Power Converter
Watts to horsepower
Power Converter
Convert between power measurement units
Converted Power
About Power Converter
The Power Converter helps you convert between different power units including watts, kilowatts, megawatts, horsepower, and BTU per hour. Perfect for electrical engineering, mechanical systems, HVAC, and automotive applications.
Whether you're calculating appliance power consumption, engine output, or cooling capacity, our converter provides accurate results instantly.
How to Use This Power Converter
Step 1: Enter the numeric value you want to convert.
Step 2: Select the from unit (W, kW, MW, HP, or BTU/h).
Step 3: Select the to unit you want to convert to.
Step 4: Click "Convert" to see the converted value.
Step 5: Use the swap button (🔄) to quickly reverse the units.
Step 6: Click Reset to clear all inputs and start a new conversion.
Why Use a Power Converter?
✓ Electrical Engineering
Convert between watts, kilowatts, and megawatts for electrical systems. Calculate power consumption and capacity.
✓ Automotive & Engines
Convert horsepower to kW and vice versa. Compare engine outputs across different measurement systems.
✓ HVAC & Cooling
Convert BTU per hour to watts for air conditioning and heating systems. Calculate cooling capacity.
✓ Appliance Comparison
Compare power ratings of different appliances. Understand energy consumption in common units.
Power Units Explained
Watt (W)
SI unit of power. 1 watt = 1 joule/second. Used for small devices (LED bulbs, phone chargers, laptops).
Kilowatt (kW)
1,000 watts. Used for larger appliances (AC, water heater, EV motors). Common unit for electricity bills.
Horsepower (HP)
1 HP = 745.7 W. Used for engines, motors, and cars. Originally defined by James Watt for steam engines.
BTU per hour (BTU/h)
British Thermal Unit per hour. Used for HVAC and cooling systems. 1 BTU/h = 0.293 W.
Real-World Power Examples
| Item | Power (W) | Power (HP) | Power (BTU/h) |
|---|---|---|---|
| LED Bulb | 10W | 0.013 HP | 34 BTU/h |
| Laptop | 50W | 0.067 HP | 171 BTU/h |
| Refrigerator | 150W | 0.20 HP | 512 BTU/h |
| Car Engine | 74,570W | 100 HP | 254,500 BTU/h |
| AC (1.5 Ton) | 1500W | 2.01 HP | 5,118 BTU/h |
Power Conversion Formulas
| From | To | Formula |
|---|---|---|
| kW | HP | × 1.34102 |
| HP | kW | × 0.7457 |
| W | HP | × 0.001341 |
| BTU/h | W | × 0.293071 |
| MW | kW | × 1000 |
| BTU/h | HP | × 0.000393 |
Common Power Conversions
| From | To | Multiply By |
|---|---|---|
| kW | HP | 1.34102 |
| HP | kW | 0.7457 |
| W | HP | 0.001341 |
| BTU/h | W | 0.293071 |
Frequently Asked Questions
1 horsepower (HP) = 745.7 watts. Divide watts by 745.7. Example: 1000 W ÷ 745.7 = 1.34 HP.
1 kilowatt (kW) = 1,000 watts. Used for larger power measurements like appliances and cars. 1 HP = 0.7457 kW.
1 mechanical horsepower = 745.7 watts. Metric horsepower (PS) = 735.5 watts. This converter uses mechanical HP.
Watt measures power (rate of energy). Watt-hour measures energy (power × time). 100W bulb for 10 hours = 1,000 Wh = 1 kWh.
1 BTU per hour = 0.293071 watts. Multiply BTU/h by 0.293071 to get watts. Example: 1000 BTU/h × 0.293071 = 293.07 W.
LED bulb: 10W, Laptop: 50W, TV: 100-200W, Refrigerator: 150W, AC: 1500W, Microwave: 1000W, Washing machine: 500W, Water heater: 2000W, Iron: 1000W.
Power (W) = Voltage (V) × Current (A). Example: 230V × 5A = 1150W. For AC circuits, add power factor: P = V × I × PF (power factor usually 0.8-0.95).
Energy (kWh) = Power (kW) × Hours used. Example: a 1500W AC run for 5 hours = 1.5 kW × 5h = 7.5 kWh. Multiply the kWh by your electricity board's per-unit rate to estimate the cost — check a recent bill for your exact rate, since it varies by state and slab.
VA (volt-amperes) is apparent power; watts is real power. For purely resistive loads they're equal, but for motors and electronics the power factor makes watts lower than VA — commonly watts ≈ VA × 0.8. Sizing a generator or UPS on VA alone can under-estimate the load it can actually run; check both figures against your equipment's rated wattage.
Built and maintained by Sanjay Singh · Founder, Numrexo
Builds and maintains the calculators on Numrexo. Each tool's formula is documented on its page, and any reference source it relies on is listed under Method and references.
Last updated: · Calculations run in your browser. Nothing you enter is sent to us or stored.
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