Mass Percent Calculator
Calculate the mass percentage of a component in a mixture or compound.
About Mass Percent Calculator
Mass percent is the most common way to express concentration in industry because it needs no density or molar mass data. For dilute aqueous solutions, one mass per cent is about 10 g/L. Trace concentrations are quoted in ppm precisely because mass percent becomes unwieldy below about 0.01 per cent.
Formula
Mass Percent
Mass % = component mass ÷ total mass × 100
- ppm
- Parts per million, the same ratio scaled by a million
Worked example
With the default values below, Mass Percent Calculator returns Mass Percent of 10.0000%. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Mass of the componentminimum 0 g
- 25 g
- Total mass of the mixtureminimum 0 g
- 250 g
Results
- Mass Percent
- 10.0000%
- Concentration
- 100,000.00 ppm
- Mass of Everything Else
- 225.0000 g
- Mass Ratio of Component to Remainder
- 0.111111
- Equivalent Concentration if Water
- 100.0000 g/L
Step by step
- 1Values used
- 2Mass Percent
- 3Mass Percent= 10.0000
- 4Concentration= 100,000.00 ppm
- 5Mass of Everything Else= 225.0000 g
- 6Mass Ratio of Component to Remainder= 0.111111
- 7Equivalent Concentration if Water= 100.0000 g/L
Assumptions and limits
- The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 6 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is Mass Percent calculated?
Mass % = component mass ÷ total mass × 100 Mass percent is the most common way to express concentration in industry because it needs no density or molar mass data. For dilute aqueous solutions, one mass per cent is about 10 g/L.
Why does Mass Percent matter?
Trace concentrations are quoted in ppm precisely because mass percent becomes unwieldy below about 0.01 per cent.
What values do I need to enter?
This calculator takes 2 inputs: Mass of the component, Total mass of the mixture. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.