Convert kW to BTU/hr
Enter power in kilowatts (kW) to instantly convert to BTU per hour (BTU/hr).
If you work with HVAC systems, electric heaters, generators, or energy planning, you will often need to convert kilowatts (kW) into BTU per hour (BTU/hr). This page gives you a fast calculator and practical guidance so you can make the conversion with confidence.
How to convert kilowatts to BTU/hr
The standard conversion is straightforward:
That means each 1 kilowatt of power is equivalent to approximately 3,412.142 BTU/hr of heat transfer rate.
Example conversion
Suppose a unit is rated at 5 kW.
So, 5 kW is about 17,061 BTU/hr when rounded to the nearest whole number.
Why this conversion matters
- HVAC sizing: Air conditioners and heat pumps are often specified in BTU/hr, while electrical loads are frequently listed in kW.
- Heater comparisons: Electric resistance heaters may show kW ratings, but product literature might use BTU/hr.
- Energy budgeting: Engineers and facility managers use both SI and imperial units depending on region and standards.
- Equipment matching: Proper conversion helps avoid under-sizing or over-sizing systems.
Quick kW to BTU/hr reference table
| kW | BTU/hr |
|---|---|
| 1 | 3,412.14 |
| 2 | 6,824.28 |
| 2.5 | 8,530.36 |
| 3 | 10,236.43 |
| 3.5 | 11,942.50 |
| 4 | 13,648.57 |
| 5 | 17,060.71 |
| 7.5 | 25,591.07 |
| 10 | 34,121.42 |
| 15 | 51,182.13 |
| 20 | 68,242.84 |
BTU vs BTU/hr: what is the difference?
This is a common source of confusion. A BTU is a unit of energy. BTU/hr is a rate of energy transfer (power), just like watts or kilowatts. Since kW is a unit of power, it must be converted to BTU/hr, not plain BTU, unless you also include time.
Common mistakes to avoid
- Using 3,400 as a rough shortcut without noting rounding impact.
- Mixing up cooling tons, kW, and BTU/hr without clear conversion steps.
- Forgetting whether values are input power or output capacity.
- Ignoring manufacturer specifications when precision matters.
Frequently asked questions
How many BTU/hr are in 1 kW?
Exactly by conversion constant: 1 kW = 3,412.142 BTU/hr.
Can I use this for air conditioners and heat pumps?
Yes, for unit conversion. But equipment performance (like SEER, EER, COP, and operating conditions) can affect real-world results, so use manufacturer data for final design decisions.
Is this conversion exact?
The constant is defined and reliable for engineering calculations. Minor differences you see online are usually due to rounding.
Final takeaway
The kilowatts to BTU calculator above gives you a quick and accurate conversion for everyday planning. Enter your kW value, click calculate, and use the result for HVAC checks, heating estimates, and energy comparisons.