🔄 Energy

HP to kW Converter

Convert horsepower (HP) to kilowatts (kW) instantly — or kW to HP. Used for motor sizing, comparing specifications and calculating running costs.

Common sizes: 1, 2, 3, 5, 7.5, 10, 15, 20, 25, 30, 40, 50, 75, 100 HP
To estimate running cost
📊 Conversion Results
Horsepower (HP)
—
Kilowatts (kW)
—
Watts (W)
—
kVA (at 0.85 PF)
—
Electricity Cost / Day
—
Electricity Cost / Month
—

HP to kW Formula

kW = HP × 0.746 HP = kW ÷ 0.746 1 HP = 0.746 kW = 746 W 1 kW = 1.341 HP

Common Motor Sizes

HPkWTypical Use
1 HP0.75 kWSmall fans, agitators
5 HP3.73 kWSmall pumps, compressors
10 HP7.46 kWMedium pumps, conveyors
20 HP14.9 kWLarge pumps, machinery
50 HP37.3 kWHeavy industrial drives
100 HP74.6 kWLarge compressors

🔗 Related Calculators

🏭 Motor Running Cost ⚙️ Motor Energy Cost ⚡ Electricity Cost 🔋 Power Factor

HP vs kW — What's the Difference?

Horsepower (HP) is the older unit of power still widely used for motors in India and globally. Kilowatt (kW) is the SI unit. Both measure the same thing — mechanical power output of the motor. The conversion factor is exactly 1 HP = 0.746 kW (metric horsepower is 0.735 kW, but electric motor HP always uses 0.746).

Why Indian Factories Still Use HP

Most older Indian machinery, pump manuals and motor nameplates list ratings in HP. The BEE (Bureau of Energy Efficiency) and IS standards now specify kW, but HP remains common on factory floors, electrician quotes and procurement orders. Knowing the conversion is essential for energy audits, motor selection and tariff calculations.

Electrical Input vs Mechanical Output

Remember: motor HP/kW is the mechanical output. The electrical input drawn from the grid is higher because of motor efficiency losses. A 10 HP (7.46 kW) motor running at 90% efficiency draws 7.46 ÷ 0.90 = 8.29 kW from the supply. Always use this for electricity cost calculations.

Worked Example — Convert 7.5 HP to kW

Formula: kW = HP × 0.746
kW = 7.5 × 0.746 = 5.595 kW ≈ 5.6 kW
In watts: 5.595 × 1000 = 5,595 W
Electrical input at 90% efficiency: 5.595 ÷ 0.90 = 6.22 kW drawn from the supply

The reverse is just as simple: to convert kW to HP, divide by 0.746. For example, an 11 kW motor is 11 ÷ 0.746 = 14.75 HP, which is sold as a standard 15 HP motor.

HP to kW Conversion Table (Full Chart)

Exact conversions at 1 HP = 0.746 kW. Find your motor size below, or use the calculator above for any value.

HPkWWatts
0.5 HP0.373 kW373 W
1 HP0.746 kW746 W
1.5 HP1.119 kW1,119 W
2 HP1.492 kW1,492 W
3 HP2.238 kW2,238 W
5 HP3.730 kW3,730 W
7.5 HP5.595 kW5,595 W
10 HP7.460 kW7,460 W
12.5 HP9.325 kW9,325 W
HPkWWatts
15 HP11.19 kW11,190 W
20 HP14.92 kW14,920 W
25 HP18.65 kW18,650 W
30 HP22.38 kW22,380 W
40 HP29.84 kW29,840 W
50 HP37.30 kW37,300 W
75 HP55.95 kW55,950 W
100 HP74.60 kW74,600 W
125 HP93.25 kW93,250 W

kW to HP Conversion Table

kWHPkWHP
0.5 kW0.67 HP7.5 kW10.05 HP
0.75 kW1.01 HP11 kW14.75 HP
1.5 kW2.01 HP15 kW20.11 HP
2.2 kW2.95 HP22 kW29.49 HP
3.7 kW4.96 HP37 kW49.60 HP
5.5 kW7.37 HP55 kW73.73 HP

Note: motor nameplate kW is the mechanical output. Standard IEC motor frames (0.75, 1.5, 2.2, 3.7, 5.5, 7.5, 11, 15, 22, 30, 37, 45, 55, 75 kW) map to the nearest HP size.

Frequently Asked Questions

Multiply horsepower by 0.746: kW = HP × 0.746. For example, 10 HP × 0.746 = 7.46 kW. To convert the other way, divide: HP = kW ÷ 0.746.

1 HP equals 0.746 kW, or 746 watts, for mechanical and electrical horsepower (used for electric motors). Metric horsepower (PS), seen in some vehicle specs, is slightly less at 0.7355 kW.

7.5 HP equals 7.5 × 0.746 = 5.595 kW, usually rounded to 5.6 kW. It is a common size for medium pumps and compressors.

5 HP equals 5 × 0.746 = 3.73 kW. For reference: 1 HP = 0.746 kW, 2 HP = 1.49 kW, 3 HP = 2.24 kW and 10 HP = 7.46 kW.

Mechanical and electrical horsepower are both about 745.7 W (0.746 kW) and are used for electric motors. Metric horsepower (PS or CV) is 735.5 W (0.7355 kW), seen mainly in vehicle engine specs. For motor sizing and energy calculations, always use 1 HP = 0.746 kW.

No. The HP/kW rating is the mechanical output. The electrical input from the supply is higher because of efficiency losses. A 10 HP (7.46 kW) motor at 90% efficiency draws 7.46 ÷ 0.90 = 8.29 kW from the grid. Use the input figure for electricity cost — try our Motor Running Cost calculator.

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