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Battery Runtime Calculator

Calculate battery runtime with clear inputs, formula guidance, and practical result checks.

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Calculator Details

CategoryConstruction

Inputs4

UseFree

RunsIn your browser

Before You Calculate

Confirm the value for Battery capacity (Ah).
Confirm the value for Battery voltage (V).
Confirm the value for Load power (W).
Confirm the value for Efficiency (%).

Why You Can Trust It

Calculations run instantly in your browser. Your entries aren't sent to or stored on a server.

Written By

Robert Threadgill
Founder

Founder of Simple Calculator Tools. Builds and tests every calculator on this site personally before publishing.

Battery capacity (Ah)

Battery voltage (V)

Load power (W)

Efficiency (%)

Result

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