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Category Engineering Converters

Density in g/cm³Supports standard decimals and scientific notation (e.g., 1.2e-4)

Density in kg/m³

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About

Density conversions often trip up engineers and students due to the magnitude difference between CGS (centimeter-gram-second) and SI (meter-kilogram-second) systems. While the arithmetic involves a factor of 1000, the practical application requires precision. Materials scientists dealing with alloys, or chemists calculating molar concentrations, frequently encounter data in g/cm³ that must be normalized to kg/m³ for fluid dynamics simulations or structural load calculations.

This tool addresses specific pain points in data handling. Research papers and CSV exports often format numbers in scientific notation (e.g., 2.7e3 or 1.5E-2). Manual conversion of these formats introduces human error. By strictly applying the conversion factor ρ × 1000, we ensure that the order of magnitude remains correct, which is critical when determining buoyancy, purity, or mass-to-volume ratios in industrial processing.

Formulas

The relationship between these two units is linear and defined by the conversion between centimeters to meters and grams to kilograms.

ρ_SI = ρ_CGS × 1000

Where:

ρ_SI is density in kg/m³.
ρ_CGS is density in g/cm³.

Derivation from base units:

1 gcm³ × 1 kg1000 g × 100³ cm³1 m³ = 1000 kgm³

Reference Data

Material	Density (g/cm³)	Density (kg/m³)	State @ STP
Hydrogen	0.000089	0.089	(g)
Air (Dry)	0.001225	1.225	(g)
Cork	0.24	240	(s)
Lithium	0.534	534	(s)
Ethanol	0.789	789	(l)
Ice	0.917	917	(s)
Water (Pure)	1.00	1000	(l)
Sea Water	1.025	1025	(l)
Aluminum	2.70	2700	(s)
Diamond	3.51	3510	(s)
Titanium	4.506	4506	(s)
Iron	7.874	7874	(s)
Copper	8.96	8960	(s)
Silver	10.49	10490	(s)
Lead	11.34	11340	(s)
Mercury	13.534	13534	(l)
Gold	19.30	19300	(s)
Osmium	22.59	22590	(s)

Frequently Asked Questions

No. The conversion factor of 1000 is a constant mathematical relationship between units of mass and length. However, the density of the material itself changes with temperature. If you measure density at 25°C, the converted value is valid only at 25°C.

Specific gravity is a dimensionless ratio usually relative to water. Since the density of water is approximately 1 g/cm³ (at 4°C), specific gravity is often numerically identical to density in g/cm³. You can generally input the specific gravity directly into this tool to get the density in kg/m³.

Computers store floating-point numbers in binary. When converting 1.2e-5, the system may output a standard decimal or a normalized scientific format depending on the magnitude. This tool standardizes the output to ensure readability for engineering applications.

Yes. However, gas densities are very low. For example, Air is roughly 0.001225 g/cm³. Ensure your input precision is high enough to capture these small values, or use scientific notation (e.g., 1.225e-3).