Mass Calculator

Mass comes up in chemistry, physics, shipping, cooking, and everyday life. Whether you need to convert between units or calculate mass from density and volume, this calculator handles it all in one place.

What Is Mass?

Mass is the measure of the amount of matter in an object. Unlike weight, mass doesn't change based on gravity — a 70 kg person has the same mass on Earth and on the Moon, even though they'd weigh much less on the Moon.

How to Use This Calculator

1. To convert mass: enter a value, select the input unit and output unit, and get the result instantly.
2. To calculate mass from density and volume: enter density and volume values and click Calculate.

Mass Formula

m = ρ × V

• m = Mass
• ρ = Density
• V = Volume

Common Mass Conversions

• 1 kilogram (kg) = 2.20462 pounds (lb)
• 1 pound (lb) = 453.592 grams (g)
• 1 ounce (oz) = 28.3495 grams
• 1 tonne (metric ton) = 1,000 kg = 2,204.62 lb
• 1 stone (UK) = 14 pounds = 6.35 kg

Example Calculation

Convert 85 kg to pounds:

• 85 × 2.20462 = 187.39 lb

Calculate mass of a copper block: density = 8.96 g/cm³, volume = 50 cm³:

• m = 8.96 × 50 = 448 grams

Why Use This Calculator?

Mass conversion is needed in science labs, shipping and logistics, cooking with international recipes, and health tracking. This calculator handles all common units and the physics formula in one tool.

Common Mistakes to Avoid

• Confusing mass and weight — weight is mass × gravitational acceleration (W = m × g). Mass is the same everywhere; weight varies with gravity.
• Using weight when mass is required — in chemistry, you always use mass (grams, kilograms) in calculations, not weight in Newtons.
• Mixing metric and imperial units — convert everything to the same system before calculating.

Frequently Asked Questions

Is mass the same as weight?

No. Mass is the amount of matter; weight is the force exerted on that matter by gravity. On Earth, a 1 kg mass weighs about 9.81 Newtons.

What unit of mass is used in science?

The SI unit of mass is the kilogram (kg). In chemistry, grams (g) and milligrams (mg) are also commonly used.

How do I weigh something in grams without a scale?

You can estimate by comparison — a US penny weighs 2.5 g, a teaspoon of water ≈ 5 g, a nickel ≈ 5 g.

What is atomic mass?

Atomic mass (or atomic weight) is the average mass of an atom of an element, measured in atomic mass units (amu or u). It appears on the periodic table for each element.

How many grams in a pound?

There are 453.592 grams in one pound.

Conclusion

Mass is a fundamental concept in science and daily life. Whether you're converting units for a recipe, a lab report, or a shipping calculation, this mass calculator gets you the answer quickly and accurately.

Related: Density Calculator | Weight Calculator | Conversion Calculator