Convertisseur de masse volumique

Convert g/cm³ to kg/m³, kg/m³ to lb/ft³ and lb/gal (ppg), and g/mL to kg/L, with exact factors from the 1959 pound and foot.

Mis à jour 29 septembre 2026Exemples vérifiés : 4

Valeur convertie

lb/ft³

Chiffres significatifs : 12 ; Au plus proche, égalités en s’éloignant de zéro

Conversion: 1 g/cm³ ≈ 62.42796 lb/ft³
Facteur de conversion: 62.4279605761
Exactitude: Définitions exactes, décimale périodique

1 g/cm³ vaut environ 62.42796 lb/ft³.

La même quantité exprimée dans chaque unité

1 g/cm³ dans chaque unité de Masse volumique Lignes : 7

Unité	Valeur	Définition
kilogram per cubic metre (kg/m³)	1,000	Unité de base
gram per cubic centimetre (g/cm³)	1	1 g/cm³ = 1,000 kg/m³, exact
gram per millilitre (g/mL)	1	1 g/mL = 1,000 kg/m³, exact
kilogram per litre (kg/L)	1	1 kg/L = 1,000 kg/m³, exact
pound per cubic foot (lb/ft³)	62.42796	1 lb/ft³ = 0.45359237/0.028316846592 kg/m³, exact
pound per cubic inch (lb/in³)	0.03612729	1 lb/in³ = 0.45359237/0.000016387064 kg/m³, exact
pound per US gallon (lb/gal)	8.345404	1 lb/gal = 0.45359237/0.003785411784 kg/m³, exact

Comment le calcul est effectué S

Convertir gram per cubic centimetre en kilogram per cubic metre
$1\ \text{g/cm$^{3}$} \times 1{,}000\ \tfrac{\text{kg/m$^{3}$}}{\text{g/cm$^{3}$}} = 1{,}000\ \text{kg/m$^{3}$}$
1 g/cm³ = 1,000 kg/m³, exact
Convertir kilogram per cubic metre en pound per cubic foot
$1{,}000\ \text{kg/m$^{3}$} \div \tfrac{0.45359237}{0.028316846592}\ \tfrac{\text{kg/m$^{3}$}}{\text{lb/ft$^{3}$}} = 62.4279605761\ \text{lb/ft$^{3}$}$
1 lb/ft³ = 0.45359237/0.028316846592 kg/m³, exact
Facteur combiné
$1\ \text{g/cm$^{3}$} = \frac{1{,}000}{\tfrac{0.45359237}{0.028316846592}}\ \text{lb/ft$^{3}$} \approx 62.4279605761\ \text{lb/ft$^{3}$}$
Les deux unités sont définies exactement, mais la valeur convertie est une décimale périodique ; elle est affichée avec 12 chiffres significatifs.

À propos de Convertisseur de masse volumique

Density is mass per volume, so each unit is a mass unit divided by a volume unit, held here as kilograms per cubic metre. The metric units differ by powers of 1,000 (1 g/cm³ = 1 g/mL = 1 kg/L = 1,000 kg/m³), and the imperial ones follow from the exact pound and foot: 1 lb/ft³ = 16.0185 kg/m³.

The default converts 1 g/cm³, close to the density of water, to 62.428 lb/ft³. Engineers use lb/ft³ (pcf) for soils and concrete, drillers use lb/gal (ppg) for drilling mud, and materials data sheets use g/cm³.

Density changes with temperature, and the converter only changes units. Pure water is densest near 4 °C at 999.97 kg/m³ and is 998.2 kg/m³ at 20 °C, so “1 g/cm³ for water” is right to within 0.2%.

