BTU per Hour to kW Converter
Convert BTU per hour to kilowatts — 3,412 BTU/h make a kilowatt. Results update as you type; exact factors shown.
One BTU per hour is 0.0003 kilowatts — see the exact factor, not a rounded rule of thumb.
How the btu per hour to kw converter works
Power converts through the watt. Mechanical horsepower is 550 ft·lbf/s = 745.6999 W; metric horsepower (PS, used in European car specs) is 735.4988 W. Air-conditioner capacities are quoted in kW, BTU/h (1 W = 3.412 BTU/h) or tons of refrigeration (3.517 kW).
The UK is metric for most trade and science but keeps miles, pints, stone and mpg (with the imperial gallon) in daily life.
Common power conversions
| From | To | Units |
|---|---|---|
| 5,000 BTU/h | 1.4654 kW | BTU per hour to kilowatts |
| 9,000 BTU/h | 2.6376 kW | BTU per hour to kilowatts |
| 12,000 BTU/h | 3.5169 kW | BTU per hour to kilowatts |
| 18,000 BTU/h | 5.2753 kW | BTU per hour to kilowatts |
| 24,000 BTU/h | 7.0337 kW | BTU per hour to kilowatts |
| 30,000 BTU/h | 8.7921 kW | BTU per hour to kilowatts |
| 36,000 BTU/h | 10.5506 kW | BTU per hour to kilowatts |
| 42,000 BTU/h | 12.309 kW | BTU per hour to kilowatts |
| 48,000 BTU/h | 14.0674 kW | BTU per hour to kilowatts |
| 60,000 BTU/h | 17.5843 kW | BTU per hour to kilowatts |
| 80,000 BTU/h | 23.4457 kW | BTU per hour to kilowatts |
| 100,000 BTU/h | 29.3071 kW | BTU per hour to kilowatts |
Units in this converter and their exact factors
| Unit | Symbol | One unit in watts |
|---|---|---|
| watt | W | 1 watt |
| kilowatt | kW | 1,000 watt |
| megawatt | MW | 1,000,000 watt |
| horsepower (mechanical) | hp | 745.6998715823 watt |
| metric horsepower (PS) | PS | 735.49875 watt |
| BTU per hour | BTU/h | 0.29307107 watt |
| ton of refrigeration | TR | 3,516.8528421 watt |
FAQFrequently asked questions about power conversion
How many kW is 12,000 BTU/h?
3.517 kW — one ton of refrigeration.
What size room does 9,000 BTU/h suit?
Roughly a 20 m² bedroom, though insulation and orientation matter more than floor area.
Why is my quote in BTU?
Air-conditioning capacity is quoted in BTU/h across much of the trade, even in metric countries.
What is 24,000 BTU/h in kW?
7.03 kW.
Is a bigger unit better?
No. An oversized air conditioner short-cycles, dehumidifies poorly and costs more to run.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Physical Laboratory (NPL) — United Kingdom's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.