Wh to mAh Calculator

Milliampere-hours (mAh):



In the world of electronics and power management, understanding the relationship between watt-hours (Wh), voltage (volts), and milliampere-hours (mAh) is essential. Whether you’re working on a DIY project, calculating battery life for a device, or optimizing power consumption, the conversion from watt-hours to milliampere-hours is a crucial step. In this guide, we’ll explore how to use the formula for this conversion, provide examples, answer frequently asked questions, and offer a convenient HTML code for a Wh to mAh calculator. Let’s dive in!


Converting watt-hours (Wh) to milliampere-hours (mAh) can be done using the formula:


  • is the milliampere-hours.
  • is the watt-hours.
  • is the voltage in volts.

How to Use Wh to mAh Calculator

To convert Wh to mAh, follow these steps:

  1. Input the value of Wh (watt-hours).
  2. Input the voltage (volts).
  3. Apply the formula:
  4. Calculate the milliampere-hours (mAh).


Let’s say you have a 10 Wh battery with a voltage of 3.7 volts. Using the formula:


So, a 10 Wh battery at 3.7 volts is approximately equivalent to 2702.70 mAh.

FAQs (Frequently Asked Questions)

Q1: Why do we need to convert Wh to mAh?

Converting Wh to mAh is helpful when dealing with battery capacity and power consumption. It allows you to express energy storage in a more practical unit (mAh) for devices that use a specific current.

Q2: What if I have mAh and want to convert it to Wh?

You can reverse the formula: . It converts mAh back to Wh, given voltage.

Q3: Is this formula applicable to all batteries?

Yes, the formula is generally applicable to most batteries, assuming a constant voltage. However, real-world battery behavior may vary.

Q4: Can I use this formula for alternating current (AC) circuits?

This formula is primarily designed for direct current (DC) circuits. For AC circuits, additional considerations may be needed.


Converting watt-hours to milliampere-hours is a valuable skill in electronics and power management. By using the formula mAℎ=Wℎ×1000/V, you can accurately determine the capacity of a battery in milliampere-hours based on its watt-hour rating and voltage. This guide has provided you with the necessary knowledge, an example, and answers to common questions to make this conversion straightforward. For added convenience, below is the HTML code for a Wh to mAh calculator.

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