Calculate Battery Capacity
How to Calculate Battery Capacity: The Ultimate Guide
Battery capacity is a crucial factor to consider when choosing a power source for your devices. Understanding how to calculate battery capacity ensures you have enough power to last through your activities, preventing unexpected power outages…
- Enter the power consumption of your device in watts (W).
- Enter the time you need the battery to last in hours (h).
- Click the ‘Calculate’ button.
- View your results in the ‘Results’ section.
- Interpret the chart for a visual representation of your battery usage.
The formula to calculate battery capacity is:
Capacity (Ah) = Power (W) × Time (h) / Voltage (V)
Our calculator uses this formula, with a default voltage of 3.7V (common for lithium-ion batteries).
| Device | Power (W) | Time (h) | Capacity (Ah) |
|---|---|---|---|
| Laptop | 65 | 4 | 10.8 |
| Smartphone | 5 | 8 | 10.8 |
- Consider using a higher voltage battery for increased capacity.
- Battery capacity decreases with age and use. Account for this in your calculations.
What if my device uses more power than expected?
You may need to increase your battery capacity or use a higher voltage battery.
Can I use this calculator for solar panels?
Yes, you can. Just enter the power consumption of your device and the number of hours you want the solar panel to supply power.