Wh to mAh calculation - Online Electrical Calculators

Watt-hours (wh) to milliamp-hours (mAh) Calculator.

Enter the Energy (E) in Watt-hours (wh) and Voltage in volts (V) and press the Calculator button to get the Battery Capacity (Q) in milliamp-hours (mAh):


Wh To mAh Calculator

Note, For higher values like 5×103, 10×10-6, 1.6 x1012, enter the value like this for scientific notation as 5e3, 10e-6, 1.6e12, etc.

Conversion Using the Power Formula :

DC Line wh to mAh Calculation:

The Battery Capacity (Q) in milliamp-hours (mAh) is equal to 1000 times the energy (E) in watt-hours (Wh) divided by the voltage in volts (V):

For example, Let’s find the mAh of 150 Wh for a 12V battery.
QmAh = (E wh x 1000) / Vv
mAh = (150 x 1000) / 12
mAh = 12500


    • E = Energy in watt-hours (wh)
    • Q = Battery Capacity in milliamp-hours (mAh)
    • V =Voltage in volts
wh to mah calculator and conversion
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How to use This Calculator?

To use the above “Wh to mAh Conversion Calculator” follow the below steps:

01. Enter watts-hours: Input the Energy in Watts-hours value in the specified input box. You can enter the value in watts-hours or Kilowatt-hours 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.

how to use calculator wh to mah

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 mAh” output field.

wh to mAh Conversion table:

Watt Hours to Milliamp Hours Conversions Table.
Watt Hours (Wh) Voltage (V) Milliamp Hours (mAh)
1Wh 12V 83.33 mAh
5Wh 12V 416.66 mAh
10Wh 12V 833.33 mAh
15Wh 12V 1250 mAh
20Wh 12V 1666.66 mAh
25Wh 12V 2083.33 mAh
30Wh 12V 2500 mAh
35Wh 12V 2916.66 mAh
40Wh 12V 3333.33 mAh
45Wh 12V 3750 mAh
50Wh 12V 4166.66 mAh
55Wh 12V 4583.33 mAh
60Wh 12V 5000 mAh
65Wh 12V 5416.66 mAh
70Wh 12V 5833.33 mAh
75Wh 12V 6250 mAh
80Wh 12V 6666.66 mAh
85Wh 12V 7083.33 mAh
90Wh 12V 7500 mAh
100Wh 12V 8333.33 mAh
using 12v battery as power supply

Frequently asked questions

What is watt-hour in battery?

A measure of the capacity of the battery is in Watt-hours (Wh). Wh is calculated by multiplying the number of Amps with the battery voltage.

What are Watt Hours (Wh)?

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.

Why Convert Watt Hours to Milliampere Hours?

A watt hours (Wh) and milliampere-hours (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.

What is Watt-hours?

Watt-hours (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.

What is a 100Ah battery?

The Ampere-Hour 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).

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