Reheat Time Calculator

Estimate reheating time for leftovers by portion weight and method.

Usage Tip

Add a splash of water and cover to stop leftovers drying out.

Reheat Time
minutes
Until piping hot
THE MATH
time = weight ÷ 100 × minutes per 100 g
The microwave is fastest; the oven keeps texture better but takes longer.
Stir microwave portions halfway and check the centre is hot to stay food-safe.
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The calculators and tools on Formula Factory are provided for general guidance and informational purposes only. Results are estimates based on standard formulas and the values you enter — they do not constitute professional engineering, electrical, or architectural advice. Always verify calculations with a qualified professional before making decisions for any safety-critical, code-compliance, or commercial application. Formula Factory makes no representations or warranties as to the accuracy or completeness of any result, and accepts no liability for errors, omissions, or any outcomes arising from reliance on this information.