How to convert watts to BTU per hour
One watt equals 3.412142 BTU per hour. To convert, multiply the number of watts by 3.412142:
Mental-math shortcut: Multiply watts by 3.41: a 1,500 W space heater puts out about 5,118 BTU/h.
Example
Convert 1,500 watts to BTU per hour: 1,500 W × 3.412142 = 5,118.21 BTU/h.
Watts to BTU per Hour conversion chart
| Watts (W) | BTU per Hour (BTU/h) |
|---|---|
| 100 | 341.21 |
| 250 | 853.04 |
| 500 | 1,706.07 |
| 750 | 2,559.11 |
| 1,000 | 3,412.14 |
| 1,500 | 5,118.21 |
| 2,000 | 6,824.28 |
| 3,000 | 10,236.42 |
| 3,517 | 12,000.5 |
| 5,000 | 17,060.71 |
| 10,000 | 34,121.42 |
What is a watt?
The watt (W) is the SI unit of power — one joule of energy per second. Light bulbs, appliances, chargers and solar panels are rated in watts. A modern LED bulb uses about 9 W, a microwave about 1,000 W, and running a 1,000 W device for one hour uses 1 kilowatt-hour (kWh).
What is a BTU per hour?
BTU per hour (BTU/h, often just "BTU") measures heating and cooling power in the US. One BTU is the energy needed to warm one pound of water by 1 °F. Air conditioners and furnaces are sized in BTU/h — a 12,000 BTU/h air conditioner (one "ton" of cooling) delivers about 3.5 kW.
Converting the other way? Use the BTU per Hour to Watts converter.
Frequently asked questions
How many BTU per hour is one watt?
One watt is 3.412142 BTU per hour.
How do I convert watts to BTU per hour?
Multiply the value in watts by 3.412142. For example, 1,500 W × 3.412142 = 5,118.21 BTU/h.
What is 1,000 W in BTU per hour?
1,000 W is 3,412.14 BTU per hour.
How do I convert BTU per hour to watts?
Multiply BTU per hour by 0.293071 (or divide by 3.412142). You can also use our BTU per Hour to Watts converter.
Conversions use the internationally agreed definitions of each unit (for example, 1 inch = 2.54 cm exactly) and are rounded for display. Volume converters use US customary units unless stated otherwise.
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