Parts per million calculator
Fill in what you know and leave the unknown box empty — it works out whichever one is missing. Nothing is uploaded; the arithmetic happens in your browser.
The formula
ppm = (solute ÷ solution) × 10⁶
Where this usually goes wrong
Both masses in the same unit. For dilute water samples 1 ppm is about 1 mg per litre.
Worked example
5 mg in 1 kg of water is 5 ppm.
Those numbers are already in the boxes above — press Work it out to see it, then change them for your own.
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