# Watt (W)

## Watt definition

Watt is the unit of power (symbol: W).

The watt unit is named after James Watt, the inventor of the steam engine.

One watt is defined as the energy consumption rate of one joule per second.

1W = 1J / 1s

One watt is also defined as the current flow of one ampere with voltage of one volt.

1W = 1V × 1A

## Watt to mW, kW, MW, GW, dBm, dBW conversion calculator

Convert watt to milliwatt, kilowatt, megawatt, gigawatt, dBm, dBW.

Enter the power in one of the text boxes and press the Convert button:

 Enter milliwatts: mW Enter watts: W Enter kilowatts: kW Enter megawatts: MW Enter gigawatts: GW Enter dBm: dBm Enter dBW: dBW

## Table of unit prefixes of watt

name symbol conversion example
picowatt pW 1pW = 10-12 W P = 10 pW
nanowatt nW 1nW = 10-9 W P = 10 nW
microwatt μW 1μW = 10-6 W P = 10 μW
milliwatt mW 1mW = 10-3 W P = 10 mW
watt W - P = 10 W
kilowatt kW 1kW = 103 W P = 2 kW
megawatt MW 1MW = 106 W P = 5 MW
gigawatt GW 1GW = 109 W P = 5 GW

### How to convert watts to kilowatts

The power P in kilowatts (kW) is equal to the power P in watts (W) divided by 1000:

P(kW) = P(W) / 1000

### Example 1

Convert 1100W to kilowatts:

P(kW) = 1100W / 1000 = 1.1kW

### Example 2

Convert 1900W to kilowatts:

P(kW) = 1900W / 1000 = 1.9kW

### How to convert watts to milliwatts

The power P in milliwatts (mW) is equal to the power P in watts (W) times 1000:

P(mW) = P(W) ⋅ 1000

### Example 1

Convert 2W to milliwatts:

P(mW) = 1000 ⋅ 2W = 2000mW

### Example 2

Convert 9W to milliwatts:

P(mW) = 1000 ⋅ 9W = 9000mW

### How to convert watts to dBm

The power P in decibel-milliwatts (dBm) is equal to 10 times base 10 logarithm of the power P in milliwatts (mW) divided by 1 milliwatt:

P(dBm) = 10 ⋅ log10( P(mW) / 1mW)

#### Example 1

Convert 25 watts to dBm:

P(dBm) = 10 ⋅ log10(1000⋅20W) = 43.979400087dBm

#### Example 2

Convert 55 watts to dBm:

P(dBm) = 10 ⋅ log10(1000⋅55W) = 47.403626895dBm

### How to convert watts to amps

The current I in ampers (A) is equal to the power P in watts (W) divided by the voltage V in volts (V):

I(A) = P(W) / V(V)

#### Example 1

P = 200W, V = 50V

I = 200W / 50V = 4A

#### Example 2

P = 300W, V = 50V

I = 300W / 50V = 6A

### How to convert watts to volts

The voltage V in volts (V) is equal to the power P in watts (W) divided by the current I in ampers (A):

V(V) = P(W) / I(A)

#### Example 1

What is the voltage in volts when the power consumption is 90 watts and the current flow is 3 amps?

V = 90W / 3A = 30V

#### Example 2

What is the voltage in volts when the power consumption is 135 watts and the current flow is 3 amps?

V = 135W / 3A = 45V

### How to convert watts to ohms

R(Ω) = P(W) / I(A)2

R(Ω) = V(V)2/ P(W)

### How to convert watts to btu/hr

P(BTU/hr) = 3.412142 ⋅ P(W)

#### Example 1

Convert 7000W to BTUs per hour:

P(BTU/hr) = 3.412141633 ⋅ 7000W = 23884.991431 BTU/hr

#### Example 2

Convert 15000W to BTUs per hour:

P(BTU/hr) = 3.412141633 ⋅ 15000W = 51182.124495 BTU/hr

### How to convert watts to joules

E(J) = P(W)t(s)

#### Example 1

What is the energy consumption of an electrical circuit that has power consumption of 50 watts for time duration of 3 seconds?

E(J) = 50W × 3s = 150J

#### Example 2

What is the energy consumption of an electrical circuit that has power consumption of 80 watts for time duration of 3 seconds?

E(J) = 80W × 3s = 240J

### How to convert watts to horsepower

P(HP) = P(W) / 746

##### Example 1

Convert 16W to electrical horsepower:

P(hp) = 16W / 746 = 0.02144772118 hp

##### Example 2

Convert 26W to electrical horsepower:

P(hp) = 26W / 746 = 0.034852546917 hp

### How to convert watts to kVA

The real power P in watts (W) is equal to 1000 times the apparent power S in kilo-volt-amperes (kVA) times the power factor (PF) or cosine of the phase angle φ:

P(W) = 1000 ⋅ S(kVA)PF = 1000 ⋅ S(kVA) ⋅ cos φ

### How to convert watts to VA

The real power P in watts (W) is equal to the apparent power S in volt-amperes (VA) times the power factor (PF) or cosine of the phase angle φ:

P(W) = S(VA)PF = S(VA) ⋅ cos φ

## Power consumption of some electrical components

How many watts does a house use? How many watts does a TV use? How many watts does a refrigerator use?

Electric component Typical power consumption in watts
LCD TV 30..300 W
LCD monitor 30..45 W
PC desktop computer 300..400 W
Laptop computer 40..60 W
Refrigerator 150..300 W (when active)
Light bulb 25..100 W
Fluorescent light 15..60 W
Halogen light 30..80 W
Speaker 10..300 W
Microwave 100..1000 W
Air conditioner 1..2 kW

Kilowatt (kW) ►

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