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Chemistry

Mass Percent Calculator

Calculate the mass percentage of a solute using solute mass and total solution mass.

Explicit units and model assumptionsLocal calculations with worked examples
Chemistry workspace
Chemistry workspace

Check the units, concentration basis and assumptions before interpreting the result.

See the method

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Your chemistry result

Your result

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Use the Calculate button to see your result.

Review the method below for assumptions and conventions.

How to use this tool

  1. Enter solute mass, total solution mass.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

The method, explained

Mass percent (w/w) = solute mass ÷ total solution mass × 100.

A WORKED EXAMPLE

Using solute mass = 10 g, total solution mass = 200 g, the result is 5 % w/w. Change these example inputs to match your task; use the method above to check each step.

Understanding your result

Yes. If you have 10 g solute and 190 g solvent, enter 200 g total solution to obtain 5% w/w.

What to keep in mind

This is mass/mass concentration, not mass/volume or volume/volume percent. Educational calculation only; use validated procedures for laboratory work.

Reference: OpenStax Chemistry 2e — chemical quantities and models

Common questions

Does solution mass include the solute?

Yes. If you have 10 g solute and 190 g solvent, enter 200 g total solution to obtain 5% w/w.

Are my inputs uploaded?

No. This calculation runs in your browser without an account or an external API.

Methodology maintained by ClarityKit. How these tools are built and checked.