Battery capacity converter
Enter the battery capacity, its unit and the corresponding nominal voltage to convert between mAh, Ah and Wh. View 3 values under the same voltage conditions, then copy them together or save them as TXT. The calculation does not include discharge conditions, degradation, conversion losses or the number of possible charges.
What you can do
Compare mAh, Ah and Wh together
Specify the capacity value, its unit and the nominal voltage to view the values expressed in 3 units together.
Check the voltage used with the results
Also displays the nominal voltage used for the conversion to Wh. This helps you notice the conditions when comparing batteries with different voltages.
How to use
Enter the capacity and unit
Enter the capacity from specifications or another source, and choose mAh, Ah or Wh as the unit.
Enter the nominal voltage on the same basis
Specify the nominal voltage of the battery or pack corresponding to the capacity you entered.
Review the converted results
Press Convert to check the 3 values and voltage conditions, then copy or save the results if needed.
Useful when
Compare capacity labels in different units
Check the nominal capacities of products labeled in mAh and products labeled in Wh using the same unit.
Calculate Wh from specification values
Use this when you want to check energy in Wh for a battery whose capacity and nominal voltage are known.
Capacity units and nominal voltage
Difference between mAh / Ah and Wh
mAh and Ah represent electric charge, while Wh represents energy. 1000mAh is 1Ah, but converting to Wh requires voltage.
Use voltage on the same basis as capacity
Calculated as Wh = Ah × V. If the capacity is a cell-side value, use the cell's nominal voltage. Do not mix in values on another basis, such as USB output voltage.
Distinguish it from the amount actually usable
This calculation is a unit conversion under the conditions you enter. It does not include discharge conditions, degradation, losses from voltage conversion or the number of possible charges.
Frequently asked questions
Does the same mAh mean the same energy?
Wh changes when the voltage differs. Do not compare using mAh alone; check it together with the corresponding nominal voltage.
Where can I check the voltage?
Check the nominal voltage on the battery or device label, or in the manufacturer's specifications. Also check which voltage the entered capacity is based on.
Can I find out how many times it can charge a smartphone?
This screen converts units between mAh, Ah and Wh. It does not account for charging efficiency or actual usage conditions, so it does not calculate the number of possible charges.
Input and results
- Input
- Capacity and its unit, and the corresponding nominal voltage.
- Results
- mAh, Ah and Wh under the same voltage conditions.
- Save
- Copy all 3 items together or save as TXT. Changing the input clears the previous results.