mAh to Wh calculation  Online Electrical Calculators
milliamphour (mAh) to watthours (wh) Calculator.
Enter the Battery Capacity (Q) in milliamphour (mAh) and Voltage in volts (V) and press the Calculator button to get the Energy (E) in watthour (wh):
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Note, For higher values like 5×10^{3}, 10×10^{6}, 1.6 x10^{12}, enter the value like this for scientific notation as 5e3, 10e6, 1.6e12, etc.
Conversion Using the Power Formula :
DC Line mAh to wh Calculation:
The Energy (E) in watthours (Wh) is equal to the electric charge (Q) in milliamphours (mAh) times the voltage (V) in volts (V) divided by 1000:
For example, let’s convert the charge used by an average C battery with a charge of 10,000 mAh at 3V to Wh.
E_{(wh)} = 10000 x 3 ÷ 1000
E_{(wh)} = 30 wh
Where:

 E = Energy in watthours (wh)
 Q = Battery Capacity in milliamphours (mAh)
 V = Voltage in volts
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How to use This Calculator?
To use the above “milliamphour (mAh) to Watthours (wh) conversion Calculator” follow the below steps:
01. Enter milliamphours: Input the Battery Capacity in milliamphours value in the specific input box. You can enter the value in mAh by choosing the appropriate option from the dropdown.
02. Enter Supply Voltage: Input the supply voltage or motor voltage value in the specified input box. You can enter the value in Volts or Kilovolts by choosing the appropriate option from the dropdown.
03. Reset: If you want to “reset” the calculator to perform another conversion, you can click the “Reset” button, and all input fields will be cleared.
04. Calculate: Click the “Calculate” button to obtain the results. The calculated results will be displayed in the “Results:” section.
05. Swap: If you want to “Swap” the calculated to Exchange conversion, you can click the “Swap” button, and Calculate will be Exchange.
06. Result: The calculated “result” will be displayed in the respective “Result In watthours (wh)” output field.
mAh to Wh Conversion table:
Milliamp Hours (mAh)  Voltage (V)  Watt Hours (Wh) 

1mAh  12V  0.012Wh 
1000mAh  12V  12Wh 
1200mAh  12V  14.4Wh 
2000mAh  12V  24Wh 
2500mAh  12V  30Wh 
3000mAh  12V  36Wh 
4000mAh  12V  48Wh 
4500mAh  12V  54Wh 
5000mAh  12V  60Wh 
7500mAh  12V  90Wh 
8800mAh  12V  105.6Wh 
10000mAh  12V  120Wh 
15000mAh  12V  180Wh 
20000mAh  12V  240Wh 
25000mAh  12V  300Wh 
30000mAh  12V  360Wh 
50000mAh  12V  600Wh 
55000  12V  660Wh 
60000mAh  12V  720Wh 
70000mAh  12V  840Wh 
using 12v battery as power supply 
Frequently asked questions
A measure of the capacity of the battery is in Watthours (Wh). Wh is calculated by multiplying the number of Amps with the battery voltage.
A Watt Hours (Wh) represents a unit of electrical energy that describes the total amount of Real power consumed over a specific duration. Essentially, it’s a measure of how much energy a device uses when it runs for an hour.
A watt hours (Wh) and milliamperehours (mAh) can give a comprehensive view of a battery’s capacity. Converting Wh to mAh or vice versa is often necessary for comparison, especially when purchasing or replacing batteries.
Watthours (Wh) is a unit of energy measurement. It represents the amount of energy consumed or produced over a period of 2 hours at a constant rate of one watt. This unit is commonly used to measure the energy consumption of electrical devices or systems. It is calculated by multiplying the power (p) in watts (w) by the time (t) in hours during which the power is consumed or produced.
The AmpereHour Capacity is the amount of electricity that a battery will deliver during 20 hours before the voltage falls to 10.50V. For example, a 10Ah battery will deliver a current of 5A for 20 hours. Recommended Charge Rate (Amps).