If you’re working with smaller batteries, understanding how to convert milliamp hours (mAh) to watt hours (Wh) is crucial. Our mAh to Wh conversion calculator simplifies this process, allowing you to determine the power capacity of your battery with ease.
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Milliamp Hours (mAh) to Watt Hours (Wh) Conversion Formula
Milliamp hours (mAh) is a common unit used to measure the capacity of smaller batteries, while watt hours (Wh) describe the total amount of energy a battery can deliver. If you need to convert mAh to Wh, the formula is straightforward:
Conversion Formula: Watt Hours (Wh)=Milliamp Hours (mAh)×Voltage (V)1000Watt Hours (Wh)/1000
Abbreviated Formula: Wh=mAh×V1000Wh=mAh×V/1000
Example: Suppose you have a 2500mAh battery with a voltage of 3.7V. Using the formula, you can calculate the watt-hour capacity as follows:
2500mAh×3.7V÷1000=9.25Wh2500mAh×3.7V÷1000=9.25Wh
This means your battery can deliver 9.25 watt-hours of energy.
When to Convert mAh to Wh
Converting milliamp hours to watt-hours is particularly useful when you need to understand the total energy a battery can supply, especially in applications like portable electronics, power banks, and other small devices. Knowing this conversion helps in choosing the right battery for your needs, ensuring your device operates efficiently.
Understanding Milliamp Hours (mAh)
Milliamp hours represent the amount of current a battery can provide over one hour. For example, a battery with a 5mAh capacity can supply 5mA of current for one hour. If the discharge current is 1 mA, the battery would last for five hours. This capacity is often tested using a multimeter to measure the battery’s terminals and discharge voltage.
Conversion Chart: Milliamp Hours (mAh) to Watt Hours (Wh) at 3.7V
Below is a handy conversion chart for lithium batteries with a voltage of 3.7V, ranging from 1mAh to 50,000mAh:
| Milliamp Hours (mAh) | Voltage (V) | Watt Hours (Wh) |
| 1mAh | 3.7V | 0.0037Wh |
| 1,000mAh | 3.7V | 3.7Wh |
| 1,200mAh | 3.7V | 4.44Wh |
| 2,000mAh | 3.7V | 7.4Wh |
| 2,500mAh | 3.7V | 9.25Wh |
| 3,000mAh | 3.7V | 11.1Wh |
| 4,000mAh | 3.7V | 14.8Wh |
| 4,500mAh | 3.7V | 16.65Wh |
| 5,000mAh | 3.7V | 18.5Wh |
| 7,500mAh | 3.7V | 27.75Wh |
| 8,800mAh | 3.7V | 32.56Wh |
| 10,000mAh | 3.7V | 37Wh |
| 15,000mAh | 3.7V | 55.5Wh |
| 20,000mAh | 3.7V | 74Wh |
| 25,000mAh | 3.7V | 92.5Wh |
| 30,000mAh | 3.7V | 111Wh |
| 50,000mAh | 3.7V | 185Wh |