Wh to mAh Calculator

In today’s world, where portable electronic devices have become an integral part of our lives, understanding battery capacity is essential. Whether it’s your smartphone, laptop, or power bank, knowing how much power your battery can hold and how to measure it accurately can help you manage your devices more efficiently. One common challenge users face is converting between different units of battery capacity, such as watt-hours (Wh) and milliampere-hours (mAh). Fortunately, Wh to mAh calculators come to the rescue, simplifying this process and providing users with a convenient tool for quick conversions.

What is a Wh to mAh Calculator?

A Wh to mAh calculator is a tool used to convert battery capacity from watt-hours to milliampere-hours and vice versa. These units represent different aspects of a battery’s capacity:

  • Watt-hours (Wh): This unit measures the total energy capacity of a battery over time. It is calculated by multiplying the voltage (V) of the battery by the current (in amperes, A) it can supply for one hour.
  • Milliampere-hours (mAh): This unit measures the amount of current a battery can deliver over time. It is commonly used to express the capacity of smaller batteries, such as those found in smartphones, tablets, and other portable devices.

Converting between these units is essential for comparing battery capacities across different devices or when selecting a replacement battery with similar performance characteristics.

How Does a Wh to mAh Calculator Work?

Wh to mAh calculators operate based on a simple formula derived from the fundamental relationship between power (W), voltage (V), current (I), and time (t):



  • P represents power in watts (W),
  • V represents voltage in volts (V),
  • I represents current in amperes (A).

To convert watt-hours (Wh) to milliampere-hours (mAh), the following formula is commonly used:




  • �ℎWh represents watt-hours,
  • �ℎAh represents ampere-hours (Ah),
  • ��ℎmAh represents milliampere-hours,
  • V represents voltage.

Benefits of Using a Wh to mAh Calculator:

  1. Convenience: Wh to mAh calculators provide a quick and easy way to convert battery capacities without the need for manual calculations.
  2. Accuracy: By using precise formulas, these calculators ensure accurate conversions between different units of battery capacity.
  3. Compatibility: Users can compare battery capacities across devices with different voltage ratings, enabling better decision-making when selecting batteries or portable power sources.
  4. Versatility: Wh to mAh calculators can be used for various battery-powered devices, including smartphones, laptops, cameras, and power banks.

How to Use a Wh to mAh Calculator:

Using a Wh to mAh calculator is straightforward. Here are the typical steps:

  1. Enter Known Values: Input the known values into the calculator, such as the watt-hours (Wh) or voltage (V) of the battery.
  2. Select Conversion Direction: Choose the direction of conversion, i.e., from Wh to mAh or vice versa.
  3. Obtain Result: The calculator will then provide the converted value, either in milliampere-hours (mAh) or watt-hours (Wh), depending on the selected conversion.
  4. Interpret the Result: Interpret the result to understand the battery capacity in the desired unit.


Wh to mAh calculators serve as invaluable tools for anyone dealing with battery-powered devices. Whether you’re a consumer comparing battery capacities or a technician selecting the right battery for a device, these calculators simplify the conversion process and ensure accurate results. By understanding how to use them effectively, users can make informed decisions regarding battery usage, replacement, and management, ultimately enhancing the efficiency and performance of their electronic devices.