Watt Converter

A watt (W) is the International System of Units (SI) unit of power. It represents an energy transfer rate of one joule per second (1 W = 1 J/s). Watts are used to describe how quickly a device consumes or produces energy — for example, a 60W light bulb consumes 60 joules of energy every second.

To convert watts to kilowatts, divide the watt value by 1,000. For example, 1,500 watts equals 1.5 kilowatts (1,500 ÷ 1,000 = 1.5 kW). Kilowatts are commonly used for household appliances and electricity billing.

One mechanical horsepower (HP) equals 745.7 watts. To convert horsepower to watts, multiply the HP value by 745.7. For example, 160 HP equals 119,312 watts (160 × 745.7 = 119,312 W).

One watt equals approximately 3.41214 BTU per hour (BTU/h). To convert watts to BTU/h, multiply the watt value by 3.41214. Conversely, divide BTU/h by 3.41214 to get watts. This conversion is commonly used in heating, ventilation, and air conditioning (HVAC) systems.

Watts (W) measure power — the rate at which energy is used or produced at any given moment. Watt-hours (Wh) measure energy — the total amount of power consumed over a period of time. A 100W device running for 10 hours consumes 1,000 Wh (1 kWh) of energy. Power and energy are related but distinct quantities.

There are 1,000 milliwatts (mW) in one watt. Milliwatts are used for very small power values such as those found in radio signals, audio equipment, and low-power electronics. To convert watts to milliwatts, simply multiply by 1,000.

0.5 milliwatts equals 0.0005 watts. To convert milliwatts to watts, divide by 1,000. Milliwatt values are typical in telecommunications and wireless signal strength measurements.

Key power conversions include: 1 kW = 1,000 W, 1 MW = 1,000,000 W, 1 HP = 745.7 W, 1 W = 3.41214 BTU/h, and 1 W = 0.239006 calories per second. These conversions are frequently used in electrical engineering, mechanical engineering, and energy management.