Watt-hour [Wh] to Milliwatt-hour [mWh] Converter

Quick Reference

1 Watt-hour (Wh) = 1000 Milliwatt-hour (mWh)

1 Milliwatt-hour (mWh) = 0.001 Watt-hour (Wh)

How to Convert Watt-hour to Milliwatt-hour

1 Wh = 1000 mWh
1 mWh = 0.001 Wh

To convert Watt-hour to Milliwatt-hour, multiply the value by 1000. To convert Milliwatt-hour back to Watt-hour, divide by 1000.

Example: convert 10 Wh to mWh:
10 Wh = 10 x 1000 = 10000 mWh

↔ Convert Milliwatt-hour to Watt-hour

Watt-hour

Definition: A watt-hour (symbol Wh) is a unit of energy equal to one watt of power sustained for one hour. It is commonly used to measure electrical energy consumption.

History/origin: The watt-hour is derived from the watt, the SI unit of power, and the hour, a unit of time. It was developed alongside the increasing use of electricity in the late 19th and early 20th centuries.

Current use: Watt-hours are commonly used to measure the energy capacity of batteries, the energy consumption of household appliances, and the amount of electricity generated or consumed by power plants and consumers.

Milliwatt-hour

Definition: A milliwatt-hour (symbol mWh) is a unit of energy equal to one-thousandth of a watt-hour. It represents a very small amount of energy.

History/origin: The milliwatt-hour is a derivative of the watt-hour, using the SI prefix 'milli-' to denote a factor of one-thousandth.

Current use: Milliwatt-hours are used in applications involving low-power electronics, such as sensors, small batteries, and medical devices.

Watt-hour to Milliwatt-hour Conversion Table

Watt-hour [Wh]	Milliwatt-hour [mWh]
1 Wh	1000 mWh
2 Wh	2000 mWh
5 Wh	5000 mWh
10 Wh	10000 mWh
20 Wh	20000 mWh
50 Wh	50000 mWh
100 Wh	100000 mWh
200 Wh	200000 mWh
500 Wh	500000 mWh
1000 Wh	1000000 mWh

Common pairs of Energy

Watt-hour

Watt-hour to Milliwatt-hour Watt-hour to Kilowatt-hour Watt-hour to Megawatt-hour Watt-hour to Gigawatt-hour Watt-hour to Joule

Milliwatt-hour

Milliwatt-hour to Watt-hour Milliwatt-hour to Kilowatt-hour Milliwatt-hour to Megawatt-hour Milliwatt-hour to Gigawatt-hour Milliwatt-hour to Joule

Kilowatt-hour

Kilowatt-hour to Watt-hour Kilowatt-hour to Milliwatt-hour Kilowatt-hour to Megawatt-hour Kilowatt-hour to Gigawatt-hour Kilowatt-hour to Joule

Megawatt-hour

Megawatt-hour to Watt-hour Megawatt-hour to Milliwatt-hour Megawatt-hour to Kilowatt-hour Megawatt-hour to Gigawatt-hour Megawatt-hour to Joule

Gigawatt-hour

Gigawatt-hour to Watt-hour Gigawatt-hour to Milliwatt-hour Gigawatt-hour to Kilowatt-hour Gigawatt-hour to Megawatt-hour Gigawatt-hour to Joule

Joule

Joule to Watt-hour Joule to Milliwatt-hour Joule to Kilowatt-hour Joule to Megawatt-hour Joule to Gigawatt-hour

Kilojoule

Kilojoule to Watt-hour Kilojoule to Milliwatt-hour Kilojoule to Kilowatt-hour Kilojoule to Megawatt-hour Kilojoule to Gigawatt-hour

Watt-hour [Wh] to Milliwatt-hour [mWh] Converter

To convert Watt-hour to Milliwatt-hour, enter your value in the Wh field above and the result in mWh will appear instantly. You can also use the conversion factor shown in the table on this page to calculate manually. The formula is always the same: multiply your Wh value by the fixed conversion ratio to get the equivalent in mWh.

Our Watt-hour to Milliwatt-hour converter uses standardized conversion factors defined by international scientific and metrological organizations. All calculations are performed with full floating-point precision. You can also choose how many decimal places to display in the result, so you get exactly the level of detail you need.

