kW to HP Calculator: Convert Kilowatts to Horsepower (Free Tool)
You are looking at an electric motor. The nameplate says 15 kW. But you think in horsepower. How much is that?
Or you are reading a car specification. It says 300 horsepower. You want to know the kilowatts.
Kilowatts and horsepower both measure power. But they use different units.
Today, I give you a free kW to HP Calculator.
You enter the value. Select the conversion direction. The calculator shows the answer instantly.
The calculator converts:
- kW to metric horsepower (PS)
- kW to mechanical horsepower (hp)
- kW to electrical horsepower
Let me explain how to convert between kilowatts and horsepower.
What are Kilowatts and Horsepower? (Simple Explanation)
Kilowatt (kW) is the metric unit of power. 1 kW = 1,000 watts. It is used worldwide for electrical power, motors, and generators.
Horsepower (hp) is the imperial unit of power. It was invented by James Watt to compare steam engines to draft horses.
The three types of horsepower:
| Type | Abbreviation | Conversion (1 kW to hp) |
|---|---|---|
| Mechanical (US) | hp | 1.341 |
| Metric (Europe) | PS | 1.360 |
| Electrical | hp (E) | 1.340 |
Why This kW to HP Calculator Matters
Here is why you need to convert between kW and hp.
Reason 1: Motor specifications
Motors are rated in kW in most countries. But many people think in horsepower. Convert to understand the power.
Reason 2: Car specifications
European cars list power in kW. US drivers think in hp. Convert for comparison.
Reason 3: Generator sizing
Generators are rated in kW. Engines are rated in hp. To match an engine to a generator, you need conversion.
Reason 4: Appliance power
Large appliances (HVAC, pumps) may use either unit. Convert to compare.
Reason 5: International standards
Different countries use different units. Convert to communicate clearly.
The Conversion Formulas
kW to mechanical horsepower:
hp = kW × 1.341
kW to metric horsepower (PS):
PS = kW × 1.360
kW to electrical horsepower:
hp(E) = kW × 1.340
To convert horsepower to kW:
kW = hp ÷ 1.341 (for mechanical)
LIVE kW to HP Calculator
Enter a value. The calculator shows all three horsepower types instantly.
🔄 kW to HP Calculator
⚡ Value to Convert
📐 Conversion Direction
🔄 kW to HP Calculator
Convert kilowatts to horsepower (mechanical, metric, electrical)
⚡ Value to Convert
📐 Conversion Direction
kW → HP HP → kW
💪 MECHANICAL HORSEPOWER (hp)
0.00 hp
🏎️ METRIC HORSEPOWER (PS)
0.00 PS
⚡ ELECTRICAL HORSEPOWER (hp(E))
0.00 hp(E)
0%
💡 1 kW = 1.341 hp (mechanical) = 1.360 PS = 1.340 hp(E)
📌 Mechanical horsepower (US) • Metric horsepower (PS) • Electrical horsepower (motors)
How to Use This kW to HP Calculator
Follow these 3 simple steps.
Step 1: Enter the Value
Enter the number you want to convert (e.g., 75).
Step 2: Select Conversion Direction
- kW → HP – Convert kilowatts to horsepower
- HP → kW – Convert horsepower to kilowatts
Step 3: Read the Results
The calculator shows three horsepower values:
- Mechanical horsepower (US standard)
- Metric horsepower (European standard)
- Electrical horsepower (motor rating)
Real Examples: Different Scenarios
Example 1: 75 kW electric motor
- Direction: kW → HP
Results:
- Mechanical: 75 × 1.341 = 100.6 hp
- Metric: 75 × 1.360 = 102.0 PS
- Electrical: 75 × 1.340 = 100.5 hp(E)
Example 2: 300 hp car engine
- Direction: HP → kW
Results:
- kW = 300 ÷ 1.341 = 223.7 kW
Example 3: 50 kW generator
- Direction: kW → HP
- Mechanical: 67.1 hp
Example 4: 150 hp tractor
- Direction: HP → kW
- kW = 150 ÷ 1.341 = 111.9 kW
Common Conversions Table
| kW | Mechanical HP | Metric PS | Electrical hp(E) |
|---|---|---|---|
| 1 | 1.34 | 1.36 | 1.34 |
| 5 | 6.71 | 6.80 | 6.70 |
| 10 | 13.41 | 13.60 | 13.40 |
| 15 | 20.12 | 20.40 | 20.10 |
| 20 | 26.82 | 27.20 | 26.80 |
| 30 | 40.23 | 40.80 | 40.20 |
| 50 | 67.05 | 68.00 | 67.00 |
| 75 | 100.58 | 102.00 | 100.50 |
| 100 | 134.10 | 136.00 | 134.00 |
| 150 | 201.15 | 204.00 | 201.00 |
| 200 | 268.20 | 272.00 | 268.00 |
Kilowatt to Horsepower: The History
James Watt (1736-1819) was a Scottish inventor. He improved the steam engine.
He needed a way to market his engines. He compared them to horses. He calculated that a horse could lift 550 pounds one foot in one second.
That became 1 horsepower.
1 mechanical horsepower = 550 ft-lb/s = 745.7 watts
Today, the metric system uses kilowatts (1 kW = 1,000 W). But horsepower remains common for engines and motors.
