mWh to mAh Calculator
Enter energy in mWh and voltage in V to convert to mAh.
If you work with batteries, power banks, laptops, or solar systems, you’ll often need to convert mWh (milliwatt-hours) to mAh (milliamp-hours). This calculator gives you a quick answer and shows the exact formula so you can verify every step.
What is the difference between mWh and mAh?
mWh measures energy capacity. It tells you how much total energy a battery stores.
mAh measures electric charge capacity. It tells you how much current can be delivered over time.
Because these units are not the same type, you must include voltage when converting.
mWh to mAh formula
Use this equation:
mAh = mWh ÷ V
- mWh = battery energy in milliwatt-hours
- V = battery voltage in volts
- mAh = result in milliamp-hours
Worked examples
Example 1: 5000 mWh battery at 3.7V
mAh = 5000 ÷ 3.7 = 1351.35 mAh
Example 2: 20000 mWh power bank at 5V output
mAh = 20000 ÷ 5 = 4000 mAh
Example 3: 60000 mWh laptop battery at 11.1V
mAh = 60000 ÷ 11.1 = 5405.41 mAh
Quick reference table
| Energy (mWh) | Voltage (V) | Capacity (mAh) |
|---|---|---|
| 5000 | 3.7 | 1351.35 |
| 10000 | 3.85 | 2597.40 |
| 20000 | 5.0 | 4000.00 |
| 60000 | 11.1 | 5405.41 |
How to use this calculator correctly
- Enter the battery’s energy rating in mWh.
- Enter the nominal or rated voltage in volts.
- Click Calculate to get mAh instantly.
- Use the same voltage basis when comparing different batteries.
Common mistakes to avoid
- Using 0V or missing voltage (conversion cannot be done).
- Mixing up mWh and Wh without converting (1 Wh = 1000 mWh).
- Comparing mAh across batteries with different voltages.
- Confusing cell voltage with output voltage in regulated devices.
FAQ
Can I convert mWh to mAh without voltage?
No. Voltage is required because mWh and mAh represent different electrical quantities.
Is higher mAh always better?
Not necessarily. A higher mAh value only means more charge at a specific voltage. For true capacity comparison, use mWh or Wh.
What if I only have Wh instead of mWh?
Multiply Wh by 1000 to get mWh, then use this calculator.
Final takeaway
To convert battery energy to charge capacity, remember one line: mAh = mWh ÷ V. Use the calculator above for fast, accurate conversion and cleaner battery comparisons across phones, laptops, and power systems.