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Battery Runtime Calculator

Estimate runtime from nominal energy and a usable-capacity allowance. Battery chemistry, temperature and current-dependent losses are not modelled.

Enter your values

V
Ah
W
%

Use a decimal point, without thousands separators.

Example result
Runtime
9.6 h

The initial result uses the example values. Enter your own values and calculate again.

Edit inputs

How it works

Estimate runtime from nominal energy and a usable-capacity allowance. Battery chemistry, temperature and current-dependent losses are not modelled.

hours = V × Ah × usable fraction / W

Worked example

Show example inputs and result

Battery voltage: 12 · Capacity: 100 · Load power: 100 · Usable capacity: 80.

Runtime
9.6 h

Questions and answers

Why are some results rounded?

Results display up to 8 decimal places. Calculations use the unrounded values; very small values use scientific notation. JavaScript floating-point arithmetic can introduce tiny rounding differences.

Are my inputs sent to a server?

The calculator processes inputs in your browser. Its code does not send your values to a server.

Method reviewed: October 8, 2026 · Methods & accuracy

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