calculators
Battery Runtime Calculator
Estimate battery runtime from nominal capacity, load, depth of discharge, and system efficiency.
Quick answer
Battery Runtime Calculator is a free online tool that helps you estimate battery runtime from usable capacity. Estimate battery runtime from nominal capacity, load, depth of discharge, and system efficiency.
Battery Runtime Calculator FAQ
How is runtime calculated?
Available Wh = nominal battery Wh x depth of discharge x efficiency. Runtime (hours) = available Wh / load W.
Why include depth of discharge?
Depth of discharge estimates the usable share of nominal battery capacity. Battery chemistry, age, and manufacturer limits should be checked separately.
Does temperature affect runtime?
Yes. Batteries lose capacity in extreme cold or heat. This calculator does not account for temperature effects.