Yes, absolutely. Simply swap the source and destination units in the converter — select mWh as your input unit and Wh as your output unit. The same precision and standardized conversion factor applies in both directions.

Converting between Watt-hour and Milliwatt-hour comes up regularly in engineering, scientific research, construction, and everyday tasks that involve measurements from different unit systems. Our converter eliminates the risk of manual calculation errors and saves time whenever you need to switch between these two units.

Yes, the Watt-hour to Milliwatt-hour converter is completely free. No account or registration is required, and there are no usage limits. It works on any device — smartphones, tablets, and desktop computers — directly in your browser.

Watt-hour and Milliwatt-hour are both units used to measure the same physical quantity, but they belong to different measurement systems or represent different scales. The mathematical relationship between them is fixed and constant, which is what makes accurate conversion possible. Scroll up to see the exact conversion factor, formula, and a reference table for common values.

Watt-hour [Wh] to Milliwatt-hour [mWh] Converter

Quick Reference

1 Watt-hour (Wh) = 1000 Milliwatt-hour (mWh)

1 Milliwatt-hour (mWh) = 0.001 Watt-hour (Wh)

How to Convert Watt-hour to Milliwatt-hour

1 Wh = 1000 mWh
1 mWh = 0.001 Wh

To convert Watt-hour to Milliwatt-hour, multiply the value by 1000. To convert Milliwatt-hour back to Watt-hour, divide by 1000.

Example: convert 10 Wh to mWh:
10 Wh = 10 x 1000 = 10000 mWh

↔ Convert Milliwatt-hour to Watt-hour

Watt-hour

Definition: A watt-hour (symbol Wh) is a unit of energy equal to one watt of power sustained for one hour. It is commonly used to measure electrical energy consumption.

Milliwatt-hour

Definition: A milliwatt-hour (symbol mWh) is a unit of energy equal to one-thousandth of a watt-hour. It represents a very small amount of energy.

History/origin: The milliwatt-hour is a derivative of the watt-hour, using the SI prefix 'milli-' to denote a factor of one-thousandth.

Current use: Milliwatt-hours are used in applications involving low-power electronics, such as sensors, small batteries, and medical devices.

Watt-hour to Milliwatt-hour Conversion Table

Watt-hour [Wh]	Milliwatt-hour [mWh]
1 Wh	1000 mWh
2 Wh	2000 mWh
5 Wh	5000 mWh
10 Wh	10000 mWh
20 Wh	20000 mWh
50 Wh	50000 mWh
100 Wh	100000 mWh
200 Wh	200000 mWh
500 Wh	500000 mWh
1000 Wh	1000000 mWh

Common pairs of Energy

Watt-hour

Watt-hour to Milliwatt-hour Watt-hour to Kilowatt-hour Watt-hour to Megawatt-hour Watt-hour to Gigawatt-hour Watt-hour to Joule

Milliwatt-hour

Milliwatt-hour to Watt-hour Milliwatt-hour to Kilowatt-hour Milliwatt-hour to Megawatt-hour Milliwatt-hour to Gigawatt-hour Milliwatt-hour to Joule

Kilowatt-hour

Kilowatt-hour to Watt-hour Kilowatt-hour to Milliwatt-hour Kilowatt-hour to Megawatt-hour Kilowatt-hour to Gigawatt-hour Kilowatt-hour to Joule

Megawatt-hour

Megawatt-hour to Watt-hour Megawatt-hour to Milliwatt-hour Megawatt-hour to Kilowatt-hour Megawatt-hour to Gigawatt-hour Megawatt-hour to Joule

Gigawatt-hour

Gigawatt-hour to Watt-hour Gigawatt-hour to Milliwatt-hour Gigawatt-hour to Kilowatt-hour Gigawatt-hour to Megawatt-hour Gigawatt-hour to Joule

Joule

Joule to Watt-hour Joule to Milliwatt-hour Joule to Kilowatt-hour Joule to Megawatt-hour Joule to Gigawatt-hour

Kilojoule

Kilojoule to Watt-hour Kilojoule to Milliwatt-hour Kilojoule to Kilowatt-hour Kilojoule to Megawatt-hour Kilojoule to Gigawatt-hour