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仕事率の単位換算

hp と kW、ワットと馬力、BTU/h と冷凍トンを換算します。機械馬力（745.7 W）と仏馬力（735.5 W）に対応しています。

更新日 検証済みの例：5

変換元の単位で数値を入力するか、単位付きの数値を入力します
試す
変換後の値
kW
変換後の値: 74.5699871582 kW
有効桁数：12；最も近い値へ、等距離ならゼロから遠い値へ
単位換算
100 hp ≈ 74.56999 kW
換算係数
0.745699871582
正確さ
正確

100 hpは約74.56999 kWです（正確には74.569987158227022 kW）。 1単位の英馬力は約0.7456999 kWです。

同じ量を各単位で表示

hp100 hpkW74.56999 kW
100 hpを各仕事率単位で表示 行数：10
単位値定義
watt (W)74,569.99基本単位
milliwatt (mW)74,569,9901 mW = 0.001 W、正確な値
キロワット (kW)74.569991 kW = 1,000 W、正確な値
megawatt (MW)0.074569991 MW = 1,000,000 W、正確な値
gigawatt (GW)0.000074569991 GW = 1,000,000,000 W、正確な値
英馬力 (hp)1001 hp = 745.69987158227022 W、正確な値（機械馬力（550 ft·lbf/s））
metric horsepower (PS)101.3871 PS = 735.49875 W、正確な値
BTU per hour (BTU/h)254,443.41 BTU/h = 1,055.05585262/3,600 W、正確な値
ton of refrigeration (TR)21.203611 TR = 12,660,670.23144/3,600 W、正確な値
kilocalorie per hour (kcal/h)64,161.561 kcal/h = 4,184/3,600 W、正確な値
計算方法 S

  1. 英馬力からwattへ換算

    100 hp×745.69987158227022 Whp=74,569.9871582 W100\ \text{hp} \times 745.69987158227022\ \tfrac{\text{W}}{\text{hp}} = 74{,}569.9871582\ \text{W}

    1 hp = 745.69987158227022 W、正確な値（機械馬力（550 ft·lbf/s））

  2. wattからキロワットへ換算

    74,569.9871582 W÷1,000 WkW=74.5699871582 kW74{,}569.9871582\ \text{W} \div 1{,}000\ \tfrac{\text{W}}{\text{kW}} = 74.5699871582\ \text{kW}

    1 kW = 1,000 W、正確な値

  3. 統合した換算係数

    1 hp=745.699871582270221,000 kW≈0.745699871582 kW1\ \text{hp} = \frac{745.69987158227022}{1{,}000}\ \text{kW} \approx 0.745699871582\ \text{kW}

    両方の単位の定義が正確で、変換後の値は有限小数なので、表示されるすべての桁が正確です。

仕事率の単位換算について

Every power unit is a fixed number of watts (joules per second). Mechanical horsepower is 550 foot-pounds-force per second, which works out at exactly 745.69987158227022 W; metric horsepower (PS) is 75 kilogram-force metres per second, exactly 735.49875 W. A ton of refrigeration is 12,000 BTU/h, about 3.517 kW.

The default converts a 100 hp engine to 74.57 kW. Car specifications are the usual reason: European registration documents give engine power in kW while brochures quote PS or hp, and 100 kW is 134.1 hp or 136.0 PS.

Air-conditioner ratings in BTU/h or tons describe cooling output, not the electricity drawn: a 1.5-ton unit moves 18,000 BTU/h (5.28 kW) of heat, and its electrical input depends on its efficiency rating.

計算例

100 hp in kW

値
100 hp
変換元
horsepower (hp)
変換先
kilowatt (kW)
変換後の値
74.5699871582 kW
正確さ
正確

照合元：1 hp = 550 ft·lbf/s = 550 × 0.3048 × 4.4482216152605 W = 745.69987158227022 W (NIST SP 811 App. B)

1 kW in hp

値
1 kW
変換元
kilowatt (kW)
変換先
horsepower (hp)
変換後の値
1.3410220896 hp

照合元：1000 / 745.69987158227022 (Python 3.8 fractions from the legal definitions)

12,000 BTU/h is one ton of refrigeration

値
12,000 BTU/h
変換元
BTU per hour (BTU/h)
変換先
ton of refrigeration (TR)
変換後の値
1 TR

照合元：1 ton of refrigeration = 12,000 BTU/h (NIST SP 811 App. B)

Zero power

値
0 W
変換元
watt (W)
変換先
horsepower (hp)
変換後の値
0 hp
正確さ
正確

照合元：0 × any factor = 0

よくある質問

How many watts are in a horsepower?

745.7 W for mechanical horsepower (550 ft·lbf/s), 735.5 W for metric horsepower (PS or CV), and exactly 746 W for the electric horsepower used to rate electric motors; NIST SP 811 lists all three. Mechanical and metric horsepower differ by 1.4%, enough to matter when comparing car figures.

How do I convert kW to hp?

Multiply by 1.34102 for mechanical horsepower or by 1.35962 for metric PS. A 150 kW engine is 201.2 hp or 203.9 PS. To go from hp to kW, multiply by 0.7457, so the default 100 hp is 74.57 kW.

What is the difference between hp, bhp and PS?

hp and bhp use the same 745.7 W unit; “brake” horsepower means the power was measured at the engine's output shaft, before transmission losses. PS (Pferdestärke) is metric horsepower, 735.5 W, also written CV or ch. A car quoted at 150 PS makes 147.9 hp or 110.3 kW.

What does a 1.5-ton air conditioner mean?

It removes 18,000 BTU of heat per hour, which is 5.28 kW of cooling. A ton of refrigeration is 12,000 BTU/h, the rate that melts one short ton (2,000 lb) of ice in 24 hours, because ice absorbs 144 BTU per pound as it melts. The electricity it draws is lower and depends on its efficiency rating.

How many BTU/h is 1 kW?

3,412.14 BTU/h. One watt is 3.41214 BTU/h, so a 2 kW electric heater gives out 6,824 BTU/h, and a 12,000 BTU/h air conditioner is rated at 3.517 kW of cooling. The factor is the same as between kWh and BTU because both sides are divided by one hour.

「仕事率の単位換算」の精度はどのくらいですか？

精度は入力値と計算方法の前提に依存します。十進演算には有効数字50桁を使いますが、推定、数値計算手法、元データの精度はそれより低い場合があります。表示の丸め処理でこれらの制約がなくなるわけではありません。 独立した出典の解答と照合した計算例：5。 例えば、「100 hp in kW」は1 hp = 550 ft·lbf/s = 550 × 0.3048 × 4.4482216152605 W = 745.69987158227022 W (NIST SP 811 App. B)と照合しています。

この計算方法の出典は何ですか？

NIST SP 811 (2008), Guide for the Use of the SI, Appendix B — conversion factors; NIST Handbook 44, Appendix C — General tables of units of measurement.

この計算機について

xto=xfrom×ffromftof=one unit expressed in W\begin{gathered} x_{\text{to}} = x_{\text{from}} \times \dfrac{f_{\text{from}}}{f_{\text{to}}} \\ f = \text{one unit expressed in } \text{W} \end{gathered}

出典

  1. NIST SP 811 (2008), Guide for the Use of the SI, Appendix B — conversion factors
  2. NIST Handbook 44, Appendix C — General tables of units of measurement

出典と照合済み

この計算機には、独立した出典の解答を使った計算例が 5 件あります。テストに組み込まれており、ここでも実行できます。

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