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Mass is a measure of matter in an object. Common units: 1 kg = 1000 g = 2.20462 lbs. Weight depends on gravity; mass does not. In everyday use, weight and mass are often used interchangeably.
Review the inputs carefully and treat the output as an estimate. For decisions involving money, taxes, health, law, or security, compare the result with trusted professional guidance when needed.
What is the difference between mass and weight?
Mass is the amount of matter (constant everywhere). Weight is the gravitational force on that mass (varies by location). On Earth, 1 kg weighs ~9.81 N.
Weight Calculator
Convert weight or body weight between pounds, kilograms, stones, and other common units.
Open toolDensity Calculator
Calculate density (ρ = m/V), mass, or volume when any two of the three values are known.
Open toolConversion Calculator
Convert between common measurement units including length, temperature, area, and volume.
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