Power Converter: hp to kW, PS, BTU/h and Tons

Type a power in any unit and see it in hp, kW, PS/CV, BTU/h, tons of refrigeration and kcal/h at once, with the exact factor.

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    For estimating and educational purposes only. Results are approximate and are not a substitute for a licensed professional, the manufacturer's instructions or your local code. Disclaimer

    Quick answers

    How Many kW Is 1 hp?How Many kW Is 12,000 BTU?How Many kW Is 1 Ton of Refrigeration?kW to hp: Convert kilowatts to horsepowerBTU/h to watts: Convert BTU per hour to wattsWatts to BTU/h: Convert watts to BTU per hourAll quick answers
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    hp, kW, PS and BTU/h: what each unit means

    The kilowatt is the SI unit and the one regulators use. The others are historical units that are still printed on spec sheets:

    • hp (mechanical) = 550 ft·lbf/s = 745.69987 W. US and UK engine ratings (SAE J1349 net hp).
    • hp (electric) = exactly 746 W. Used on US electric motor nameplates (NEMA).
    • PS / CV (metric hp) = 75 kgf·m/s = 735.49875 W. European and Latin American car specs (German PS, Spanish/Portuguese CV, French ch).
    • BTU/h and TR: heating and cooling capacity. 1 TR (ton of refrigeration) = 12,000 BTU/h = 3,516.85 W.
    1 hp = 0.745 699 872 kW 1 kW = 1.341022 hp 1 PS = 0.735 498 75 kW 1 kW = 1.359622 PS 1 hp = 1.01387 PS 1 TR = 3.516 853 kW 1 BTU/h = 0.2930711 W 1 kcal/h = 1.163 W

    hp to kW and PS conversion table

    hpkWPS
    1 hp0.74571.014
    5 hp3.7285.069
    10 hp7.45710.14
    25 hp18.6425.35
    50 hp37.2850.69
    100 hp74.57101.4
    150 hp111.9152.1
    200 hp149.1202.8
    300 hp223.7304.2
    500 hp372.8506.9

    Worked examples

    A European car rated at 150 PS: 150 × 0.73549875 = 110.32 kW, which is 147.9 hp. The metric horsepower is 1.4% smaller than the imperial one, so the PS figure always looks a little higher.

    A 24,000 BTU/h mini-split: 24,000 × 0.29307107 W = 7.034 kW of cooling (2 tons). That is the heat it moves, not the electricity it uses: with a typical efficiency (COP around 3) it draws roughly a third of that from the outlet.

    hp to kW conversion chart (1/4–500 hp)

    Mechanical horsepower converted to kilowatts, metric horsepower (PS) and BTU/h, for motors, engines and generators.

    Show full table
    hpkWPSBTU/h
    1/4 hp0.1864250.253467636.108
    1/3 hp0.2485670.337957848.145
    1/2 hp0.372850.5069351,272.22
    3/4 hp0.5592750.7604021,908.33
    1 hp0.74571.013872,544.43
    2 hp1.49142.027745,088.87
    3 hp2.23713.041617,633.3
    4 hp2.98284.0554810,177.7
    5 hp3.72855.0693512,722.2
    6 hp4.47426.0832215,266.6
    7 hp5.21997.0970917,811
    8 hp5.96568.1109620,355.5
    9 hp6.71139.1248322,899.9
    10 hp7.45710.138725,444.3
    12 hp8.948412.166430,533.2
    15 hp11.185515.20838,166.5
    20 hp14.91420.277450,888.7
    25 hp18.642525.346763,610.8
    30 hp22.37130.416176,333
    40 hp29.82840.5548101,777
    50 hp37.28550.6935127,222
    60 hp44.74260.8322152,666
    75 hp55.927576.0402190,833
    100 hp74.57101.387254,443
    125 hp93.2125126.734318,054
    150 hp111.855152.08381,665
    175 hp130.497177.427445,276
    200 hp149.14202.774508,887
    250 hp186.425253.467636,108
    300 hp223.71304.161763,330
    350 hp260.995354.854890,552
    400 hp298.28405.5481,017,773
    450 hp335.565456.2411,144,995
    500 hp372.85506.9351,272,217

    1 hp (mechanical) = 550 ft·lbf/s = 745.69987 W; 1 PS (metric hp, CV) = 735.49875 W; 1 BTU/h = 0.29307 W. US motor nameplates use the 746 W electric hp, a 0.04% difference. Values to 6 significant digits, as shown by the converter.

    kW to hp chart: IEC motor sizes

    Standard IEC motor ratings (0.18–400 kW) converted to mechanical horsepower and metric horsepower.

    Show full table
    kWhpPSW
    0.18 kW0.2413840.244732180
    0.25 kW0.3352560.339905250
    0.37 kW0.4961780.50306370
    0.55 kW0.7375620.747792550
    0.75 kW1.005771.01972750
    1.1 kW1.475121.495581,100
    1.5 kW2.011532.039431,500
    2.2 kW2.950252.991172,200
    3 kW4.023074.078863,000
    4 kW5.364095.438494,000
    5.5 kW7.375627.477925,500
    7.5 kW10.057710.19727,500
    11 kW14.751214.955811,000
    15 kW20.115320.394315,000
    18.5 kW24.808925.15318,500
    22 kW29.502529.911722,000
    30 kW40.230740.788630,000
    37 kW49.617850.30637,000
    45 kW60.34661.18345,000
    55 kW73.756274.779255,000
    75 kW100.577101.97275,000
    90 kW120.692122.36690,000
    110 kW147.512149.558110,000
    132 kW177.015179.47132,000
    160 kW214.564217.539160,000
    200 kW268.204271.924200,000
    250 kW335.256339.905250,000
    315 kW422.422428.281315,000
    355 kW476.063482.666355,000
    400 kW536.409543.849400,000

    1 hp (mechanical) = 550 ft·lbf/s = 745.69987 W; 1 PS (metric hp, CV) = 735.49875 W; 1 BTU/h = 0.29307 W. US motor nameplates use the 746 W electric hp, a 0.04% difference. Values to 6 significant digits, as shown by the converter.

    Frequently asked questions

    How many kW is 1 hp?

    1 mechanical horsepower is 0.7457 kW (745.7 W). An electric motor horsepower is exactly 746 W, and a metric horsepower (PS/CV) is 0.7355 kW.

    Is PS the same as hp?

    No. 1 PS (metric horsepower) is 735.5 W and 1 hp is 745.7 W, so 100 PS = 98.6 hp. The difference is about 1.4%.

    How many kW is a 12,000 BTU air conditioner?

    12,000 BTU/h is 3.517 kW of cooling (1 ton). It usually draws only about 1–1.3 kW of electricity, because it moves heat rather than making it.