Your Electric Drill Is Rated at 1.5 Kilowatts, But the Specification Sheet Says 2 Horsepower
You're shopping for tools, and different manufacturers list power in different units. One drill says 1,500 watts, another says 2 horsepower. Are they equivalent? Which is more powerful? Or you're installing solar panels and wondering what "5 kilowatts of capacity" actually means in practical terms. Or you're researching electric vehicles and see one listed as 200 kW, and you're comparing it to a 250-horsepower car. These power comparisons require a converter that understands all the major units.
What This Calculator Does
Our power converter handles all common power measurement units: watts (W), kilowatts (kW), horsepower (hp), BTU per hour (BTU/hr), and other power ratings. Whether you're comparing appliances, understanding vehicle specifications, evaluating equipment capacity, or working with physics data, this tool shows you the equivalent instantly. Enter a power value in any unit and see what it equals in all others.
How to Use This Calculator
Select your starting unit. If you're reading an air conditioner rated at 3.5 kilowatts, select kilowatts and enter 3.5. The calculator instantly shows you the equivalent in watts, horsepower, BTU/hr, and other power units. Curious what a 200-horsepower engine produces in kilowatts? Select horsepower, enter 200, and see the kilowatt equivalent. Change your input and all conversions update immediately.
The Math Behind the Conversion
Power conversions are based on fixed relationships. One watt is one joule per second-the standard SI unit of power. One kilowatt equals 1,000 watts. One horsepower equals 745.7 watts. One BTU per hour equals 0.293071 watts. These definitions come from historical standards and the relationship between mechanical and electrical power.
Let's work through examples. A 1.5-kilowatt drill: 1.5 × 1,000 = 1,500 watts. Converting to horsepower: 1,500 ÷ 745.7 = 2.01 horsepower. So yes, 1.5 kW ≈ 2 hp. An electric vehicle with a 200-kilowatt motor: 200 × 1,000 = 200,000 watts. Converting to horsepower: 200,000 ÷ 745.7 = 268 horsepower-quite powerful.
For heating and cooling, a 5,000 BTU/hr air conditioner equals 5,000 × 0.293071 = 1,465 watts or about 1.5 kilowatts. A gas heater rated at 40,000 BTU/hr equals 40,000 × 0.293071 = 11.7 kilowatts. For solar panels, a 5-kilowatt system can produce 5,000 watts of power when the sun is optimal-enough to power a typical home.
Understanding power helps you assess equipment capacity and electricity usage. Higher-power appliances consume more electricity, which affects your utility bills. Our converter handles all of this instantly, but now you know the math behind it.
Vehicle Performance and Electric Vehicle Comparisons
Traditional cars are rated in horsepower. Electric vehicles are rated in kilowatts. To compare performance, you need conversions. A 200-kW electric motor produces 268 horsepower. A traditional car with a 300-horsepower engine produces about 224 kilowatts. Understanding power output helps you assess acceleration, towing capacity, and overall performance.
Electrical Appliance and Energy Usage
Household appliances are rated in watts or kilowatts. An oven might draw 5 kilowatts, a dishwasher 1.8 kilowatts, a microwave 1 kilowatt. Understanding power consumption helps you evaluate energy bills and identify power-hungry devices. A device using 1,000 watts for 1 hour consumes 1 kilowatt-hour, which costs roughly $0.12-$0.15 depending on regional electricity rates. The power converter helps you estimate costs.
HVAC and Heating/Cooling Equipment
Heating and air conditioning equipment is rated in BTU/hr or kilowatts. A 12,000 BTU/hr air conditioner equals about 3.5 kilowatts. A 24,000 BTU/hr unit equals about 7 kilowatts. Matching equipment capacity to your space requires understanding these ratings and how much power you need. The power converter helps you select appropriately-sized equipment.
Common Conversion Reference
For quick reference, remember these power conversions. One horsepower equals 746 watts, or roughly 0.75 kilowatts. A 1-kilowatt appliance uses as much power as roughly 1.3 horsepower. Most household circuits provide 15 amps at 120 volts, which equals 1,800 watts or 1.8 kilowatts. Most larger appliances use 240-volt circuits providing up to 50 amps or 12 kilowatts. For heating/cooling, 1 kilowatt ≈ 3,412 BTU/hr. A 5-kilowatt solar panel system produces about 6.7 horsepower worth of power at peak. These benchmarks help you understand equipment capacity and electricity consumption.
Frequently Asked Questions
How many watts are in a kilowatt?
One kilowatt equals 1,000 watts. So 2.5 kW = 2,500 watts, and 0.5 kW = 500 watts.
How many watts is one horsepower?
One horsepower equals 745.7 watts, or roughly 746 watts. This is useful for comparing mechanical and electrical power.
What is 100 watts in horsepower?
100 watts ÷ 745.7 = 0.134 horsepower. A 100-watt light bulb (though these are rare now) uses the power equivalent of a small fraction of a horsepower.
How many watts does a 2-horsepower motor use?
2 × 745.7 = 1,491.4 watts, or roughly 1.5 kilowatts.
What does a 5-kilowatt solar panel system mean?
It means the system can produce 5,000 watts of power under optimal sun conditions. Over a year, the system might produce 6,000-8,000 kilowatt-hours depending on location and weather.
How many BTU/hr is 10 kilowatts?
10 × 3,412 = 34,120 BTU/hr. This is a large heating or cooling system.
Related Calculators
Our energy converter handles the relationship between power and energy (power is energy per unit time). Our temperature converter relates to thermal power and heating/cooling efficiency.