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UPS Runtime from Battery Capacity and Load Calculator

Minutes of backup power from battery Ah and load W.

Estimates UPS runtime: time(min) = (battery_Ah × V_battery × efficiency × DoD) / load_W × 60. Peukert effect is approximated by reducing Ah by ~20% at high load.

Nadia Almasri By Nadia Almasri
Published Last reviewed 1 min read

Inputs

Ah
V
W

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

time_min = (Ah × V × η × DoD / load_W) × 60

In depth

Estimates UPS runtime: time(min) = (battery_Ah × V_battery × efficiency × DoD) / load_W × 60. Peukert effect is approximated by reducing Ah by ~20% at high load.