basic

Microwave Time Power Conversion Calculator

t_new = t_old · (W_old / W_new).

Adjust a recipe's microwave time when your microwave's wattage differs from the wattage the recipe was written for: t_new = t_old · (W_old / W_new). Heat input is roughly proportional to power, so a lower-wattage oven needs more time and vice-versa. Reports the new time in seconds and minutes:seconds.

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

s
W
W

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

t_new = t_old · (W_old / W_new).

In depth

Adjust a recipe's microwave time when your microwave's wattage differs from the wattage the recipe was written for: t_new = t_old · (W_old / W_new). Heat input is roughly proportional to power, so a lower-wattage oven needs more time and vice-versa. Reports the new time in seconds and minutes:seconds.