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Battery Life Calculator
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Calculate battery runtime from mAh and current draw with efficiency factor. Presets: smartphone, laptop, power bank, car battery. Power-to-current converter. Solar charging tab.
How to Use
- 1Click a device preset or enter battery capacity (mAh or Ah) and voltage
- 2Enter the device current draw (mA or A) - or use the Power tab to convert from watts
- 3Adjust the efficiency factor (default 85%) for real-world losses
- 4Click Calculate Battery Life to see runtime in hours and minutes, Wh, and kJ
- 5Solar Charging tab: enter panel wattage, sun hours, and efficiency to estimate charge time
Features
- Runtime from mAh/Ah and current draw (mA/A) with efficiency factor
- Device presets: smartphone, laptop, power bank, car battery
- Energy in watt-hours (Wh) and kilojoules (kJ)
- Power-to-current converter (W + V → A)
- Solar charging time estimate (panel watts + sun hours)
- 100% browser-based
Frequently Asked Questions
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