Free Density Calculator — Find Density, Mass or Volume Using ρ = m ÷ V

Calculate density from mass and volume, find mass from density and volume, or find volume from mass and density.

Density Calculator

Mass (kg)

Volume (m³)

How to Use

Choose the mode based on what you want to find. Find Density: enter mass (kg) and volume (m³) to get density in kg/m³. Find Mass: enter density and volume to get mass in kg. Find Volume: enter mass and density to get volume in m³. All values use SI units (kg and m³). For other units, convert first using the Mass & Weight converter.

Worked Examples

Water

Mass1 kg

Volume0.001 m³

Density = 1,000 kg/m³

Aluminium

Density2,700 kg/m³

Volume0.01 m³

Mass = 27 kg

Iron block

Mass158 kg

Density7,874 kg/m³

Volume = 0.02 m³

ℹ️ Accuracy Disclaimer

Results from this calculator are estimates based on the physical density formula (ρ = mass ÷ volume) and are provided for general informational purposes. Rounding, regional standards and manufacturer variations can cause small differences from official or brand-specific figures.

For decisions where precision is critical — engineering, construction or legal contexts — verify results with a qualified professional or an official reference source.

🛡️ Formula Verification & Methodology

This calculator uses the physical density formula (ρ = mass ÷ volume). The underlying logic was built and manually cross-checked against independent reference calculators and textbook worked examples across dozens of test cases before publication.

Every formula on elCalculador is reviewed by our editorial team for mathematical accuracy, and pages are re-audited whenever a calculator's logic or inputs are updated.

Methodology last reviewed: September 2026 · Read our full Editorial Methodology · Spotted an error? Let us know.

Frequently Asked Questions

Density is mass per unit volume: ρ = m ÷ V. It tells you how much matter is packed into a given space. Water has a density of 1,000 kg/m³; iron is about 7,874 kg/m³; air is approximately 1.225 kg/m³.

ρ (density) = m (mass) ÷ V (volume). Rearranged: m = ρ × V, and V = m ÷ ρ. This triangle — ρ = m/V — is one of the most fundamental formulas in physics and chemistry.

Pure water at 4°C has a density of exactly 1,000 kg/m³ (1 g/cm³ or 1 kg/litre). This is the reference point for specific gravity: materials denser than 1,000 kg/m³ sink in water; less dense materials float.

Multiply by 1,000. A density of 1 g/cm³ = 1,000 kg/m³. This is because 1 m³ = 1,000,000 cm³ and 1 kg = 1,000 g, giving a conversion factor of 1,000.