How many kW is 10,000 BTU/hr?

10,000 BTU/hr equals about 2.93 kW. The exact value is 10,000 × 0.00029307107 = 2.9307 kW.

How many BTU/hr is 1 kW?

1 kilowatt equals 3,412.142 BTU/hr. A 3 kW heater produces about 10,236 BTU/hr of heat.

How many kW is a 12,000 BTU AC?

A 12,000 BTU/hr (one-ton) AC produces 3.517 kW of cooling. Electrical draw is separate and typically 1.0–1.2 kW at SEER 14.

How many kW is a 24,000 BTU AC?

24,000 BTU/hr equals 7.034 kW of cooling capacity, common for a 2-ton residential AC.

Is kW the same as kWh?

No. kW is power (a rate), and kWh is energy (a quantity). Running a 1 kW device for one hour uses 1 kWh. BTU/hr converts to kW, not kWh.

Why is BTU/hr used instead of kW in U.S. HVAC?

U.S. HVAC industry grew up on the Imperial System and kept BTU/hr for equipment labels. The rest of the world uses kW for the same quantity.

Can I estimate electricity cost from BTU/hr?

Only indirectly. Convert BTU/hr to kW to get cooling capacity, then divide by the efficiency (EER or COP) to get electrical kW. Multiply by hours and electricity price for cost.

Is this the same as BTU to watts?

Yes, scaled. 1 BTU/hr = 0.29307107 W = 0.00029307107 kW. The watt and kilowatt conversions use the same base factor with a 1,000× scale shift.

BTU/hr to kW Converter

Interactive

Scale explorer

Drag the slider or click a tier to see where your BTU/hr value lands on the equipment scale — with live kW output.

BTU per hour

12,000

BTU/hr

Kilowatts

3.5169

kW

Closest tier:1-ton AC— Residential benchmark

Visual scale

Where kW sits on the global power scale

Click any bar to make it the reference. Every other power unit shows how many of the reference value it equals.

Log scale (×10 between gridlines)

Click any bar to set as reference

Reference: 1 kW (1,000 W). Other bars show how many of this reference each value equals.

Fundamentals

What is BTU/hr to kW?

BTU/hr to kW converts British Thermal Units per hour to kilowatts by multiplying the BTU/hr value by 0.00029307107. One BTU/hr equals 0.29307107 watts, and 1,000 watts make one kilowatt, so the two forms of the conversion are P(kW) = P(BTU/hr) × 0.00029307107 or P(kW) = P(BTU/hr) / 3412.142. The conversion lets U.S. HVAC and heating specs align with the international SI standard used by most of the world.

A BTU per hour is a rate of thermal energy in the Imperial System. A kilowatt is a rate of power in the International System of Units (SI) equal to 1,000 watts or 1,000 joules per second. Both measure power, so they convert through a single fixed ratio.

The ratio 0.00029307107 comes from the BTU definition (1,055.05585 joules) divided by 3,600 seconds per hour, then divided again by 1,000 to scale watts into kilowatts.

Most U.S. HVAC nameplates show BTU/hr, while European, Asian, and Australian specs use kW. The same physical unit appears under two different labels — the converter translates between them without loss.

Formula

BTU/hr to kW formula

BTU/hr → kW

P(kW) = P(BTU/hr) × 0.00029307107

kW → BTU/hr

P(BTU/hr) = P(kW) × 3412.142

Worked example

Convert a 12,000 BTU/hr one-ton air conditioner to kilowatts. European and metric spec sheets use the kW value to describe the same equipment.

Start

12,000 BTU/hr

Apply

× 0.000293

Result

≈ 3.5169 kW

How to convert BTU/hr to kW

Three steps complete the conversion:

01

Read the BTU/hr value

Take the BTU/hr rating from the spec label, manual, or product page of the HVAC or heating unit.

02

Multiply by 0.00029307107

Apply the fixed conversion factor. Dividing by 3,412.142 returns the same result.

03

Record in kilowatts

Use kW for metric comparisons, European specs, and large-system sizing.

Applications

When to convert BTU/hr to kW

Real-world scenarios where this conversion shows up in engineering, HVAC, and equipment specification work.

Match U.S. to European HVAC specs

Align BTU/hr nameplates with kW ratings used on European product sheets.

Heater output comparison

Compare electric heater wattage to gas-heater BTU/hr on the same kW scale.

Engineering reports

Submit building cooling loads in kW for LEED, ASHRAE, and ISO documentation.

Generator load planning

Estimate generator sizing in kW after converting building BTU/hr loads.

Efficiency calculations

Compute EER and COP by dividing cooling kW by electrical input kW.

Guidance

Tips and common pitfalls

Do not confuse kW with kWh

kW is power (rate); kWh is energy (quantity). A 3 kW heater running for 2 hours uses 6 kWh.

Thermal kW is not electrical draw

12,000 BTU/hr of cooling = 3.517 kW of heat moved, but the AC only draws about 1.0–1.2 kW of electricity at SEER 14.

Round at the end

Apply the full 0.00029307107 factor, then round to 2–3 decimal places once — not between intermediate steps.

Reference

BTU/hr to kW conversion table

BTU per hour (BTU/hr)	Kilowatts (kW)
100 BTU/hr	0.029307 kW
500 BTU/hr	0.146536 kW
1,000 BTU/hr	0.293071 kW
2,000 BTU/hr	0.586142 kW
5,000 BTU/hr	1.4654 kW
8,000 BTU/hr	2.3446 kW
10,000 BTU/hr	2.9307 kW
12,000 BTU/hr	3.5169 kW
15,000 BTU/hr	4.3961 kW
18,000 BTU/hr	5.2753 kW
24,000 BTU/hr	7.0337 kW
36,000 BTU/hr	10.5506 kW
48,000 BTU/hr	14.0674 kW
60,000 BTU/hr	17.5843 kW
100,000 BTU/hr	29.3071 kW

In practice

Industry context and practical notes

Why kW dominates outside the U.S.

SI was adopted by the General Conference on Weights and Measures in 1960 and most national HVAC standards followed within two decades. By the 1990s, every European country plus Japan, Korea, Australia, and most of Asia-Pacific mandated SI on commercial HVAC nameplates. The U.S. is the lone holdout — and even here, ASHRAE 90.1 quietly publishes parallel SI tables for every imperial calculation. Modern equipment manufacturers print both kW and BTU/hr on the same nameplate to serve global markets without producing two separate runs.

Where engineers cross the boundary daily

U.S.-based MEP firms working on multinational projects — data centers, pharmaceutical plants, embassies — translate BTU/hr load calculations to kW on every submittal. The same applies to imported equipment: a German chiller specced at 350 kW is sold to a U.S. building owner who knows it as a 99.5-ton machine. The conversion is so routine that experienced engineers do it mentally: divide BTU/hr by 3,412 for kW, divide by 12,000 for tons. The arithmetic is fixed; the cultural and procurement context is what makes the conversion necessary.

Did you know

James Prescott Joule and William Thomson (Lord Kelvin) established the energy-power equivalence that makes this a fixed-ratio conversion. The factor has not changed since the BTU was standardized in 1956.

Questions

Frequently asked

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