Mass Calculator
Calculate mass, density, or volume using the standard physics formula m = ρV. Includes built-in densities for common materials like steel, gold, and water.
Selecting a material will auto-fill the Density field.
Mass Formula
The relationship between mass, density, and volume is one of the fundamental equations in physics and engineering.
- Mass (m): The amount of matter in an object. Common units: kg, lb, g.
- Density (ρ - rho): How much mass is contained per unit of volume. Common units: kg/m³, g/cm³.
- Volume (V): The amount of 3D space an object occupies. Common units: m³, L, gal.
Material Densities
Knowing the density of materials helps you estimate weight without a scale. For example, if you know the volume of a steel beam, you can multiply it by the density of steel (approx 7850 kg/m³) to find its weight.
- Water: 1,000 kg/m³ (1 g/cm³)
- Concrete: ~2,400 kg/m³
- Gold: 19,300 kg/m³
- Air: ~1.2 kg/m³ (at sea level)
? Frequently Asked Questions
Technically, no. Mass is the amount of matter in an object, while weight is the force of gravity acting on that mass. However, on Earth, we often use the terms interchangeably in everyday contexts (like kg and lbs).
Water has a density of exactly 1 kg per liter (or 1 g per ml). So if you have 5 liters of water, it has a mass of 5 kg.
The standard SI unit is kg/m³. However, g/cm³ is commonly used in chemistry, and lb/ft³ is common in US construction.