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Physics · Kinematic Metrics

Density Calculator

Calculate physical density, mass, or volume with interactive formula triangles, 30+ material database lookups, and buoyancy indicators.

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Kinematic Formula

Density (ρ) = Mass / Volume

Total Mass (m)

Total Volume (V)

Calculated density

1025.40 kg/m³

g/cm³1.0254

kg/L1.0254

lb/ft³64.01

lb/gal8.5574

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Buoyancy Check

Will it float in pure water (1.0 g/cm³)?

Sinks — 1.03× denser than water

🗄️ Materials Database

Air (Sea Level)Gas

0.001 g/cm³

HeliumGas

0.000 g/cm³

HydrogenGas

0.000 g/cm³

Pure WaterLiquid

1.000 g/cm³

SeawaterLiquid

1.025 g/cm³

GasolineLiquid

0.740 g/cm³

MercuryLiquid

13.530 g/cm³

Olive OilLiquid

0.920 g/cm³

EthanolLiquid

0.789 g/cm³

Pine WoodWood

0.510 g/cm³

Oak WoodWood

0.770 g/cm³

Balsa WoodWood

0.150 g/cm³

Gold (24k)Metal

19.320 g/cm³

SilverMetal

10.490 g/cm³

CopperMetal

8.960 g/cm³

IronMetal

7.870 g/cm³

AluminumMetal

2.700 g/cm³

LeadMetal

11.340 g/cm³

PlatinumMetal

21.450 g/cm³

TitaniumMetal

4.540 g/cm³

ConcreteBuilding

2.400 g/cm³

GlassSolid

2.500 g/cm³

IceSolid

0.917 g/cm³

BrickBuilding

1.850 g/cm³

GraniteBuilding

2.690 g/cm³

RubberPolymer

1.100 g/cm³

CorkSolid

0.240 g/cm³

Carbon FiberPolymer

1.750 g/cm³

PVC PlasticPolymer

1.380 g/cm³

SandSolid

1.600 g/cm³

SoilSolid

1.200 g/cm³

SnowSolid

0.300 g/cm³

👥 Demographics Density

Population

Area (km²)

Demographics Density416.67 ppl/km²

ℹ️ This corresponds to 7.5x higher density than global average.

300x250

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Density Fundamentals

Density represents the volumetric concentration of matter inside substances (ρ = m / V).

By shifting interactive triangle nodes, science engineers solve for:

Density (ρ): Computed as total mass divided by displaced space volume (m / V).
Mass (m): Computed as volumetric load multiplied by physical material density (ρ × V).
Volume (V): Computed as total mass divided by density standard metric (m / ρ).

Common FAQs

How does temperature affect material density?

For most standard materials, heating causes thermal volumetric expansion. Because total mass remains constant, density levels fall as volumes expand.

Why does ice float on liquid water?

Water features unique molecular crystallisation during freezing stages. Molecules rearrange into wide hexagonal lattices, rendering solid ice roughly 9% less dense than surrounding liquid water.

How is population density evaluated?

Demographic population density divides total human occupants by geographic boundaries in square kilometers to evaluate urbanization ratios.

Density: The Triangle of Mass, Volume and ρ

Reference densities worth knowing

ρ = m/V — and a feel for common values catches errors before they ship:

Substance	Density (kg/m³)	Anchor
Water	1,000	The universal reference (1 g/cm³)
Ice	917	Why it floats
Petrol	≈ 740	Lighter than water — fuel floats on it
Aluminium	2,700	Light metal
Steel / iron	≈ 7,850	The default 'heavy'
Gold	19,300	Why fakes are detectable by volume

The unit traps

Density problems fail on units, not concepts: g/cm³ and kg/m³ differ by ×1000 (water is 1 in one, 1000 in the other), liters need converting to m³ (÷1000), and mixing grams with kilograms mid-calculation produces answers off by exactly the factors examiners watch for. Convert everything to one system first — the calculation itself is one division.

Where density questions come from

Float-or-sink predictions (compare to the fluid's density), purity checks (Archimedes and the crown — measured density vs reference), shipping and material estimates (volume known, weight needed), and a steady stream of matric/FSc physics numericals. Unit conversions feeding the formula live in the unit converter, and related rate problems in speed–distance–time.