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Solutions · Concentration

Solution Mass Percent Calculator

Calculate solute mass percentage from solute mass and total solution mass.

Formula shown Runs locally Reviewed Aug 11, 2026
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Equation guide

Solute and total solution masses in the same unit

Mass concentration

mass % = msolute/msolution × 100

Solution mass

msolution = msolute + msolvent
Solution calculator

Mass percentage of solute

Use the same mass unit for both values. Solute mass cannot exceed total solution mass.

m/m %

The mass percentage will appear here.

Using the model

Symbols, assumptions and limitations

Interpretation notes

Both masses must use the same unit. Total solution mass must be positive and includes solute plus solvent; zero solute is valid and gives 0% by mass.

Worked examples

See the method in practice

01

Five-percent solution

5 g solute in 100 g solution is 5% by mass.

02

Solvent versus solution

5 g solute plus 95 g solvent gives 100 g solution.

Questions

Frequently asked

Is mass percent the same as molarity?

No. Mass percent is a mass ratio; molarity is moles of solute per litre of solution.

Can the two masses use different units?

Convert them to the same mass unit before dividing.

Sources & review

Equations and examples are checked against the references below. Results are educational and should be independently verified for safety-critical work.

OpenStax Chemistry — concentration

Written by the STEM Hub editorial team · Reviewed August 11, 2026 · Review methodology