Efficiency Calculator
Works out what share of the input does the useful work.
Answer
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Share sends a link that reopens these numbers. Copy details pastes the full breakdown as a list.
Efficiency — %
Useful output —
Total input —
Lost —
Reading this —
The formula
efficiency = useful output ÷ total input × 100
Both figures must use the same unit.
What to watch out for
For several stages in a chain, multiply the efficiencies together.
Frequently Asked Questions
What is the efficiency of 750 J out from 1,000 J in?
75%.
How much input gives 500 W at 80%?
625 W, with 125 W lost.