Power Converter
Watts, kilowatts, horsepower and BTU/hour — the units that make comparing a car engine's rating to a household appliance's rating, or an air conditioner's cooling capacity to an electric motor, actually possible.
Inputs
Result
1.341022 Horsepower
How it works
- 11 Kilowatt → base = 1,000
- 2Base → Horsepower = 1.341022
How the power converter works
All units convert through watts as the base — 1 Kilowatt = 1,000 W, 1 Megawatt = 1,000,000 W, 1 Horsepower = 745.7 W, 1 BTU/hour = 0.293071 W.
Worked example: a 150 horsepower engine, converted to kilowatts
- 150 × 745.7 = 111,855 W.
- 111,855 ÷ 1,000 ≈ 111.86 kW.
Common mistakes to avoid
Assuming all countries define 'horsepower' identically
There are actually several slightly different historical horsepower definitions (mechanical/imperial horsepower, metric horsepower, and others) that differ by a small percentage — for most everyday comparisons the difference is minor, but it's not literally universal across every country and industry standard.
Using an air conditioner's BTU rating to directly infer its electrical power draw
An air conditioner's BTU/hour rating describes its cooling capacity (heat removed), not its electrical power consumption directly — a unit's electrical efficiency (its coefficient of performance) determines how much actual electrical power in watts it draws to achieve that stated cooling capacity.
Frequently asked questions
Why is horsepower still used for vehicle engines when kilowatts is the SI standard?
It's largely historical convention and market familiarity — many countries and industries continue to market and compare vehicle and engine power in horsepower even as most formal engineering work uses the SI standard of kilowatts internally.
What does a BTU/hour rating on an air conditioner actually tell me?
It describes how much heat the unit can remove from a space per hour — a higher BTU/hour rating generally means it can cool a larger space, though actual cooling effectiveness also depends on insulation, climate and other factors.
How is power different from energy in this context?
Power (watts, horsepower) is a rate — how fast energy is being used or produced; energy (joules, kWh) is the total amount — this converter handles rate (power) units specifically, while the separate Energy Converter handles total-amount units.
Why does converting horsepower to watts use the specific factor 745.7?
This is the standard 'mechanical horsepower' definition's exact conversion factor to watts — a formally fixed historical value now used as the standard reference for this conversion.
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