Battery runtime calculator
Estimate approximate battery runtime from Ah capacity, voltage, and load by power (W) or current (A). Results are indicative only.
Result is approximate — real runtime depends on battery type and conditions.
Input mode
Capacity (Ah)
Voltage (V)
Power draw (W)
Result
Runtime: 20 h
Total: 0 min
How to use
1. Enter battery capacity (Ah) and voltage.
2. Choose power or current input mode.
3. Enter load draw.
4. Read estimated runtime — approximate only.
Example
Battery runtime calculator
Estimate approximate battery runtime from Ah capacity, voltage, and load by power (W) or current (A). Results are indicative only.
When to use
• When you need a quick estimate without spreadsheets.
• When you want privacy — calculations stay on your device.
Limitations
• When you need certified engineering or legal calculations.
• When site-specific conditions require a professional survey.
About this calculator
Estimate approximate battery runtime from Ah capacity, voltage, and load by power (W) or current (A). Results are indicative only.
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Is my data uploaded?
No. All math runs locally in your browser.
Is this tool free?
Yes. No account or subscription required.