Exemples détaillés

1 g/cm³ in lb/ft³

Valeur: 1 g/cm³
De: gram per cubic centimetre (g/cm³)
Vers: pound per cubic foot (lb/ft³)

Valeur convertie: 62.4279605761 lb/ft³

Source de vérification : 1000 kg/m³ ÷ (0.45359237 kg / 0.028316846592 m³) = 14158423296/226796185 (Python 3.8 fractions from the legal definitions)

1000 kg/m³ in g/mL

Valeur: 1000 kg/m³
De: kilogram per cubic metre (kg/m³)
Vers: gram per millilitre (g/mL)

Valeur convertie: 1 g/mL

Source de vérification : 1000 kg/m³ = 1 g/cm³ = 1 g/mL

1 lb/gal in kg/m³

Valeur: 1 lb/gal
De: pound per US gallon (lb/gal)
Vers: kilogram per cubic metre (kg/m³)

Valeur convertie: 119.826427317 kg/m³

Source de vérification : 0.45359237 / 0.003785411784 (Python 3.8 fractions from the legal definitions)

1 lb/in³ in g/cm³

Valeur: 1 lb/in³
De: pound per cubic inch (lb/in³)
Vers: gram per cubic centimetre (g/cm³)

Valeur convertie: 27.6799047102 g/cm³

Source de vérification : 0.45359237 kg / 0.000016387064 m³ ÷ 1000 (Python 3.8 fractions from the legal definitions)

Questions

How do I convert g/cm³ to kg/m³?

Multiply by 1,000. A cubic metre holds 10⁶ cubic centimetres and a kilogram is 1,000 grams, so 1 g/cm³ = 1,000 kg/m³. Aluminium at 2.70 g/cm³ is 2,700 kg/m³, and steel at about 7.85 g/cm³ is 7,850 kg/m³. g/mL and kg/L are the same size as g/cm³.

What is specific gravity?

The ratio of a substance's density to the density of water, so it has no unit. Referenced to water at 4 °C (999.97 kg/m³), specific gravity equals the density in g/cm³ to within 0.003%: a liquid of 0.80 g/cm³ has a specific gravity of 0.80. Other references, such as water at 60 °F, change the fourth significant digit.

How do I convert lb/ft³ to kg/m³?

Multiply by 16.0185. A pound is 0.45359237 kg and a cubic foot 0.028316846592 m³, both exact, so 1 lb/ft³ = 16.01846337 kg/m³. Normal-weight concrete at about 150 lb/ft³ is about 2,400 kg/m³, and 1,000 kg/m³ is 62.43 lb/ft³.

What does ppg mean for drilling mud?

Pounds per US gallon, the density unit of oilfield drilling fluids. 1 lb/gal is 119.826 kg/m³, so fresh water at 20 °C is 8.33 ppg and a 12 ppg mud is 1,438 kg/m³, or 1.44 g/cm³. Mud weight sets the pressure the fluid column exerts at the bottom of the well.

Is the density of water exactly 1 g/cm³?

No, but close. Pure water peaks at 999.97 kg/m³ near 4 °C and is 998.2 kg/m³ at 20 °C. The gram was first defined in 1795 as the mass of 1 cm³ of water, and from 1901 to 1964 the litre was defined as the volume of 1 kg of water, which is why the numbers nearly coincide.

Quelle est la précision de « Convertisseur de masse volumique » ?

La précision dépend de vos données et des hypothèses de la méthode. Le calcul décimal utilise 50 chiffres significatifs, mais les estimations, méthodes numériques et données sources peuvent être moins précises ; l’arrondi affiché ne supprime pas ces limites. Exemples résolus vérifiés à partir de sources indépendantes : 4. Par exemple, « 1 g/cm³ in lb/ft³ » est vérifié à l’aide de 1000 kg/m³ ÷ (0.45359237 kg / 0.028316846592 m³) = 14158423296/226796185 (Python 3.8 fractions from the legal definitions).

D’où vient cette méthode ?

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.

À propos de ce calculateur

\begin{gathered} x_{\text{to}} = x_{\text{from}} \times \dfrac{f_{\text{from}}}{f_{\text{to}}} \\ f = \text{one unit expressed in } \text{kg/m$^{3}$} \end{gathered}

Sources

Vérifié avec les références

Ce calculateur comprend 4 exemples résolus dont les réponses proviennent de sources indépendantes. Ils font partie de la suite de tests et peuvent aussi être exécutés ici.