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Battery Runtime Calculator (Wh / Watts)

Simple Wh-based battery runtime: given a battery in watt-hours and a load in watts, compute how long it will run. Use for portable power stations (Jackery, EcoFlow, Anker) and spec-sheet sizing.

Battery Capacity (Wh)

Device Load (watts)

System / Inverter Efficiency (%)

Usable Capacity (%)

Limitations: Assumes a steady load. Motor surges, inverter idle draw, and battery-chemistry de-rating are not modeled. Lithium power stations can typically use 95–100% of rated capacity; lead-acid should use 50–80%.

What to do next: Portable power stations are spec'd in Wh directly (e.g. "1000 Wh Jackery"). For deep-cycle battery banks in Ah, use the Battery Runtime Estimator — that tool asks for voltage + Ah separately.