Multiply BTU/h by 0.293071
1 BTU equals 1055.06 joules (the precise IT-table value). 1 BTU per hour equals 1055.06 J ÷ 3600 s = 0.293071 W. ConvertBuddy assumes BTU/h when converting BTU to watts, since that is the rated specification on HVAC and combustion equipment. To convert raw BTU (energy, not rate) to joules instead, multiply by 1055.06. Energy and power are different physical quantities — confusing them gives nonsense results for sizing decisions.
BTU and watts both relate to energy, but in different forms. A BTU (British Thermal Unit) is energy — the heat to raise one pound of water by one degree Fahrenheit. A watt is power — energy per unit time, specifically one joule per second.
The conversion most people search for is actually BTU per hour (BTU/h) to watts, which compares heating or cooling rates. Air conditioners, furnaces, gas grills, and water heaters all rate output in BTU/h in the US and in watts or kilowatts in metric markets.
1 BTU/h equals 0.293 watts. A 10,000 BTU/h window AC equals roughly 2.93 kW of cooling capacity.
US window and portable AC units rate cooling in BTU/h. European mini-splits rate in watts or kW. Convert to compare the same model spec across regions or pick the right unit for a room calculated by either local sizing guide.
Gas heaters list output in BTU/h, electric heaters in watts. Convert to evaluate true output capacity, not just sticker spec, when deciding which to install for a given space.
Patio heaters in the US list 40,000-50,000 BTU/h. EU-sold equivalents list 12-15 kW. Convert to confirm the heater handles your patio area before buying internationally.
Inground pool heaters rate 200,000-400,000 BTU/h. Heat pump alternatives rate in kW. Convert to compare operating cost across heater types using a single power unit.
Server rack heat dissipation is given in watts (server PSU draw). HVAC capacity is sold in BTU/h or tons (12,000 BTU/h per ton). Convert to size the cooling solution against the heat load.
If you mean BTU/h (the typical equipment rating), multiply by 0.293. So 10,000 BTU/h = 2930 W = 2.93 kW. If you mean raw BTU energy (rare in everyday use), multiply by 1055 to get joules.
1 BTU per hour equals 0.293 watts. Conversely 1 watt equals 3.412 BTU/h. The factors come from 1 BTU = 1055.06 J spread across 3600 seconds per hour.
A 10,000 BTU/h AC delivers approximately 2930 W of cooling capacity. Its electrical input draw is typically 900-1200 W depending on efficiency (EER 8-11). Output cooling exceeds electrical input because heat pumps move heat rather than create it.
BTU is energy; BTU/h is the rate of delivering that energy, i.e. power. Confusing the two leads to wrong sizing. HVAC, gas appliances, and grills are always rated in BTU/h, even when the spec sheet just writes 'BTU'.
A rough US rule of thumb: 20 BTU/h per square foot of living space, adjusted up for sunny rooms or high ceilings, down for shaded or low-occupancy rooms. A 500 sq ft room needs ~10,000 BTU/h ≈ 2.93 kW.
Yes — '1 ton of refrigeration' equals 12,000 BTU/h. The unit comes from the historical refrigeration capacity required to freeze one short ton of water in 24 hours. Commercial HVAC routinely uses tons; residential uses BTU/h directly.
No. BTU and watts are energy and power units, independent of source. A 50,000 BTU/h gas furnace and a 50,000 BTU/h electric heater both deliver the same heat output rate (14.65 kW). Efficiency at producing that output differs by fuel and equipment.
Inertia and consumer familiarity. The US HVAC and gas appliance industries standardized on BTU/h long before metric adoption was discussed. Migration to watts is slow because installers, sales literature, and consumer expectation are all anchored in BTU.