Horsepower to Watts Conversion Calculator

Horsepower to Watts Calculator

Select hp unit type: Mechanical horsepower Electrical horsepower Metric horsepower Enter horsepower:

Result in watts: W

A Horsepower (HP) to Watts (W) calculator converts between mechanical power (HP) and the SI unit of power (W). This conversion is vital in automotive, electrical engineering, industrial equipment, and appliance ratings.

Key Definitions

• Horsepower (HP) - Imperial unit of power (1 HP ≈ 745.7 W)

• Watt (W) - SI unit of power (1 W = 1 joule/second)

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Conversion Formulas

1. HP to Watts (Mechanical Horsepower)

$$P(W)=P(HP)\times 745.7$$

Example:

• Convert 5 HP to Watts:

  $$5\times 745.7=3,728.5\text{ W}$$

2. Watts to HP

$$P(HP)=\frac{P(W)}{745.7}$$

Example:

• Convert 2,000 W to HP:

  $$2,000÷745.7\approx 2.68\text{ HP}$$

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Conversion Table (HP ⇆ W)

Horsepower (HP)	Watts (W)
0.1 HP	74.57 W
0.5 HP	372.85 W
1 HP	745.7 W
2 HP	1,491.4 W
5 HP	3,728.5 W
10 HP	7,457 W
20 HP	14,914 W
50 HP	37,285 W
100 HP	74,570 W

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Types of Horsepower

1. Mechanical HP (Standard) = 745.7 W

2. Metric HP (PS, CV) = 735.5 W

3. Electrical HP = 746 W

4. Boiler HP = 9,809.5 W

Metric HP (PS) to Watts

$$P(W)=P(PS)\times 735.5$$

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How to Use the Calculator

1. Enter HP → Get Watts (Multiply by 745.7)

2. Enter Watts → Get HP (Divide by 745.7)

Example Calculations:

• 7.5 HP to Watts:

  $$7.5\times 745.7=5,592.75\text{ W}$$

• 10,000 W to HP:

  $$10,000÷745.7\approx 13.41\text{ HP}$$

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Practical Applications

✅ Car Engines (Power output specifications)
✅ Industrial Motors (Electric motor ratings)
✅ HVAC Systems (Compressor & fan power)
✅ Power Tools (Drills, saws, etc.)
✅ Aircraft Performance (Thrust calculations)

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Comparison of Power Units

Unit	Watts Equivalent
1 HP (Mechanical)	745.7 W
1 HP (Metric)	735.5 W
1 HP (Electric)	746 W
1 kW	1,000 W
1 MW	1,000,000 W

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FAQ

1. How many Watts are in 1 HP?

✅ 1 HP = 745.7 Watts (Mechanical)

2. Is HP or Watts more accurate?

🔹 Watts are the SI standard, preferred for technical calculations.

3. Why do some countries use PS instead of HP?

🔹 Metric system preference (1 PS = 735.5 W, common in Europe).

4. How to convert 250 HP to Watts?

$$250\times 745.7=186,425\text{ W}$$

5. What's the difference between HP and kW?

🔹 1 HP = 0.7457 kW (Use kW for electrical systems).