Battery Depth of Discharge Calculator
Enter the battery capacity and depth of discharge to get the usable capacity.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
Depth of discharge (DoD) is the percentage of a battery's total capacity that has been used, and usable capacity = total capacity × DoD%, with the remainder held in reserve. Discharging beyond the recommended DoD accelerates degradation and shortens cycle life, which is why manufacturers specify a safe maximum for each chemistry.
The safe DoD varies sharply by battery type: flooded lead-acid batteries are typically limited to 50% DoD, while lithium-ion (including LiFePO4) can regularly handle 80–100% DoD. Solar and off-grid system designers use this calculator to size a battery bank so the usable capacity — not the nameplate capacity — meets actual energy needs.
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