Mass Percent Calculator Formula
Understand the math behind the mass percent calculator. Each variable explained with a worked example.
Formulas Used
Mass Percent
mass_percent = (mass_solute / mass_solution) * 100Mass of Solvent
mass_solvent = mass_solution - mass_soluteVariables
| Variable | Description | Default |
|---|---|---|
mass_solute | Mass of Solute(g) | 10 |
mass_solution | Mass of Solution(g) | 100 |
How It Works
How to Calculate Mass Percent
Formula
Mass % = (mass of solute / mass of solution) × 100
Mass percent tells you the grams of solute per 100 grams of solution.
Worked Example
10 g of salt dissolved in 90 g of water (100 g solution).
mass_solute = 10mass_solution = 100
- 01Mass % = (10 / 100) × 100
- 02Mass % = 10%
Frequently Asked Questions
What is mass percent?
Mass percent (w/w%) is the ratio of solute mass to total solution mass, multiplied by 100.
How is it different from volume percent?
Mass percent uses masses; volume percent uses volumes. Mass percent is temperature-independent.
Is mass percent the same as purity?
Often yes. Purity of a substance is commonly expressed as mass percent of the desired component.
Ready to run the numbers?
Open Mass Percent Calculator