Efficiency Calculator

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Calculates the ratio of useful output energy or power to the total input energy or power, often as a percentage.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Useful Output Energy (Joules or kWh) and Total Input Energy (Joules or kWh) in the units shown.

Step 2

Read Efficiency in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Useful Output Energy (Joules or kWh): 180 J; Total Input Energy (Joules or kWh): 200 J

Efficiency: 90 %

Useful Output Energy (Joules or kWh): 100 J; Total Input Energy (Joules or kWh): 200 J

Efficiency: 50 %

Useful Output Energy (Joules or kWh): 50 J; Total Input Energy (Joules or kWh): 200 J

Efficiency: 25 %

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