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Battery Amp-Hours

Calculate Battery Amp-Hours instantly with the exact formula and a worked example.

Battery Amp-Hours

Battery capacityAh
Load currentA
Allowed depth of discharge%
Runtime, h
8h
At high currents real runtime is shorter (Peukert effect)Lead-acid: discharge to 50 %, LiFePO4: to 80–90 %Calculate Battery Amp-Hours instantly with the exact formula and a worked example.
Runtime
8:00:00
Usable capacity
80Ah

More about: Battery Amp-Hours

What it calculates

The “Battery Amp-Hours” calculator computes Runtime, h in h from 3 parameters: battery capacity (Ah), load current (A), allowed depth of discharge (%).

A standard physics formula used in educational and engineering tasks.

Example calculation

With parameters Battery capacity = 100 Ah, Load current = 10 A, Allowed depth of discharge = 80 % the result is 8 h (At high currents real runtime is shorter (Peukert effect)).

How to use

  1. Enter battery capacity, load current and allowed depth of discharge — each field above is adjustable with a slider.
  2. Runtime, h (h) is calculated automatically as you type.
  3. Check the worked example below to see the formula applied to real numbers.
  4. Copy the result or bookmark this calculator.

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FAQ

How is Battery Amp-Hours calculated?
The Battery Amp-Hours calculator computes Runtime, h (in h) from battery capacity, load current, allowed depth of discharge. Enter your values above and the exact formula is applied instantly; a worked example with real numbers is shown below.
Is the Battery Amp-Hours calculator free?
Yes. It is completely free, needs no signup, runs entirely in your browser, and sends no data to any server.

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