Loading the page...
Preparing tools and content for you. This usually takes a second.
Preparing tools and content for you. This usually takes a second.
Fetching calculator categories and tools for this section.
Convert watts (W) to BTU per hour (BTU/h) and BTU/h to watts instantly. Matches how air conditioners, heat pumps, and heaters quote thermal power in North America alongside electrical power in watts.
Last updated: April 8, 2026
Need a custom power calculator? Get a Quote
Watts
1,000 W
BTU/h
3,412.14163313 BTU/h
Kilowatts
1 kW
Quick facts
Formula
BTU/h = W × 3.412141633
Formula
W = BTU/h × 0.29307107
Also shown
kW = W ÷ 1,000
1,500 W (typical space heater class):
Input
1,500 W
Result
5,118.21 BTU/h
A watt is one joule per second. The IT British thermal unit is defined as 1,055.05585262 joules. One BTU per hour is therefore that energy divided by 3,600 seconds, which gives a fixed number of watts per BTU/h. This page uses those definitions so W and BTU/h stay consistent with engineering references.
BTU/h = W × (3,600 ÷ 1,055.05585262)W = BTU/h × (1,055.05585262 ÷ 3,600)kW = W ÷ 1,000COP, EER, and real-world losses are not included—this is pure unit conversion.
| Watts | BTU/h (approx.) |
|---|---|
| 100 | 341.21 |
| 500 | 1706.07 |
| 1,000 | 3412.142 |
| 1,500 | 5118.21 |
| 3,500 | 11942.50 |
Comparing shaft power? Try our horsepower to watts converter.
Get Custom Calculator for Your PlatformResult: 12,000 BTU/h ≈ 3,516.85 W
Result: 2,000 W ≈ 6,824.28 BTU/h
Share it with HVAC techs, homeowners, and students
Suggested hashtags: #WattsToBtu #HVAC #PowerConverter #Heating #Calculator