LifeTally
Mixture mass percentage calculator
What is the final mass percentage of one constituent in two measured masses?
Combine two masses and their mass percentages; see the constituent contributions and final percentage.
Two measured parts
Use grams for both masses and mass percentages of the same constituent. Fractions and zeros are allowed; volume percentages cannot be substituted.
How the estimate works
Each contribution equals its part's mass multiplied by its mass percentage divided by 100. Add the two masses and the two contributions separately. For positive total mass, divide total constituent mass by total mass and multiply by 100. This is our two-part model with no loss or change of constituent.
M = mA + mB
a = mA × pA ÷ 100; b = mB × pB ÷ 100
Q = a + b; M > 0: p = 100Q ÷ MBoth percentages must describe the same constituent on the same mass basis. This arithmetic excludes reactions, losses, evaporation and separation. It does not convert volume or density, assess solubility or compatibility, or provide physical mixing instructions, recipes, doses, chemical, medical or food safety advice. Actual composition is not guaranteed; use appropriate measurements and material requirements.
OpenStax: definition of mass percentage ↗Check the filled example
Chosen example: 100 g at 10% and 300 g at 30% contain 10 g and 90 g of the constituent. Total: 400 g, including 100 g of constituent; 100 ÷ 400 × 100 = 25%. These are example inputs, not a recipe or recommended composition.
Accepted input values
- Mass of part A (g)
- 100
- Constituent in A (% by mass)
- 10
- Mass of part B (g)
- 300
- Constituent in B (% by mass)
- 30
Plan the next step
Convert measured masses to the same unit first. Then check that both supplied percentages are by mass.
Unit converter →