Free · Everyday planning calculators
Microwave Power-Time Ratio
Scale a stated heating duration by the ratio of two selected power ratings.
- Formula & worked example
- Private in your browser
- No signup
Calculator inputs
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How to use this calculator
- Enter the known values in the units shown. Results update as you type.
- Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
- Use the worked example to check the method. Reset restores the starting fields.
Private by default
Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.
Formula and method
Two minutes at 1,000 W scales to four minutes at 500 W under constant delivered-power assumptions.
Equivalent-energy time = original power × original time / new power
Worked example
Enter these known values and leave the other values blank.
- Wattage
- 1000 W
- For
- 2:00 min / sec
- Wattage
- 500 W
- For
- 4:0 min / sec
- T0min
- 4
- T0sec
- 0
- T1min
- 4
- T1sec
- 20
- S0min
- 2
- S0sec
- 0
- S1min
- 2
- S1sec
- 10
- T 1min
- 3
- T 1sec
- 40
- S 1min
- 1
- S 1sec
- 50
- T2min
- 4
- T2sec
- 40
- S2min
- 2
- S2sec
- 20
- T3min
- 5
- T3sec
- 0
- S3min
- 2
- S3sec
- 30
- T4min
- 5
- T4sec
- 20
- S4min
- 2
- S4sec
- 40
- T 2min
- 3
- T 2sec
- 20
- S 2min
- 1
- S 2sec
- 40
- T 3min
- 3
- T 3sec
- 0
- S 3min
- 1
- S 3sec
- 30
- T 4min
- 2
- T 4sec
- 40
- S 4min
- 1
- S 4sec
- 20
Assumptions and limitations
- This is an equal-energy arithmetic estimate. It does not certify cooking temperature, food safety or heat uniformity, and food instructions can require a different schedule. The 900 W menu value is explicitly corrected from a captured 898 W typo.
Common questions
What assumptions affect this result?
This is an equal-energy arithmetic estimate. It does not certify cooking temperature, food safety or heat uniformity, and food instructions can require a different schedule. Captured 900 W menu entries are numerically 898 W; use exact other ratings for the worked example.
Can I solve for a missing value?
Clear the missing field and enter compatible known values in the displayed units. Supported inverse branches remain available; rounding and one-way outputs keep their original direction.
References
Translate the captured scalar helper functions into pinned local arithmetic, including every presentation formula and supported inverse. Original JavaScript is retained as evidence and is not shipped. JavaScript remainder retains its sign for hidden negative table times. The menu entry labeled 900 W has a captured numeric value of 898. Pin and correct that single shared wattage dataset cell and numeric lookup entries to 900 for both power controls.
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