Types of Horsepower
Mechanical horsepower (hp):
- Used in the United States
- 1 hp = 745.7 W
- Formula: hp = kW × 1.341
Metric horsepower (PS):
- Used in Europe (Pferdestärke = horse strength)
- 1 PS = 735.5 W
- Formula: PS = kW × 1.360
Electrical horsepower (hp(E)):
- Used for electric motors
- 1 hp(E) = 746 W
- Formula: hp(E) = kW × 1.340
Motor Power Ratings
Electric motors are rated in both kW and hp.
Common motor sizes:
| kW | hp |
|---|---|
| 0.75 | 1 |
| 1.5 | 2 |
| 2.2 | 3 |
| 3.7 | 5 |
| 5.5 | 7.5 |
| 7.5 | 10 |
| 11 | 15 |
| 15 | 20 |
| 18.5 | 25 |
| 22 | 30 |
| 30 | 40 |
| 37 | 50 |
| 45 | 60 |
| 55 | 75 |
| 75 | 100 |
Frequently Asked Questions (FAQs)
1. How many horsepower is 1 kW?
1 kW = 1.341 mechanical horsepower = 1.360 PS = 1.340 electrical horsepower.
2. How many kW is 1 horsepower?
1 mechanical horsepower = 0.746 kW.
3. What is the difference between PS and hp?
PS (metric horsepower) is slightly higher: 1 PS = 0.986 hp.
4. Why are there three different horsepower units?
Historical reasons. Different industries use different standards.
5. Which horsepower should I use for car engines?
Use mechanical hp for US cars. Use PS for European cars.
6. How do I convert hp to kW for a motor?
hp × 0.746 = kW (approximately).
7. Is electric motor hp the same as mechanical hp?
Electrical horsepower is slightly different (1 hp = 746 W vs 745.7 W). The difference is negligible.
8. What is boiler horsepower?
A different unit used for steam boilers. 1 boiler hp = 9.81 kW.
9. How do I convert kW to hp for a generator?
Use mechanical hp: kW × 1.341.
10. Can I use the calculator for both AC and DC motors?
Yes. The conversion is independent of AC or DC.
Common Mistakes
Mistake #1: Using the wrong conversion factor
Always use 1.341 for mechanical hp. Some sources use 1.34, which is less accurate.
Mistake #2: Confusing metric and mechanical horsepower
PS is not the same as hp. They differ by about 1.4%.
Mistake #3: Rounding too early
Keep several decimal places in intermediate calculations.
Mistake #4: Forgetting the conversion direction
kW to hp multiplies. hp to kW divides.
Mistake #5: Using electrical hp for engine ratings
Electrical hp is for electric motors. Mechanical hp is for engines.
Quick Reference: kW to hp (Mechanical)
| kW | hp |
|---|---|
| 1 | 1.34 |
| 2 | 2.68 |
| 3 | 4.02 |
| 4 | 5.36 |
| 5 | 6.71 |
| 10 | 13.41 |
| 20 | 26.82 |
| 30 | 40.23 |
| 40 | 53.64 |
| 50 | 67.05 |
| 60 | 80.46 |
| 70 | 93.87 |
| 80 | 107.28 |
| 90 | 120.69 |
| 100 | 134.10 |
Final Thoughts
Converting between kilowatts and horsepower is easy with the right formula.
My kW to HP Calculator gives you:
- Mechanical horsepower (US standard)
- Metric horsepower (European PS)
- Electrical horsepower (motors)
- Reverse conversion (hp to kW)
Bookmark this page. Use it for motors, engines, generators, and car specs.
The next time you see “75 kW”, you will know it is about 100 horsepower.
Disclaimer: This is an educational tool. For exact specifications, consult manufacturer data.
External Links (Authority Backlinks):
- Wikipedia – Horsepower{:target=”_blank” rel=”noopener noreferrer”}
- Wikipedia – Watt{:target=”_blank” rel=”noopener noreferrer”}
- Wikipedia – Electric motor{:target=”_blank” rel=”noopener noreferrer”}
Read more
- Wire / Cable Size Calculator – Find Correct Gauge (Free Tool)
- 3-Phase Power Calculator – Calculate kW, kVA, kVAR (Free Tool)
- Amps to Watts Calculator – Convert Electrical Power (Free Tool)
- Voltage Drop Calculator – Electrical Wire Sizing (Free Tool)
- Ohm’s Law Calculator – Calculate Voltage, Current, Resistance (Free Tool)
- Height Weight Percentile Calculator: Track Child Growth (Free Tool)
- Parrot Genetic Calculator: Predict Offspring Colors (Free Tool)
- Blox Fruits Calculator 2026 – Trade Value List & Tool (Free)
- Bond Duration Calculation Formula – Macaulay & Modified Duration
- Refrigerant Charge Calculator – Free HVAC Tool (R22, R410A, R134A)
- Superheat Calculator – HVAC Refrigerant Superheat (Free Tool)
- Persona 3 Reload Fusion Calculator – Complete Velvet Room Guide (2026)
- Newborn Weight Loss Calculator – Normal Range & Alerts (Free Tool)
- Cubic Meters to Pounds Converter – Volume to Weight (Free Tool)
- Inches to Centimeters Converter – Instant Length Conversion (Free Tool)
- Calorie Deficit Calculator – Lose Weight Safely (Free Tool)
- Valorant Shop Checker – Check Your Daily Skins Online (Free)