I suspect that my - fairly new - oven gets too hot, so I bought an oven thermometer, which confirmed this. So I called the supplier. They say that in order to obtain the correct actual oven temperature, for any setting, you take the highest reading on the thermometer, and the lowest, and then divide both readings. Is this correct?

1 Answer 1


The "correct" temperature is determined by using a properly calibrated thermometer. This will likely not match the 'setting' which you have dialed up on your stove because oven thermostats are notoriously unreliable. You should be able to arrive a correlation between the setting you use and watching the thermometer you bought. Remember that each time you open the oven a significant amount of heat is lost.

If you can place the thermometer where you can read it through a window into your oven and make note of the setting/actual you should be able to arrive at a useful guide to your oven.

That said, there is often very little difference between cooking something at 325F vs. 335F. But I would recommend you depend on time@temp less than internal temperature (using an instant read thermometer) to correctly gauge the 'doneness' of your dish.

  • Thanks, Cos. Reason why I am apprehensive about the response by the oven supplier is that my thermometer reading fluctuates (I bought a reputable German product). If, e.g., I set the temperature to 170°C - I'm from South Africa; we are using metrics - then my thermometer may move up to 185°C, then down to 165°C, then up again..... If this is 'normal', as the oven supplier insists, how would I know what the true temperature is I am baking at?
    – Clara
    Commented May 19, 2012 at 19:11
  • 4
    @Clara: Oven temperature always "fluctuates" - the heating element is sometimes on, sometimes off, keeping it in the neighborhood of the right temperature. 20C is a bit more than I'd expect, though, unless your thermometer is very close to the element.
    – Cascabel
    Commented May 20, 2012 at 1:50
  • Oh, ok then. So that fluctuation IS normal! Thanks, Jefromi! Clara
    – Clara
    Commented May 20, 2012 at 20:17

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