Updated · Built and checked by the PlinzoTools team, formulas tested against published sources
Convert BTU/hr to Watts instantly with an exact, accurate formula -- no sign-up, no ads blocking the result.
BTU/hr and Watts both measure power, just in different systems; this tool applies the exact 0.29307107 factor between them the instant you type. Power unit conversions matter for electrical appliances, HVAC equipment sizing, and generators -- watts and kilowatts are the standard electrical power units on appliance labels and utility bills, while BTU/hr is the traditional US unit for heating and cooling equipment capacity. One BTU per hour equals about 0.293071 watts, still common in HVAC equipment ratings. The watt is the SI unit of power: one joule of energy per second.
Enter your value and confirm the "From Unit" dropdown is set to BTU/hr -- the result grid updates instantly, showing your value converted into every unit in this power category at once (not just Watts), so you can see multiple equivalent measurements without switching tools. There's no button to press and nothing is sent to a server, so it works the same on a phone with no signal as it does on a desktop.
Watts = BTU/hr × 0.29307107
A watt is the SI unit of power (one joule of energy per second); BTU/hr (British Thermal Units per hour) is a US customary heat-power unit -- the two describe the same physical quantity (a rate of energy transfer), related by the precise constant 1 watt = 3.412141633 BTU/hr, derived from the exact joule-to-BTU energy relationship.
| BTU/hr | Watts |
|---|---|
| 1 | 0.29307107 |
| 5 | 1.46535535 |
| 10 | 2.9307107 |
| 50 | 14.65355351 |
| 100 | 29.30710702 |
Sizing HVAC equipment (air conditioners, heaters) where US spec sheets use BTU/hr but electrical specs use watts. Comparing an appliance's electrical power rating against its heating/cooling output rating. Converting a generator or power supply's wattage rating for an international spec sheet. For related conversions, see Watts to BTU/hr Converter and Electricity Cost Calculator.
This calculator carries full precision internally and only rounds the final displayed result for readability -- if you need more or fewer decimal places than shown, the underlying value is still exact to the limits of floating-point arithmetic.
Multiply the BTU/hr value by 0.29307107 to get Watts. This calculator does that automatically as you type, so you don't need to do the multiplication by hand.
Yes -- 1 BTU/hr equals 0.29307107 Watts by definition, so the result is mathematically exact rather than a rounded estimate (the displayed value may be rounded for readability, but the underlying calculation isn't).
Yes -- change the "From Unit" dropdown above the input to switch direction. The same conversion engine handles every unit in this category, not just BTU/hr and Watts.
No -- power (watts, BTU/hr) is a rate of energy transfer, while energy (watt-hours, kWh, BTUs) is a total amount over time. Watts and BTU/hr are both power units, so they convert directly; converting to a total energy figure would additionally require knowing how many hours something ran.
Watts is one of the standard units for measuring power -- see the Practical Uses section above for the specific contexts where it's most commonly encountered.
100 btu/hr equals 29.307107 watts, using the same 0.29307107 factor as the rest of this page.
The exact btu/hr-to-watts factor is 0.2930711 -- multiply to convert forward, or multiply by 3.412142 to convert watts back to btu/hr. For example, 12.5 btu/hr × 0.2930711 = 3.663388 watts, and 25 btu/hr × 0.2930711 = 7.326777 watts.
One BTU per hour equals about 0.293071 watts, still common in HVAC equipment ratings. The watt is the SI unit of power: one joule of energy per second.
| BTU/hr | Watts |
|---|---|
| 1 | 0.2930711 |
| 2 | 0.5861421 |
| 3 | 0.8792132 |
| 5 | 1.465355 |
| 10 | 2.930711 |
| 15 | 4.396066 |
| 20 | 5.861421 |
| 25 | 7.326777 |
| 50 | 14.65355 |
| 75 | 21.98033 |
| 100 | 29.30711 |
| 250 | 73.26777 |
| 500 | 146.5355 |
| 1,000 | 293.0711 |
How many watts are in 1 btu/hr?
1 btu/hr equals 0.2930711 watts.
How many btu/hr are in 1 watts?
1 watts equals 3.412142 btu/hr.
What is 7 btu/hr in watts?
7 btu/hr equals 2.051497 watts, using the same 0.2930711 factor as the rest of this chart.
Is this conversion exact or approximate?
The 0.2930711 factor comes from a fixed, exact definitional constant, so the underlying math is exact; the numbers on this page are rounded to seven significant digits for readability, and the calculator above keeps the full-precision value.
Values are rounded to seven significant digits for display; the converter above uses the full-precision factor.
Reference: NIST Weights and Measures