HP to kW Conversion Formula with Calculations [Horsepower to kilowatts]

HP to kW formula is used to convert horsepower to kilowatts. Basically, HP is a mechanical unit of power, whereas the kW is an electrical unit of power. The equations below explains the relationship between both units:

HP to KW Formulas
Mechanical (Imperial Horsepower) 1 HP = 0.7457 kW
Electrical Horsepower 1 HP = 0.746 kW
Metric Horsepower 1 HP = 0.735 kW
Boiler Horsepower 1 HP = 9.8125 kW
Hydraulic Horsepower 1 HP = 0.7457 kW
Air horsepower 1 HP = 0.7457 kW

Mechanical Horsepower

One mechanical horsepower equals the 0.7457 kW. Whenever a mechanical HP is given multiply it with 0.7457 to obtain kW.

1 HP(I) = 0.7457 kW

Examples: Convert 25 HP to Mechanical kW.

Solution: 25 HP = 25 * 0.7457 kW = 18.6425 kW

For Electrical Calculations

In Electrical calculations often 1 HP is taken as 0.746 kW. An example is 3 Phase induction motor current calculations where we used 746 kW.

1 HP(E) = 0.746 kW

Example: Convert 1/2 HP to kW

Solution 1/2 HP = 1/2 * 0.746 kW = 0.373 kW

Metric Horsepower

The metric horspower equals 0.735 kW.

1 HP (M) = 0.735 kW

Example: Convert 30 HP to kW.

Solution: 30 HP = 30 * 0.735 kW = 22.05 kW

Boiler Horspower

The boiler horspower equals 9.8125 kW.

1 HP (S) = 9.8125 kW

Example: Convert 50 HP (S) to kW.

Solution: 50 HP (S) = 50 * 9.8125 kW = 490.625
The table below displays various conversions in above case.

