If you work with air conditioners, heat pumps, furnaces, or HVAC sizing charts, you will often need to convert BTU/hr to kW. Use the calculator below for instant conversion, then scroll down for formulas, examples, and practical tips.
BTU/hr to kW Calculator
Enter thermal power in BTU per hour and click convert.
Formula: kW = BTU/hr × 0.00029307107
How to Convert BTU to kW
The standard conversion factor is based on the relationship between imperial and metric energy units. In HVAC and power comparisons, the most common conversion is:
- 1 BTU/hr = 0.00029307107 kW
- 1 kW = 3412.142 BTU/hr
So if you have a system rated at 24,000 BTU/hr, multiply by 0.00029307107 to get roughly 7.03 kW of thermal power.
Manual Example
Convert 12,000 BTU/hr to kW:
kW = 12,000 × 0.00029307107 = 3.5169 kW
This is why a “1-ton” air conditioning system (12,000 BTU/hr) is often shown as about 3.52 kW thermal capacity.
Common BTU/hr to kW Conversions
| BTU/hr | kW |
|---|---|
| 5,000 | 1.47 |
| 9,000 | 2.64 |
| 12,000 | 3.52 |
| 18,000 | 5.28 |
| 24,000 | 7.03 |
| 36,000 | 10.55 |
| 48,000 | 14.07 |
| 60,000 | 17.58 |
Why This Conversion Matters
Converting BTU/hr to kW is useful when you need to compare equipment specifications across regions, estimate building load, or align an HVAC design with electrical planning documents. Manufacturers in the U.S. often publish BTU/hr, while many international standards and utility engineers use kW.
Typical use cases
- Comparing U.S. AC unit ratings with metric equipment datasheets
- Checking heating/cooling capacity against design loads
- Preparing engineering reports with consistent units
- Evaluating thermal output versus electrical input power
BTU vs BTU/hr vs kW (Important Distinction)
People often say “BTU to kW,” but technically this usually means BTU per hour (BTU/hr) to kW because both are power units.
- BTU = energy quantity
- BTU/hr = rate of energy transfer (power)
- kW = power
If you have plain BTU (energy), the equivalent in kWh is:
kWh = BTU ÷ 3412.142
FAQ
Is 12,000 BTU/hr equal to 1 ton of cooling?
Yes. In HVAC, 1 refrigeration ton is defined as 12,000 BTU/hr, which is approximately 3.517 kW of cooling capacity.
Does this calculator give electrical consumption?
No. This tool converts thermal capacity (BTU/hr) to thermal power (kW). Electrical input depends on equipment efficiency (EER, SEER, COP, etc.).
Can I enter decimals?
Yes. You can enter values like 12500.5 and the calculator will return a precise kW value.
Bottom Line
This BTU to kW calculator gives fast and reliable unit conversion for HVAC and thermal applications. Enter your BTU/hr value, convert instantly, and use the result for equipment comparison, planning, and technical documentation.