Battery Runtime Estimator

Estimate how long a battery will last based on capacity and power draw.

Capactiy Unit

Battery Capacity

Battery Voltage (V)

Device Power Draw (Watts)

Note

This calculation assumes ideal conditions. Real-world battery life is often 10-15% less due to efficiency losses (inverter efficiency, heat, etc.).

Features

Estimate how long a battery will run a specific load.
Supports capacity inputs in mAh, Ah, or Wh.
Calculates runtime in Hours and Minutes.

How to Use

Select your battery capacity unit (mAh, Ah, or Wh).
Enter the capacity value.
If using mAh or Ah, enter the battery voltage (V).
Enter the power consumption of your device in Watts.
Click "Calculate Runtime" to see the estimate.