare its reading to the dial. If it reads 25°F low, set the dial 25°F higher to compensate.
- Check a few positions to find hot spots — back corners are often hottest.
- Re-check occasionally; ovens drift over time.
An oven thermometer costs very little and is the fastest way to fix mystery baking failures.
Working around an uneven oven
- Rotate pans 180° halfway through to even out hot spots.
- Bake on the middle rack unless a recipe says otherwise.
- If one side always browns first, turn the tray; if bottoms burn, move up a rack or double the tray.
- Use internal temperature to judge doneness, not just the timer.
Remember fan/convection ovens cook hotter still — if yours has a fan, also reduce the recipe temperature by about 20°C (25°F).