PPM Calculator

Published August 19, 2026

PPM Calculator

Calculate parts per million for laboratory and pharmaceutical applications

Mass to PPM

Calculate ppm when the mass of solute and total solution/sample mass are known.

Mass of Solute

Total Sample / Solution Mass

Calculated Concentration

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Formula:
PPM = (Mass of solute ÷ Total sample mass) × 1,000,000

Calculation:

Mass / Volume PPM

For dilute aqueous solutions, 1 ppm is approximately equal to 1 mg/L.

Mass of Solute

Solution Volume

Concentration

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Formula:
PPM ≈ mg/L

Calculation:

PPM Dilution Calculator

Calculate the volume of stock solution required to prepare a desired PPM concentration.

Stock Concentration

PPM

Desired Concentration

PPM

Final Volume

Stock Solution Required

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Formula:
C₁V₁ = C₂V₂

Calculation:

1 ppm 1 part of substance per 1,000,000 parts of solution.

Water Solutions For dilute aqueous solutions, 1 ppm ≈ 1 mg/L.

Percentage 1% = 10,000 ppm.

Important: The mg/L ≈ ppm relationship assumes a dilute aqueous solution with a density close to 1 kg/L. For non-aqueous or concentrated solutions, use the appropriate mass-based ppm calculation.