HP Mechanical HP to kW Electrical HP to kW Metric HP to kW Boiler HP to kW
0.125 0.0932125 0.09325 0.091875 1.2265625
0.25 0.186425 0.1865 0.18375 2.453125
0.5 0.37285 0.373 0.3675 4.90625
0.75 0.559275 0.5595 0.55125 7.359375
1 0.7457 0.746 0.735 9.8125
1.25 0.932125 0.9325 0.91875 12.265625
1.5 1.11855 1.119 1.1025 14.71875
1.75 1.304975 1.3055 1.28625 17.171875
2 1.4914 1.492 1.47 19.625
2.25 1.677825 1.6785 1.65375 22.078125
2.5 1.86425 1.865 1.8375 24.53125
2.75 2.050675 2.0515 2.02125 26.984375
3 2.2371 2.238 2.205 29.4375
3.25 2.423525 2.4245 2.38875 31.890625
3.5 2.60995 2.611 2.5725 34.34375
3.75 2.796375 2.7975 2.75625 36.796875
4 2.9828 2.984 2.94 39.25
4.25 3.169225 3.1705 3.12375 41.703125
4.5 3.35565 3.357 3.3075 44.15625
4.75 3.542075 3.5435 3.49125 46.609375
5 3.7285 3.73 3.675 49.0625
5.25 3.914925 3.9165 3.85875 51.515625
5.5 4.10135 4.103 4.0425 53.96875
5.75 4.287775 4.2895 4.22625 56.421875
6 4.4742 4.476 4.41 58.875
6.25 4.660625 4.6625 4.59375 61.328125
6.5 4.84705 4.849 4.7775 63.78125
6.75 5.033475 5.0355 4.96125 66.234375
7 5.2199 5.222 5.145 68.6875
7.25 5.406325 5.4085 5.32875 71.140625
7.5 5.59275 5.595 5.5125 73.59375
7.75 5.779175 5.7815 5.69625 76.046875
8 5.9656 5.968 5.88 78.5
8.25 6.152025 6.1545 6.06375 80.953125
8.5 6.33845 6.341 6.2475 83.40625
8.75 6.524875 6.5275 6.43125 85.859375
9 6.7113 6.714 6.615 88.3125
9.25 6.897725 6.9005 6.79875 90.765625
9.5 7.08415 7.087 6.9825 93.21875
9.75 7.270575 7.2735 7.16625 95.671875
10 7.457 7.46 7.35 98.125
10.25 7.643425 7.6465 7.53375 100.578125
10.5 7.82985 7.833 7.7175 103.03125
10.75 8.016275 8.0195 7.90125 105.484375
11 8.2027 8.206 8.085 107.9375
11.25 8.389125 8.3925 8.26875 110.390625
11.5 8.57555 8.579 8.4525 112.84375
11.75 8.761975 8.7655 8.63625 115.296875
12 8.9484 8.952 8.82 117.75
12.25 9.134825 9.1385 9.00375 120.203125
12.5 9.32125 9.325 9.1875 122.65625
12.75 9.507675 9.5115 9.37125 125.109375
13 9.6941 9.698 9.555 127.5625
13.25 9.880525 9.8845 9.73875 130.015625
13.5 10.06695 10.071 9.9225 132.46875
13.75 10.253375 10.2575 10.10625 134.921875
14 10.4398 10.444 10.29 137.375
14.25 10.626225 10.6305 10.47375 139.828125
14.5 10.81265 10.817 10.6575 142.28125
14.75 10.999075 11.0035 10.84125 144.734375
15 11.1855 11.19 11.025 147.1875
15.25 11.371925 11.3765 11.20875 149.640625
15.5 11.55835 11.563 11.3925 152.09375
15.75 11.744775 11.7495 11.57625 154.546875
16 11.9312 11.936 11.76 157
16.25 12.117625 12.1225 11.94375 159.453125
16.5 12.30405 12.309 12.1275 161.90625
16.75 12.490475 12.4955 12.31125 164.359375
17 12.6769 12.682 12.495 166.8125
17.25 12.863325 12.8685 12.67875 169.265625
17.5 13.04975 13.055 12.8625 171.71875
17.75 13.236175 13.2415 13.04625 174.171875
18 13.4226 13.428 13.23 176.625
18.25 13.609025 13.6145 13.41375 179.078125
18.5 13.79545 13.801 13.5975 181.53125
18.75 13.981875 13.9875 13.78125 183.984375
19 14.1683 14.174 13.965 186.4375
19.25 14.354725 14.3605 14.14875 188.890625
19.5 14.54115 14.547 14.3325 191.34375
19.75 14.727575 14.7335 14.51625 193.796875
20 14.914 14.92 14.7 196.25
20.25 15.100425 15.1065 14.88375 198.703125
20.5 15.28685 15.293 15.0675 201.15625
20.75 15.473275 15.4795 15.25125 203.609375
21 15.6597 15.666 15.435 206.0625
21.25 15.846125 15.8525 15.61875 208.515625
21.5 16.03255 16.039 15.8025 210.96875
21.75 16.218975 16.2255 15.98625 213.421875
22 16.4054 16.412 16.17 215.875
22.25 16.591825 16.5985 16.35375 218.328125
22.5 16.77825 16.785 16.5375 220.78125
22.75 16.964675 16.9715 16.72125 223.234375
23 17.1511 17.158 16.905 225.6875
23.25 17.337525 17.3445 17.08875 228.140625
23.5 17.52395 17.531 17.2725 230.59375
23.75 17.710375 17.7175 17.45625 233.046875
24 17.8968 17.904 17.64 235.5
24.25 18.083225 18.0905 17.82375 237.953125
24.5 18.26965 18.277 18.0075 240.40625
24.75 18.456075 18.4635 18.19125 242.859375

One thought on “HP to kW Conversion Formula with Calculations [Horsepower to kilowatts]

  • March 15, 2018 at 6:25 pm
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    Can you share about magnetic contactors and its functions

    Reply

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