Enter a value in any field to convert between all units
Visual representation of power magnitude
Note: The visualization shows relative magnitude on a logarithmic scale.
Compare different power magnitudes across common applications
| Power Range | Example Applications | Typical Units |
|---|---|---|
| 1 pW - 1 nW | Ultra-low power sensors, quantum computing components | pW |
| 1 nW - 1 μW | RFID tags, energy harvesting devices, low-power sensors | nW |
| 1 μW - 1 mW | Bluetooth Low Energy devices, hearing aids, wearable sensors | μW |
| 1 mW - 1 W | LEDs, small electronic circuits, IoT devices | mW |
| 1 W - 1 kW | Smartphones, laptops, small appliances | W |
| 1 kW - 1 MW | Household appliances, electric vehicles, small buildings | kW |
| 1 MW - 1 GW | Small power plants, large industrial facilities, city districts | MW |
| 1 GW - 1 TW | Large power plants, regional power grids | GW |
| 1 TW - 1 PW | National power grids, global energy consumption | TW |
Understanding power units in various fields and industries
In electronics, power is typically measured in microwatts (μW) to watts (W). For example:
Understanding power consumption is essential for battery life calculations, thermal management, and energy efficiency design.
Industrial settings often deal with much larger power levels, measured in kilowatts (kW) to megawatts (MW):
Power calculations are critical for sizing equipment, designing electrical distribution systems, and energy management.
Power generation facilities produce enormous amounts of power:
Power units help engineers design and manage generation facilities to meet demand while maintaining grid stability.
Household power usage is typically measured in watts (W) to kilowatts (kW):
Understanding power consumption helps homeowners manage energy costs and size renewable energy systems appropriately.
Power is the rate at which energy is transferred, used, or transformed. The SI unit of power is the watt (W), which equals one joule per second (J/s).
Power units follow the standard SI prefixes:
Power units cover an enormous range, from the microwatts a sleeping sensor consumes to the gigawatts a power station produces, and the prefix usually tells you the domain at a glance.
The conversions that cause trouble are not between prefixes but between different quantities that look similar:
| Prefix | Symbol | Factor |
|---|---|---|
| pico | p | 10−12 |
| nano | n | 10−9 |
| micro | µ | 10−6 |
| milli | m | 10−3 |
| kilo | k | 103 |
| mega | M | 106 |
| giga | G | 109 |
Two conventions cause real errors. Case matters: m is milli and M is mega, a factor of a billion apart, so writing mW when MW is meant is not a typo anyone can shrug off. And µ is frequently written as u because it is easier to type — 10uF and 10µF mean the same thing, and the substitution is universal enough in datasheets and schematics to be treated as standard.
Engineering notation — exponents restricted to multiples of three — exists precisely so that every value maps onto a prefix. It is why components are specified as 4.7 kΩ rather than 0.0047 MΩ, and why keeping values in that form makes mental arithmetic and cross-checking far easier.
Kilowatts measure real power that does work; kilovolt-amperes measure apparent power, the product of RMS voltage and current. They are equal only when the power factor is 1.
A kilowatt is a rate of energy use; a kilowatt-hour is an amount of energy, equal to a kilowatt sustained for one hour. Bills are charged per kWh.
m is milli, meaning one thousandth, and M is mega, meaning one million. They differ by a factor of a billion, so case must be written carefully.
Because µ is awkward to type on many keyboards and did not survive older character encodings. Writing 10uF for 10µF is standard practice in datasheets and schematics.
Scientific notation restricted to exponents that are multiples of three, so that every value corresponds to an SI prefix. It is why components are quoted as 4.7 kΩ rather than 0.0047 MΩ.