Mass Calculator
Calculate mass using density and volume or force and acceleration
Density of the material
Volume of the object
Mass
2204.62 lb
Weight on Earth
2203.13 lbf
Weight on Different Celestial Bodies
How it works
A mass calculator converts between units of mass and relates mass to force and density. Mass measures the amount of matter; weight is the force gravity exerts on it (weight = mass × g). Density links mass and volume.
Mass relationships
Weight = mass × g Mass = density × volume
- g
- gravity ≈ 9.81 m/s² on Earth
- density
- mass per unit volume
Worked example
- Volume = 0.5 m³
- Density = 1,000 kg/m³ (water)
- Mass = 1,000 × 0.5
500 kg of mass.
Good to know
- Mass is constant everywhere; weight changes with gravity (you'd weigh less on the Moon, same mass).
- Kilograms measure mass; newtons measure weight (force).
- Keep density and volume units consistent before multiplying.
Related Calculators
Frequently Asked Questions
How do I calculate mass from density and volume?
Mass = density × volume (m = ρV). For example, 2 liters of water at 1,000 kg/m³ has a mass of 0.002 m³ × 1,000 = 2 kg. Make sure density and volume use consistent units before multiplying.
What's the difference between mass and weight?
Mass is the amount of matter in an object and never changes; weight is the gravitational force on that mass (W = mg) and depends on where you are. A 70 kg astronaut has the same mass everywhere but weighs far less on the Moon.
How much would I weigh on another planet?
Multiply your Earth weight by the body's relative surface gravity: about 0.165 on the Moon, 0.38 on Mars, and 2.34 on Jupiter (at its cloud tops). A 150 lb person would weigh about 25 lb on the Moon and 57 lb on Mars.
How do I find mass from force and acceleration?
Use Newton's second law rearranged: m = F ÷ a. If a 50 N net force accelerates an object at 2 m/s², its mass is 25 kg. Force must be the net force in newtons and acceleration in m/s² for the answer in kilograms.
What units are used for mass?
The SI unit is the kilogram (kg), with grams and metric tons for smaller and larger amounts. The imperial pound is technically a unit of force, but pounds-mass (lbm) are used in everyday contexts; 1 kg ≈ 2.205 lb on Earth.