加速度変換

Convert g-force to m/s², m/s² to g, ft/s² and gal (cm/s²), using standard gravity g₀ = 9.80665 m/s² exactly.

更新日 2026年9月29日検証済みの例：4

変換後の値

m/s²

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 g = 9.80665 m/s²
換算係数: 9.80665
正確さ: 正確

1 gは正確に9.80665 m/s²です。

同じ量を各単位で表示

1 gを各加速度単位で表示行数：4

単位	値	定義
metre per second squared (m/s²)	9.80665	基本単位
standard gravity (g)	1	1 g = 9.80665 m/s²、正確な値
foot per second squared (ft/s²)	32.17405	1 ft/s² = 0.3048 m/s²、正確な値
gal (galileo)	980.665	1 Gal = 0.01 m/s²、正確な値

計算方法 S

standard gravityからmetre per second squaredへ換算
$1\ \text{g} \times 9.80665\ \tfrac{\text{m/s$^{2}$}}{\text{g}} = 9.80665\ \text{m/s$^{2}$}$
1 g = 9.80665 m/s²、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。

加速度変換について

Acceleration is change of speed per unit time, and each unit here is a fixed number of metres per second squared. The g of g-force is standard gravity, g₀ = 9.80665 m/s², fixed by the 3rd CGPM in 1901; a foot per second squared is 0.3048 m/s², and a gal (galileo) is 1 cm/s².

The default converts 1 g to 9.80665 m/s². Vehicle performance is the everyday use: a car that reaches 100 km/h from rest in 3 seconds averages 9.26 m/s², or 0.94 g.

Standard gravity is a conventional value. Real free-fall acceleration runs from about 9.78 m/s² at the equator to 9.83 m/s² at the poles, and geophysicists measure its local variations in milligals.

計算例

1 g in m/s²

値: 1 g
変換元: standard gravity (g)
変換先: metre per second squared (m/s²)

変換後の値: 9.80665 m/s²

照合元：Standard gravity g₀ = 9.80665 m/s² exactly (CGPM 1901)

1 g in ft/s²

値: 1 g
変換元: standard gravity (g)
変換先: foot per second squared (ft/s²)

変換後の値: 32.1740485564 ft/s²

照合元：9.80665 / 0.3048 = 196133/6096 (Python 3.8 fractions from the legal definitions)

1 gal in m/s²

値: 1 Gal
変換元: gal (galileo)
変換先: metre per second squared (m/s²)

変換後の値: 0.01 m/s²

照合元：1 Gal = 1 cm/s² (NIST SP 811 App. B)

9.80665 m/s² is exactly 1 g

値: 9.80665 m/s²
変換元: metre per second squared (m/s²)
変換先: standard gravity (g)

変換後の値: 1 g
正確さ: 正確

照合元：Definition of g₀

よくある質問

What is 1 g in m/s²?

Exactly 9.80665 m/s², the standard acceleration of gravity adopted by the 3rd General Conference on Weights and Measures in 1901. It equals 32.174 ft/s². Local gravity differs slightly; 9.80665 is the convention used for g-force and for units such as the kilogram-force.

How do I work out g-force from a 0–60 or 0–100 time?

Divide the speed gained by the time, then divide by 9.80665. 0–60 mph (26.8224 m/s) in 3 s averages 8.94 m/s², or 0.91 g; 0–100 km/h (27.78 m/s) in 3 s averages 9.26 m/s², or 0.94 g. The peak acceleration during the run is higher than this average.

What is a gal (Gal) in acceleration?

One centimetre per second squared, 0.01 m/s², named after Galileo. Earth's surface gravity is about 980 Gal, so gravity surveys work in milligals, where 1 mGal is about one millionth of g. The symbol is Gal, and the unit has nothing to do with the gallon.

How do I convert ft/s² to m/s²?

Multiply by 0.3048, the exact number of metres in a foot. 32.174 ft/s² is 9.80665 m/s² (1 g), and 10 ft/s² is 3.048 m/s². To go from m/s² to ft/s², divide by 0.3048, which is the same as multiplying by 3.28084.

Is gravity 9.81 m/s² everywhere?

No. Free-fall acceleration is about 9.780 m/s² at the equator and 9.832 m/s² at the poles, because the Earth spins and bulges at the equator, and it falls slightly with altitude. 9.81 is 9.80665 rounded, the conventional value between those extremes that g-force is measured against.

「加速度変換」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 g in m/s²」はStandard gravity g₀ = 9.80665 m/s² exactly (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{m/s$^{2}$} \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。