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Battery energy calculator

Use the nominal voltage and capacity from the same battery’s documentation. The result is an energy calculation, not a promise of tool runtime or compatibility.

How the calculation works

Energy per pack (Wh) = nominal voltage (V) × capacity (Ah). Total stored energy = energy per pack × number of identical packs.

Use the result with care

A collection of packs is not a wiring instruction. This does not say whether packs can be connected or used in a particular tool. Usable energy and runtime depend on the equipment, load and conditions. Do not substitute a peak or marketing voltage for nominal voltage.

Your figures stay in this page

The calculation runs in your browser. These entries are not sent to a calculator service or saved by this tool. Reset returns the form to its starting values.