Watt to Btu per Hour Converter

1 Watt equals 3.41214 Btu per Hour. To convert Watt to Btu per Hour, multiply the value by 3.41214.

To convert Watt to Btu per Hour, multiply the value by 3.41214. For example, 10 W = 34.1214 Btu/h.

The Watt (W) is the SI unit of power, equal to one joule per second, used for electrical appliances, light bulbs, and all power ratings.

The Btu per Hour (Btu/h) is British Thermal Units per hour (Btu/h) — used to rate air conditioners, heaters, and HVAC equipment in the United States.

100 W equals 341.214 Btu/h. To convert Watt to Btu per Hour, multiply the value by 3.41214.

Common household appliances: kettle 2,000–3,000 W, microwave 600–1,200 W, washing machine 500–2,000 W, refrigerator 100–400 W, LED bulb 6–12 W, laptop 30–70 W, TV 50–200 W. Knowing wattage helps estimate electricity costs: a 1,000 W device running 1 hour uses 1 kWh.

A typical compact car engine produces around 75–100 kW (100–135 HP). A mid-range family sedan 110–150 kW (148–201 HP). Sports cars often produce 250–500 kW (335–670 HP). In comparison, a professional cyclist produces about 250–400 W sustained — roughly 400× less than a car engine.

1 kilowatt (kW) = 1,000 watts (W). Watts are used for small appliances and electronics; kilowatts for larger equipment, engines, and electricity billing. Your electricity bill is measured in kilowatt-hours (kWh): a 1,000 W (1 kW) device running for 1 hour consumes 1 kWh.

1 horsepower (HP) = 0.7457 kilowatts. So 100 HP ≈ 74.6 kW and 200 HP ≈ 149 kW. Horsepower is still used for car engines in the US and UK; Europe and most of the world uses kilowatts. A typical family car at 110 kW is about 148 HP.

A standard residential solar panel produces 300–450 W of peak power. A typical home installation of 10 panels (3.5 kW total) generates roughly 3,500–4,500 kWh per year in central Europe, or 5,000–6,000 kWh in sunnier climates. Average European household consumption is about 3,500–4,500 kWh per year.