Density Converter Calculator

About the Density Converter Calculator

The density converter accepts a value in any of 10 density units — kg/m³, g/cm³, g/mL, kg/L, lb/ft³, lb/in³, lb/gal, oz/in³, kg/cm³, and t/m³ — and converts to every other unit plus specific gravity.

Preset buttons load densities of common materials: water, steel, aluminum, gold, gasoline, mercury, and more. A floatation indicator tells you whether the material sinks or floats in water, and a visual bar shows the specific gravity relative to osmium (densest stable element).

The reference table lists 20 materials from air to osmium with densities in three systems so you can locate nearby materials. Rows close to your current value are highlighted for quick comparison. This supports faster material screening and sanity checks in lab, manufacturing, and field estimation workflows. It is especially helpful when source data mixes imperial values from vendor sheets with SI values required in engineering calculations and compliance reports for design approval packages.

When This Page Helps

Engineers, chemists, and hobbyists specify density in different systems (SI vs. Imperial vs. specific gravity). This calculator bridges all of them and includes a material lookup table for quick reference, reducing conversion mistakes during reporting and design work across international teams, suppliers, and compliance workflows in fast-paced project environments and production schedules.

How to Use the Inputs

1. Enter a density value.
2. Select the input unit (e.g., kg/m³).
3. Select the target output unit.
4. Read the converted value plus all other units.
5. Click a material preset for common densities.
6. Compare against the 20-material reference table.

Example Calculation

Tips & Best Practices

• g/cm³, g/mL, and kg/L are numerically identical — just different notations.
• Specific gravity is dimensionless: it is the ratio of the material density to water density.
• A material floats if its density is less than the fluid it is placed in.
• Mercury (13,534 kg/m³) is dense enough for iron (7,800 kg/m³) to float on it.
• Air at sea level has density ~1.225 kg/m³ — about 800× less than water.
• Osmium at 22,590 kg/m³ is the densest naturally occurring element.

Density in Engineering

Structural engineers select materials by density and strength. Aluminum (2,700 kg/m³) has about one-third the density of steel (7,800 kg/m³), which is why aircraft frames use aluminum alloys. Titanium (4,540 kg/m³) offers a middle ground with superior strength-to-weight ratio.

Density and Buoyancy

Archimedes' principle: a floating object displaces a weight of fluid equal to its own weight. A ship made of steel (SG 7.8) floats because its hull encloses a large volume of air, giving the overall ship an average density less than water.

Liquid Density and Temperature

Density of liquids varies with temperature. Water reaches maximum density at 3.98 °C (999.97 kg/m³). Heating water from 4 °C to 100 °C reduces its density to about 958 kg/m³ — a 4% decrease that drives convection currents.

Frequently Asked Questions

• What is density?

  Density is mass per unit volume (ρ = m/V). SI unit is kg/m³. Denser objects pack more mass into the same volume.

• What is specific gravity?

  Specific gravity (SG) is the ratio of a substance's density to water at 4 °C (1000 kg/m³). SG < 1 means it floats; SG > 1 means it sinks.

• How do I convert g/cm³ to kg/m³?

  Multiply by 1000. 1 g/cm³ = 1000 kg/m³.

• What is the difference between density and specific gravity?

  Density has units (kg/m³). Specific gravity is a dimensionless ratio relative to water. Numerically SG equals density in g/cm³.

• Why does ice float on water?

  Ice has density ~917 kg/m³ (SG 0.917), less than liquid water at 1000 kg/m³. Water expands when it freezes — a unique property among common substances.

• How do I convert lb/ft³ to kg/m³?

  Multiply by 16.01846. Example: 100 lb/ft³ × 16.018 = 1,601.8 kg/m³.