Chemistry
Mass Percent Calculator
Find what share of a mixture's mass comes from one component.
Your inputs
Change any value to update the result instantly.
Mass percent
12.5 % w/w
Mass of everything else
175 g
Remaining percentage
87.5 %
Parts per million equivalent
1,25,000 ppm
Total mass means solute plus solvent, not solvent alone.
What this calculator does
Calculates the percentage of a mixture's total mass contributed by one component.
What your result means
A mass percent of 12.5 means 12.5 grams of that component in every 100 grams of mixture.
Formula and working
% w/w = (m_component ÷ m_total) × 100
- 1
Collect the inputs
Mass of the component (m_component) = 25 g; Total mass of the mixture (m_total) = 200 g
- 2
Apply the formula
% w/w = (m_component ÷ m_total) × 100
- 3
Result
Mass percent = 12.5 % w/w
Frequently asked questions
Symbols and assumptions
- m_component
- Mass of the component
- m_total
- Total mass of the mixture
- • Total mass includes solute plus solvent, or every component of the mixture.
Sources and review
Reviewed 2026-09-22 · Next review 2027-09-22
- • Mass percent is not interchangeable with volume percent or molarity without density and molar mass.
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
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