Density Converter Online — Convert kg/m³, g/cm³, g/mL and Other Units

Instant density unit conversion: kg/m³, g/cm³, g/mL, kg/L, t/m³, lb/ft³ and more. Material density reference table included

Density Conversion
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Ratio: 1 g/cm³ = 1,000 kg/m³ = 1 kg/L = 1 t/m³ = 62.43 lb/ft³
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Material Density Table
Water (4 °C) — 1,000 kg/m³

The density standard. At 4 °C water reaches its maximum density of exactly 1 g/cm³. Used as the reference substance for specific gravity

Air (20 °C) — 1.204 kg/m³

Density of air at sea level, 20 °C and standard pressure. Decreases with altitude and increasing temperature

Iron / Steel — 7,874 kg/m³

Pure iron — 7,874 kg/m³. Structural steel — 7,750–8,050 kg/m³ depending on composition and grade

Aluminium — 2,700 kg/m³

Lightweight structural metal. Nearly three times lighter than steel. Widely used in aerospace, construction and automotive industries

Copper — 8,960 kg/m³

Heavy non-ferrous metal. Used in electrical engineering due to its high electrical conductivity

Gold — 19,320 kg/m³

One of the densest metals. A cube of gold with 10 cm sides weighs 19.3 kg

Mercury — 13,546 kg/m³

The only metal that is liquid at room temperature. Used in thermometers and barometers

Concrete — 2,400 kg/m³

Reinforced concrete — 2,500 kg/m³. Lightweight concrete — 1,200–1,800 kg/m³. Varies by aggregate and grade

Wood (Oak) — 750 kg/m³

Pine — 500 kg/m³, birch — 650 kg/m³, oak — 750 kg/m³, ebony — up to 1,200 kg/m³

Petrol / Gasoline — 750 kg/m³

Gasoline density is 720–780 kg/m³ depending on grade. Lighter than water — it floats on the surface

Milk — 1,030 kg/m³

Slightly denser than water. Used in the food industry for quality control

Honey — 1,420 kg/m³

Significantly denser than water. Density depends on moisture content and variety: 1,380–1,450 kg/m³

Ethanol — 789 kg/m³

Pure ethanol (96%). Lighter than water. Used to determine the strength of alcoholic beverages

Ice (0 °C) — 917 kg/m³

Ice is about 8% lighter than water, which is why it floats. An anomalous property — most solids are denser than their liquid form

Density Units Explained
kg/m³

The SI standard unit of density. Kilogram per cubic metre. For example, water is 1,000 kg/m³, iron is 7,874 kg/m³. Convenient for engineering and industrial calculations

g/cm³

The most popular unit in chemistry and physics. 1 g/cm³ = 1,000 kg/m³. Water = 1 g/cm³ — a convenient reference. Numerically identical to g/mL, kg/L and t/m³

g/mL

Identical to g/cm³ (1 mL = 1 cm³). Used primarily in medicine, pharmacology and laboratory practice

kg/L

Identical to g/cm³ and t/m³. Convenient for everyday calculations: 1 litre of water weighs 1 kg

t/m³

Tonne per cubic metre. Identical to g/cm³ and kg/L. Used in construction, mining and metallurgy

lb/ft³

Pound per cubic foot. The primary density unit in the US and UK. 1 lb/ft³ ≈ 16.02 kg/m³. Water ≈ 62.43 lb/ft³

Frequently Asked Questions About Density
How do I convert kg/m³ to g/cm³?

Divide the value by 1,000. For example: water 1,000 kg/m³ = 1 g/cm³. Iron 7,874 kg/m³ = 7.874 g/cm³. Formula: g/cm³ = kg/m³ ÷ 1,000.

Why are g/cm³, g/mL and kg/L the same?

1 millilitre = 1 cubic centimetre (by definition). Therefore 1 g/mL = 1 g/cm³. And 1 kg/L = 1,000 g / 1,000 mL = 1 g/mL. Also 1 t/m³ = 1,000 kg / 1 m³ = 1 kg/L. All four units give the same numerical value.

What is the density of water?

At 4 °C (maximum density): 1,000 kg/m³ = 1 g/cm³ = 62.43 lb/ft³. At 20 °C: ~998 kg/m³. At 100 °C (boiling): ~958 kg/m³. Water is the reference substance for determining specific gravity.

What is the density of iron and steel?

Pure iron — 7,874 kg/m³ (7.874 g/cm³). Structural steel — 7,750–8,050 kg/m³ depending on grade. Stainless steel — up to 8,000 kg/m³. Cast iron — 6,800–7,300 kg/m³.

How do I convert lb/ft³ to kg/m³?

Multiply the value by 16.0185. For example: 62.43 lb/ft³ × 16.0185 ≈ 1,000 kg/m³ (water). Reverse: kg/m³ ÷ 16.0185 = lb/ft³.

What is the difference between density and specific gravity?

Density is an absolute property (mass per unit volume, kg/m³). Specific gravity is a relative quantity (the ratio of a substance's density to the density of water). Specific gravity is dimensionless: for iron ≈ 7.87 (i.e. 7.87 times denser than water).

What affects the density of a substance?

Temperature (heating decreases density), pressure (compression increases it), state of matter (solid > liquid > gas, except water/ice) and chemical composition. For gases, density depends strongly on pressure; for liquids and solids, mainly on temperature.

What is the density of aluminium and gold?

Aluminium — 2,700 kg/m³ (2.7 g/cm³), nearly three times lighter than steel. Gold — 19,320 kg/m³ (19.32 g/cm³), one of the densest metals. A 10×10×10 cm cube of gold weighs 19.3 kg.

Density Converter — How to Convert Density Units

Density is a physical property that describes mass per unit volume. It is denoted by the Greek letter ρ (rho). Formula: ρ = m / V, where m is mass and V is volume. The SI unit is kilogram per cubic metre (kg/m³). Our density converter allows instant conversion between 11 different units.

kg/m³ and g/cm³ — the Primary Units

Kilogram per cubic metre (kg/m³) is the SI standard. Gram per cubic centimetre (g/cm³) is the most practical unit because water has a density of exactly 1 g/cm³. The conversion is straightforward: g/cm³ = kg/m³ ÷ 1,000. The units g/mL, kg/L and t/m³ all give the same numerical value as g/cm³.

Common Material Densities

Water (4 °C) — 1,000 kg/m³, the reference standard. Air — just 1.2 kg/m³. Aluminium — 2,700 kg/m³ (a lightweight metal). Iron and steel — 7,800–7,900 kg/m³. Gold — 19,320 kg/m³. Mercury — 13,546 kg/m³ (the only metal that is liquid at room temperature). Gasoline — 750 kg/m³ (floats on water). Ice — 917 kg/m³ (lighter than water, which is why it floats).

Imperial Density Units

In the US and UK, density is commonly expressed as lb/ft³ (pound per cubic foot) and lb/in³ (pound per cubic inch). Water ≈ 62.43 lb/ft³. Also common is lb/gal — pound per gallon, noting that the US and UK gallons differ: US gallon = 3.785 L, UK gallon = 4.546 L.

Practical Applications

Knowing density is essential for calculating material mass in construction (concrete, steel), determining fuel quality (gasoline, diesel), dairy product quality control, pharmaceutical calculations (mg/mL), and determining buoyancy (comparing with the density of water).

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