Updated Physics & Chemistry

Mass Calculator

Calculate mass from density and volume, weight and gravity, or force and acceleration, convert between mass units, find molar mass from a chemical formula and compute mass percent in mixtures.

m = ρ × V m = W ÷ g m = F ÷ a Molar Mass & Percent

All-in-One Mass, Gravity And Molar Mass Suite

Switch between density-based mass, gravity and force-based mass, a mass unit converter, a molar mass calculator and a mass percent tool in one consistent layout.

Enter density and volume to calculate mass in kilograms, grams, pounds and ounces. Ideal for material and volume-based planning.

Convert weight (force) to mass using gravitational acceleration. Useful for comparing weights on Earth, Moon or other planets.

Apply Newton’s second law, m = F ÷ a, to find mass from a known force and acceleration. Choose between Newtons and pound-force.

Use actual acceleration, not gravity unless you are modeling weight.

Convert a mass value between kilograms, grams, milligrams, metric tons, pounds, ounces and slugs.

Enter a chemical formula to calculate molar mass in g/mol. Optionally add moles to get total mass of the sample.

Use standard notation. Parentheses are supported, e.g., Ca(OH)2.

Calculate mass percent of a component in a mixture or solution. You can also see the remaining mass.

All masses should use the same unit.

Mass Calculator – Density, Gravity, Force And Molar Mass

This mass calculator brings together practical tools from physics and chemistry in one place. You can compute mass from density and volume, from weight and gravity, or from force and acceleration, convert between common mass units, estimate molar mass from a chemical formula and find mass percent in mixtures or solutions.

Core Mass Relationships

Several fundamental formulas sit behind the different tabs:

  • From density and volume: m = ρ × V
  • From weight and gravity: m = W ÷ g
  • From force and acceleration: m = F ÷ a
  • Mass percent: mass % = (component mass ÷ total mass) × 100

The calculator uses kilograms internally for mass and cubic metres for volume, then converts to grams, pounds, ounces, slugs and more so that you can match lab notes, datasheets and engineering drawings.

Using Density, Gravity And Force Tabs

The density-based tab is ideal when you know the material and the space it occupies, such as a tank of liquid or a metal bar. The gravity-based tab is useful when you have a scale reading or force gauge and want to find the underlying mass, either on Earth or another body like the Moon or Mars. The force and acceleration tab applies Newton’s second law directly for dynamics problems.

Molar Mass And Mass Percent In Chemistry

The molar mass tab parses a chemical formula to estimate the mass of one mole of that substance in g/mol. Once you know the molar mass, multiplying by the number of moles gives the mass of your sample. The mass percent tab highlights how much of a sample is made up by one component, which is useful when preparing mixtures or checking composition.

Mass Calculator

Frequently Asked Questions

Clear explanations about mass, weight, molar mass accuracy, and how to handle mixed units safely.

Mass measures the amount of matter in an object and does not change when you move between planets. Weight is the force of gravity acting on that mass, so it varies when gravitational acceleration changes. The gravity-based tab lets you convert between mass and weight based on the local gravitational field.

Kilograms are the SI base unit for mass. Slugs are an imperial unit used when force is measured in pound-force and distance in feet. Showing both units helps when working with older textbooks, engineering references or mixed-unit mechanics problems.

The molar mass tool uses standard atomic weights and counts atoms exactly based on the chemical formula you enter. It is fully accurate for education and most laboratory planning. For extremely high-precision chemistry, use updated reference tables specific to your discipline.

No. The mass percent tab assumes all masses are expressed in the same unit. If your values come from different unit systems, convert them first using the unit converter tab. That way, the percentages correctly represent the real ratios between the components.