力の単位変換

Convert kgf to newtons, lbf to N and kN to kgf or lbf, using standard gravity (9.80665 m/s²) and the exact pound-force of 4.4482216152605 N.

更新日 2026年9月29日検証済みの例：4

変換後の値

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: 1 kgf = 9.80665 N
換算係数: 9.80665
正確さ: 正確

1 kgfは正確に9.80665 Nです。

同じ量を各単位で表示

1 kgfを各力単位で表示行数：7

単位	値	定義
newton (N)	9.80665	基本単位
kilonewton (kN)	0.00980665	1 kN = 1,000 N、正確な値
dyne (dyn)	980,665	1 dyn = 0.00001 N、正確な値
pound-force (lbf)	2.204623	1 lbf = 4.4482216152605 N、正確な値
kilogram-force (kgf)	1	1 kgf = 9.80665 N、正確な値
ounce-force (ozf)	35.27396	1 ozf = 0.27801385095378125 N、正確な値
poundal (pdl)	70.93164	1 pdl = 0.138254954376 N、正確な値

計算方法 S

kilogram-forceからnewtonへ換算
$1\ \text{kgf} \times 9.80665\ \tfrac{\text{N}}{\text{kgf}} = 9.80665\ \text{N}$
1 kgf = 9.80665 N、正確な値
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。

力の単位変換について

Every force unit is a fixed number of newtons, and one newton accelerates 1 kg at 1 m/s². The gravitational units use standard gravity, g₀ = 9.80665 m/s², set by the 3rd CGPM in 1901: a kilogram-force is 9.80665 N and a pound-force is 0.45359237 kg × 9.80665 m/s² = 4.4482216152605 N, both exact.

The default converts 1 kgf to 9.80665 N. Loads marked in kilograms-force or tonnes-force and climbing or lifting gear rated in kilonewtons are the usual reasons to convert: 1 kN is 101.97 kgf or 224.81 lbf.

A kilogram is a mass and a newton a force, so “1 kg = 9.81 N” holds only under standard gravity. Real gravity runs from about 9.78 m/s² at the equator to 9.83 m/s² at the poles, a spread of 0.5%.

計算例

1 kgf in newtons

値: 1 kgf
変換元: kilogram-force (kgf)
変換先: newton (N)

変換後の値: 9.80665 N

照合元：1 kgf = 1 kg × 9.80665 m/s² (standard gravity, CGPM 1901)

1 lbf in newtons

値: 1 lbf
変換元: pound-force (lbf)
変換先: newton (N)

変換後の値: 4.44822161526 N
正確さ: 正確

照合元：0.45359237 kg × 9.80665 m/s² = 4.4482216152605 N (NIST SP 811 App. B)

1 kN in lbf

値: 1 kN
変換元: kilonewton (kN)
変換先: pound-force (lbf)

変換後の値: 224.8089431 lbf

照合元：1000 / 4.4482216152605 (Python 3.8 fractions from the legal definitions)

1 N in dynes

値: 1 N
変換元: newton (N)
変換先: dyne (dyn)

変換後の値: 100,000 dyn

照合元：1 dyn = 10⁻⁵ N (NIST SP 811 App. B)

よくある質問

How many newtons are in a kilogram?

A mass of 1 kg weighs 9.80665 N under standard gravity, which is the definition of 1 kilogram-force. The kilogram measures mass and the newton force, so the conversion needs an acceleration; 9.80665 m/s² is the conventional value fixed in 1901, and local gravity differs from it by up to about 0.3%.

How do I convert lbf to newtons?

Multiply by 4.4482216152605, usually rounded to 4.448. One pound-force is the weight of one pound (0.45359237 kg) under standard gravity, so the factor is exact. A 200 lbf load is 889.64 N, and 1 N is 0.224809 lbf.

How many kgf is 1 kN?

101.97 kgf. Multiply kilonewtons by 101.9716, or divide by 0.00980665, to get kilograms-force. A carabiner marked 22 kN is rated to 2,243 kgf, or 4,946 lbf, and a 5 kN anchor to 510 kgf. The factor is exact because the kilogram-force is defined with standard gravity, 9.80665 m/s².

What is the difference between a pound and a pound-force?

A pound (lb) is mass, 0.45359237 kg; a pound-force (lbf) is the weight of that mass under standard gravity, 4.4482216152605 N. On Earth a 10 lb object weighs about 10 lbf, which is why everyday speech uses one word for both. The poundal, 0.138255 N, is the force that accelerates 1 lb at 1 ft/s².

How many newtons does a person weigh?

A 70 kg person weighs 686.47 N under standard gravity (70 × 9.80665), which is 70 kgf or 154.3 lbf. Bathroom scales measure this force and divide by g to display kilograms, so a scale set up for standard gravity reads about 0.3% low at the equator and 0.3% high at the poles.

「力の単位変換」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：4。例えば、「1 kgf in newtons」は1 kgf = 1 kg × 9.80665 m/s² (standard gravity, CGPM 1901)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

\begin{gathered} x_{\text{to}} = x_{\text{from}} \times \dfrac{f_{\text{from}}}{f_{\text{to}}} \\ f = \text{one unit expressed in } \text{N} \end{gathered}

出典

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 4 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。