Watts to Milliwatts Converter
Convert Watts (W) to Milliwatts (mW) instantly, or use the conversion table below to look up common values.
Watts to Milliwatts conversion table
| Watts (W) | Milliwatts (mW) |
|---|---|
| 1 | 1,000 |
| 2 | 2,000 |
| 3 | 3,000 |
| 4 | 4,000 |
| 5 | 5,000 |
| 10 | 10,000 |
| 25 | 25,000 |
| 50 | 50,000 |
| 100 | 100,000 |
How to convert Watts to Milliwatts
1 W equals 1,000 mW. Use the converter above for any value, or read the table for common conversions.
mW = W × 1000 · W = mW × 0.001Multiply a watts figure by 1,000 to get milliwatts, or divide it by 0.001 to go the other way.
Worked examples
- 1 W= 1,000 mW
- 5 W= 5,000 mW
- 10 W= 10,000 mW
- 100 W= 100,000 mW
- 500 W= 500,000 mW
What these units are
Watts (W). The watt is the SI unit of power: one joule per second. It is used for light bulbs, small appliances and solar panel ratings; an LED bulb is typically 5 to 15 watts.
Milliwatts (mW). A milliwatt is one thousandth of a watt. It is used for small electronics, radio transmission power and laser pointers; an indicator LED draws a few milliwatts.
Metric power conversions are exact. Check whether a horsepower figure is mechanical or metric before comparing two engines.
Converting Watts to Milliwatts in practice
Working in watts
The watt is the SI unit of power: one joule of energy transferred each second. Its symbol is W, and it is the base from which every larger power unit is built.
Watt ratings appear on light bulbs, televisions, kettles, solar panels, inverters and small generators. Physics and engineering use the watt for every rate of energy transfer, from a laser to a motor.
Because power is a rate and energy is an amount, a watt multiplied by a duration gives energy in joules or watt-hours. Metric steps above the watt are exact powers of one thousand.
A frequent error treats the watt as a quantity of energy, so an appliance rating is read as consumption. Power needs a time period before it becomes an amount of energy.
Watts suit appliance and electronics figures, kilowatts suit generators, inverters and solar arrays, and megawatts suit grid capacity. Milliwatts cover indicator lights and small sensors. Reading a generator rating in watts rather than kilowatts multiplies the number by a thousand and misstates the scale.
Checking a watts to milliwatts conversion
Within the metric units a power conversion is a power of a thousand: watts to kilowatts, kilowatts to megawatts, and back. Those pairs are decimal shifts and a reader can do them without a converter.
Anything involving horsepower is a multiplication by a definition rather than a shift, and there are two definitions. Mechanical horsepower is exactly 745.7 watts and metric horsepower exactly 735.49875 watts, so the same engine carries a larger figure in mechanical horsepower than in metric.
When checking a power conversion, convert to watts first, because every unit in this dimension is defined against the watt and the intermediate value makes the comparison obvious. The trap is comparing a horsepower figure with a kilowatt figure without establishing which horsepower was quoted.
Tanzania reference points
Real quantities, converted into the units on this page.
Tanzania's installed electricity generation capacity
2,881.332 MW = 2,881,332,000 W = 2,881,332,000,000 mW
EWURA reports 2,842.96 MW on the main grid and 38.372 MW off-grid, with TANESCO holding 92.31% of it. Installed capacity is what the country could generate at once, not what it generates on an average day.
Source: EWURA Fact Sheet — electricity sub-sector (installed capacity) · verified 2026-09-14
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