Enter the Wh (watt-hours) and the voltage (volts) into the Calculator. The calculator will evaluate the mAh from Wh. 

mAh from Wh Formula

mAh = Wh*1000 / V


  • mAH is the mAh from Wh (maH (milli-amp hours))
  • Wh is the Wh (watt-hours)
  • V is the voltage (volts)

To calculate mAh from Wh, multiply the watt-hours by 1000, then divide by the voltage.

How to Calculate mAh from Wh?

The following steps outline how to calculate the mAh from Wh.

  1. First, determine the Wh (watt-hours). 
  2. Next, determine the voltage (volts). 
  3. Next, gather the formula from above = mAh = Wh*1000 / V.
  4. Finally, calculate the mAh from Wh.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

Wh (watt-hours) = 675

voltage (volts) = 40