Battery Unit Conversion Tools

Convert between mAh, Ah, Wh, V, W, A with full explanations and examples

mAh → Wh Wh → mAh Ah → Wh Wh → Ah W → A A → W

mAh to Wh

Convert milliamp-hours (mAh) and voltage (V) into watt-hours (Wh) to estimate energy capacity.

Enter mAh (milliamp hours): Enter Voltage (V):

Formula: Wh = (mAh × V) / 1000

Example: 5000mAh at 3.7V = 18.5Wh

Wh to mAh

Convert watt-hours (Wh) to milliamp-hours (mAh) to estimate capacity at a specific voltage.

Enter Wh (watt hours): Enter Voltage (V):

Formula: mAh = (Wh × 1000) / V

Example: 18.5Wh at 3.7V = 5000mAh

Ah to Wh

Convert amp-hours (Ah) and voltage (V) into watt-hours (Wh) for larger battery systems.

Enter Ah (amp hours): Enter Voltage (V):

Formula: Wh = Ah × V

Example: 2Ah at 12V = 24Wh

Wh to Ah

Convert watt-hours (Wh) to amp-hours (Ah) to check battery discharge capacity.

Enter Wh (watt hours): Enter Voltage (V):

Formula: Ah = Wh / V

Example: 60Wh at 12V = 5Ah

W to A

Convert watts (W) and voltage (V) into current (A) for load analysis.

Enter Power (W): Enter Voltage (V):

Formula: A = W / V

Example: 120W at 12V = 10A

A to W

Convert current (A) and voltage (V) into power (W) to estimate energy use.

Enter Current (A): Enter Voltage (V):

Formula: W = A × V

Example: 2A at 5V = 10W

Battery Unit Basics

What is mAh (milliamp-hour)?

mAh represents how much charge a battery can deliver over time. It’s commonly used to describe the capacity of smaller batteries such as those in smartphones or portable devices. Higher mAh means longer battery runtime, assuming the same voltage.

What is Wh (watt-hour)?

Wh measures the total amount of energy stored in a battery. It accounts for both capacity and voltage, making it a more accurate way to compare batteries of different voltages. 1Wh means a device can consume 1 watt of power for one hour.

What is Ah (amp-hour)?

Ah is typically used for larger batteries like those in power stations or EVs. It tells you how many amps a battery can deliver continuously over one hour. Multiply Ah by voltage to get Wh.

What is V (voltage)?

Voltage is the potential difference that drives electrical current. Different batteries and devices operate at different voltages—common values include 3.7V (lithium-ion), 12V (car battery), or 5V (USB power).

What is A (ampere)?

Ampere (or amp) measures the flow of electrical current. A higher current means more electricity is flowing through a circuit per second. Current depends on both voltage and resistance/load.

What is W (watt)?

Watt is a unit of power. It represents the rate of energy use or production. It is calculated as W = V × A. For example, a 100W light bulb uses 100 watts of energy per second while on.