Watt to mAh Calculator

Convert power (Watt) to battery capacity (mAh) based on voltage and time

Input Parameters

Calculation Results

Calculation Formula

mAh = (Power × Time × 1000) / Voltage

Where:
Power = Power output in Watts
Time = Duration in hours
Voltage = Battery voltage in Volts

Result (mAh)

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Watt to mAh Calculator Calculator Usage Guide

Learn how to use the Watt to mAh Calculator and its working principles

How to Use This Calculator

  1. Enter the power output in Watts (W)
  2. Enter the battery voltage in Volts (V)
  3. Enter the duration in hours (h)
  4. Click the "Calculate" button to get the battery capacity in mAh

Working Principle

The calculator uses the formula:
mAh = (Power × Time × 1000) / Voltage

This formula converts power (Watt) to battery capacity (mAh) by considering the voltage and time. The multiplication by 1000 converts the result from Ampere-hours to milliampere-hours (mAh), which is the standard unit for battery capacity.

Example

If you have a device that uses 5 Watts of power and operates for 2 hours on a 3.7V battery, the battery capacity would be:
mAh = (5 W × 2 h × 1000) / 3.7 V ≈ 2702.70 mAh

Applications

This calculator is useful for:

  • Estimating battery capacity needed for portable devices
  • Comparing different power sources
  • Understanding power consumption of various electronics