Treat ppm, ppb, and mg/L as the same dilute-solution scale when a water report mixes them.
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Use this for drinking-water notes and lab sheets where 1 ppm is taken as 1 mg/L in water. Type the concentration, pick the unit on the report, then pick the unit you want.
Conversion is linear: 1 ppm = 1 mg/L = 1000 ppb in this tool. That mg/L ≈ ppm jump holds for dilute water, not for dense solvents or air in mg/m³.
Value: The concentration number from the report.
From: ppm, ppb, or mg/L — whichever the report used.
To: The unit you want to read it in.
Result: The same concentration in the To unit.
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