Watts to BTU per hour
Type a value in watts to see it in BTU per hour straight away, or type in the second box to convert back.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Type the value in the watts box.
- Read the result in BTU per hour as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
BTU/h = W × 3.412141633
Multiply the value in watts by 3.412141633 to get BTU per hour.
Example
To convert 25 W to BTU per hour: 25 × 3.412141633 = 85.3035 BTU/h.
Conversion table
| Watts (W) | BTU per hour (BTU/h) |
|---|---|
| 1 | 3.41214 |
| 2 | 6.82428 |
| 3 | 10.2364 |
| 5 | 17.0607 |
| 10 | 34.1214 |
| 20 | 68.2428 |
| 25 | 85.3035 |
| 50 | 170.607 |
| 100 | 341.214 |
| 250 | 853.035 |
| 500 | 1,706.07 |
| 1,000 | 3,412.14 |
About the units
- Watt
- The SI unit of power, equal to one joule per second.
- BTU per hour
- One BTU per hour is 1055.05585262 joules (International Table BTU) per 3600 seconds, about 0.293071 watts, the rating used for air conditioners.
Limits and caveats
- Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
- Both unit factors are exact by their official definitions.
Questions about this tool
How many BTU per hour are in one watt?
1 W = 3.41214 BTU/h exactly.
How do I convert watts to BTU per hour?
Use BTU/h = W × 3.412141633. For example, 25 W = 85.3035 BTU/h.
How many watts are in one BTU per hour?
1 BTU/h = 0.293071 W.
What is the difference between mechanical and metric horsepower?
Mechanical horsepower is about 745.7 watts and is used in the US, while metric horsepower (PS) is 735.5 watts and is used in Europe and Japan. The same engine therefore shows a PS figure about 1.4% higher.
How many kilowatts is one ton of refrigeration?
One ton of refrigeration is 12000 BTU per hour, about 3.517 kW of cooling capacity. That is cooling output, not electricity use; the unit draws less power depending on its efficiency.