Microwave Wattage Converter Calculator

Convert recipe times across microwave models with confidence. Enter original wattage power level and cooking time then choose your target wattage. See adjusted time energy ratio explanation and tips for common ovens. Export your results to CSV or PDF. Built for accuracy speed and effortless kitchen work. Works offline in one responsive white theme.

Convert Time Between Wattages
Adjust a recipe time from one microwave power to another
Linear energy ratio
W
Typical: 600–1200 W
W
Your oven’s rated power
%
If recipe used reduced power
%
Your oven’s selected power
Use colon-separated format. Seconds are optional.
CSV PDF
Adjusted time
—
Ratio —
Quick presets
1100→700 for 2:30 1000→700 for 3:00 900→1200 for 1:45 800→1000 for 4:20
Formula used
Why the conversion works

Microwaves deliver energy roughly in proportion to their effective power. To achieve the same energy dose, time scales with the inverse of effective power. 

Ttarget = Toriginal × (Poriginal / Ptarget)

Where effective power P = rated_wattage × power_level_fraction

Thus:
Ttarget = Toriginal × 
  (Worig × (PLorig/100)) / (Wtgt × (PLtgt/100))

Real ovens vary by efficiency and cavity design. Use the result as a best estimate, then check food temperature and texture; adjust in small increments as needed.

Example data & your logs
Preset conversions plus every calculation you run
# Orig W Orig % Target W Target % Orig Time Ratio Adjusted Time Timestamp
1 1100 100% 700 100% 2:30 × 1.571 3:56
2 1000 80% 700 100% 5:00 × 1.143 5:43
Tip: Click “Add common examples” for more presets you can export.

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Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.