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Open toolEfficiency Calculator
Calculate energy efficiency as useful output / input × 100%. Useful output cannot exceed input; energies measured over the same process.
Free to useNo sign-upRuns in your browser
Enter your details
Enter the inputs, then select Calculate.
Your result
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Result will appear here
How Efficiency Calculator works
Calculate energy efficiency as useful output / input × 100%.
Useful output cannot exceed input; energies measured over the same process. Inputs and results use floating-point numbers and may be rounded. Results show up to 12 significant digits.
How to use Efficiency Calculator
Follow the labelled inputs.
Enter useful output energy (j)
Replace the example with useful output energy (j). The field labels specify the expected format and units.
Input and settings
Check the remaining inputs
Set input energy (j). Useful output cannot exceed input; energies measured over the same process.
Tool result
Run, review and save
Select Calculate. Review the calculated result, then copy it or download the result text.
Review the details
Examples and uses for Efficiency Calculator
Check the supplied example
The starting example produces 80%. Calculate energy efficiency as useful output / input × 100%.
Use your own inputs
Read the labels for useful output energy (j) and input energy (j). Useful output cannot exceed input; energies measured over the same process.
Record a reviewed result
Copy the calculated result into your notes. Keep the formula and assumptions with it if someone else needs to reproduce the calculation.
How to read the result
Read the units and assumptions with the output.
Calculate energy efficiency as useful output / input × 100%.
Useful output cannot exceed input; energies measured over the same process. Inputs and results use floating-point numbers and may be rounded. Results show up to 12 significant digits.
Supported input and limits
Check the stated scope before you run it.
Useful output cannot exceed input; energies measured over the same process. Inputs and results use floating-point numbers and may be rounded. Results show up to 12 significant digits.
The input stays in this browser. Copy result and Download save the same displayed text.
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Open toolEfficiency Calculator: common questions
Answers about using Efficiency Calculator and understanding its results.
What inputs and assumptions apply?
Useful output cannot exceed input; energies measured over the same process. Inputs and results use floating-point numbers and may be rounded. Results show up to 12 significant digits.
How can I save the result?
Copy result copies the displayed text. Download saves the same text as a TXT file. Processing runs in this browser without an account.
Calculate with your input
Check the calculated result, then copy or download it.