Mass Calculator

Convert mass units, calculate mass from density, find density from mass, or find volume. Free, fast, and easy to use.

Calculate

Choose a calculation type, enter your values, and click Calculate Now to get instant results with step-by-step solutions.

Complete User Guide

What is Mass?

Mass is a measure of the amount of matter in an object. Unlike weight, which depends on gravity, mass is a constant property. The SI unit for mass is the kilogram (kg). Mass is fundamental to physics, chemistry, engineering, cooking, shipping, and everyday life.

Formulas

Mass: m = ρ × V

Density: ρ = m / V

Volume: V = m / ρ

4 Calculation Types

Convert Mass Units

Convert between kg, g, mg, lb, oz, tons, stone, and US tons.

Mass from Density & Volume

m = ρ × V. Know the density and volume? Find the mass.

Density from Mass & Volume

ρ = m / V. Know mass and volume? Find the density.

Volume from Mass & Density

V = m / ρ. Know mass and density? Find the volume.

Common Conversions

• 1 kg = 2.20462 lb

• 1 lb = 453.592 g

• 1 kg = 35.274 oz

• 1 stone = 6.35029 kg = 14 lb

• 1 metric ton = 1,000 kg

• 1 US ton = 907.185 kg = 2,000 lb

Supported Units

Mass

  • kg, g, mg
  • lb, oz, stone
  • Metric tons, US tons

Volume

  • m³, cm³
  • L, mL
  • ft³, in³, US gal

Density

  • kg/m³, g/cm³
  • g/mL
  • lb/ft³, lb/in³

Important Notes

  • Mass is always non-negative. Density and volume must be > 0.
  • Mass ≠ Weight. Weight depends on gravity; mass is constant.
  • All calculations convert to SI base units internally (kg, m³, kg/m³).

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