PowerUseLab
FREE · NO SIGNUP · TRANSPARENT MATH

Battery Runtime Calculator

Estimate how long your battery will run a load without hiding the assumptions.

Your setup

PLANNING ESTIMATE
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Start with a real use case

100Ah LiFePO4How long will a 100Ah battery last?Starlink MiniUse Starlink's published 20–40 W typical range.Trolling motorCalculate from battery Ah and current draw.

Method

Runtime is based on nominal energy, usable depth of discharge, conversion efficiency and a planning reserve. Temperature, age, BMS limits and real load can change the result.