Microwave time conversion
Convert label wattage/time to your microwave’s wattage with rounding and a quick chart.
Common conversions
Result
--:--
Show chart
See a quick conversion chart for common times.
Tips & safety
- Enter the label wattage and time to get the equivalent time for your microwave.
- Results are estimates. Microwave performance varies by model, food amount and container, so adjust while watching the food.
- Round up if you want to reduce the risk of underheating.
How the conversion works (with examples)
Microwave “wattage” is power. If the same food absorbs roughly the same fraction of power, cooking time scales inversely with wattage:
your time ≈ label time × (label W / your W)
Worked examples
- 1000W → 700W: 2:00 = 120s → 120 × (1000/700) ≈ 171s → about 2:51.
- 900W → 1100W: 4:30 = 270s → 270 × (900/1100) ≈ 221s → about 3:41.
- 700W → 1200W: 1:00 = 60s → 60 × (700/1200) ≈ 35s.
When the estimate can be off
- Low-power settings: many microwaves achieve “50% power” by cycling on/off (duty cycle), which can heat less evenly than a simple time ratio.
- Food geometry: thick or dense foods often need stirring/rotation and standing time; edges can overcook while the center is still cold.
- Containers: microwave-safe glass/ceramic vs plastic and the shape/size can change heating patterns.
References
FAQ
How do I convert cooking time from 1000W to 700W?
Multiply the time by 1000/700. For example, 2:00 becomes about 2:51.
Where can I find my microwave wattage?
Check the sticker on the unit, the manual, or the manufacturer's website.
Is the conversion exact?
It is an estimate. Performance varies by model, food amount, and container, so adjust while watching the food.
Why round up the result?
Rounding up helps avoid underheating. You can change the rounding mode and step if needed.