12000 BTU to kW
Updated
Convert 12,000 BTU/hr to kW with an exact formula, worked arithmetic, HVAC chart, and thermal-versus-electrical guidance.
Direct answer: 12,000 BTU/hr = 3.517 kW.
Quick converter
Kilowatts (thermal)
12,000 BTU/hr = 3,516.85 W of thermal capacity. Updates as you type.
A 12,000 BTU/hr air conditioner is commonly described as a one-ton unit. Its cooling capacity is 3.51685284 kW, usually rounded to 3.517 kW. This is thermal power: the rate at which heat is removed or supplied. It is the value to compare with a chiller, heat pump, or furnace capacity on a metric specification sheet. The number is independent of equipment efficiency.
Calculate it by multiplying the hourly heat rate by 0.00029307107. Thus 12,000 x 0.00029307107 = 3.51685284 kW. The same capacity is 3,516.85 W, 1 refrigeration ton, and about 4.716 mechanical horsepower. A label saying 12,000 BTU/hr describes heat moved, not electricity consumed by the compressor. For a 12,000 BTU/hr AC with EER 11, electrical input is 12,000 / 11 = 1,090.9 W, or about 1.09 kW.
Worked example
- 1. Start
12,000 BTU/hr
- 2. Apply the formula
12,000 x 0.00029307107
- 3. Round the result
12,000 BTU/hr = 3.517 kW
Practical guidance
Room and appliance context
A 12,000 BTU/hr room air conditioner is a common benchmark for roughly 450–550 square feet under standard eight-foot-ceiling guidance. Sun exposure, insulation, windows, cooking heat, and occupants can move the required capacity substantially, so use a room-load calculation before buying. For heaters, the same 3.517 kW is heat output; an electric resistance heater would draw about 3.517 electrical kW, while a heat pump can deliver that thermal output with lower input depending on COP.
Running cost and electrical load
To estimate cost, use the equipment's rated input rather than 3.517 kW. At EER 11, the example input is 1.091 kW. Running eight hours uses about 8.73 kWh before cycling and part-load effects; multiply that energy by your tariff. Breaker and wiring selection must follow the nameplate MCA/MOCP and local code, because startup current and compressor power factor are not captured by a thermal conversion.
Why the last digits matter
The exact international-table factor is 0.29307107 W per BTU/hr. Keeping the full factor until the final step gives 3.51685284 kW. A source using 0.000293 can show 3.516 kW, which is a rounding choice rather than a different physical result. Always keep “per hour” in the unit: BTU is energy, while BTU/hr is power.
Choosing the right comparison
Compare cooling capacity with the thermal kW on a European datasheet, and compare electricity use with input kW, EER, COP, or SEER. A 3.517 kW thermal rating is not a promise that the machine draws 3.517 kW. The distinction matters for generator sizing, solar design, and utility bills.
Common mistakes to avoid
- Confusing thermal kW with electrical input kW
- Dropping “per hour” and converting BTU (energy) as though it were power
- Sizing solely from square footage without accounting for sun, insulation, or occupancy
12000 BTU to kW chart
| BTU/hr | kW | Tons | HP |
|---|---|---|---|
| 9,000 | 2.638 | 0.75 | 3.537 |
| 12,000 | 3.517 | 1 | 4.716 |
| 18,000 | 5.275 | 1.5 | 7.074 |
| 24,000 | 7.034 | 2 | 9.432 |
| 30,000 | 8.792 | 2.5 | 11.79 |
| 36,000 | 10.551 | 3 | 14.149 |
| 48,000 | 14.067 | 4 | 18.865 |
| 60,000 | 17.584 | 5 | 23.581 |
Common questions
Is 12,000 BTU/hr exactly 3.517 kW?
The unrounded result is 3.51685284 kW, so 3.517 kW is the practical three-decimal value.
Does thermal kW equal electrical kW?
No. Thermal kW is capacity. Electrical kW is input and depends on EER, COP, or the nameplate.
What formula is used?
Thermal kW = BTU/hr x 0.00029307107, or BTU/hr / 3412.142.
How many tons is 12,000 BTU/hr?
It is one refrigeration ton because one ton is defined as 12,000 BTU/hr.
Can I use this for an energy bill?
Use rated electrical input for billing; this conversion gives heating or cooling capacity.
What room can 12,000 BTU/hr cool?
A common reference range is about 450–550 square feet with standard conditions; climate and heat gains can require a different size.
How many kW is a 1.5 ton air conditioner?
A 1.5 ton unit is 18,000 BTU/hr, which is 5.275 thermal kW. At an EER of 11 it draws roughly 1.64 kW of electricity (18,000 / 11 = 1,636 W).
How do I convert kW back to BTU/hr?
Multiply kW by 3,412.142. For example 3.51685 kW x 3,412.142 = 12,000 BTU/hr, so the conversion works in both directions.
Is 12,000 BTU/hr the same as 12,000 BTU?
No. BTU is a quantity of energy and BTU/hr is a rate of power. 12,000 BTU is about 3.517 kWh of energy, while 12,000 BTU/hr is 3.517 kW of power.
More size guides
Continue with the BTU to kW converter, compare BTU/hr to tons of refrigeration, or check the BTU to horsepower converter.