To calculate how many hours a certain **mAh** lasts, you need to know either the **current**, or the **voltage** and **watts**:

First, fill in this box with your **mAh**:

mAh

Then fill in the **current** and click on **Calculate**, OR fill in the **voltage** and **watts** and click on **Calculate**.

Current: Amps

Hours

OR

Voltage: Volts

Watts: Watts

Hours

The formula is (mAh)/(Amps*1000) = (hours). For example, if you have a 3000 mAh battery that runs at 0.2 Amps (0.2Amps = 200mA), then the time that the battery will last for is (3000)/(0.2*1000) = (3000)/(200)= 15 Hours.

If instead of the current you have voltage and watts, then the formula is (mAh*Volts)/(Watts*1000) = (hours). For example, if you have a 3000 mAh battery that runs at 5 Volts and 15 Watts, then the time that the battery will last for is (3000*5)/(15*1000) = 1 Hours.

Got feedback? email: suggestionsfeed@gmail.com