PPM ⇄ Molarity Calculator
Convert between concentration (ppm/ppb) and molarity using molar mass.
Inputs
Step-by-step derivation
Assumption (dilute aqueous): 1 ppm ≈ 1 mg/L, 1 ppb ≈ 0.001 mg/L.
1)
c (mg/L) = ppm (or ppb / 1000)2)
M (mol/L) = c (mg/L) / [1000 × Mw (g/mol)]Inverse:
ppm (mg/L) = M × Mw × 1000 (then ×1000 for ppb)References
- For dilute aqueous solutions, 1 ppm ≈ 1 mg/L; 1 ppb ≈ 0.001 mg/L.
M = c/(1000·Mw)withcin mg/L andMwin g/mol.- Inverse:
c = M·Mw·1000(mg/L) ⇒ ppm; ppb = ppm×1000.