PPM Calculator

Convert between parts per million, percent, parts per billion and mg/L, or find ppm from the mass of a solute in a volume of water. Example: 5 mg in 2 liters of water is 2.5 ppm, and 1,000 ppm is 0.1%.

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Calculate

Solute mass (mode 1)

Water volume (mode 1)

liters

ppm value (mode 2)

ppm

How to use the PPM Calculator

Choose whether to find ppm from a mass and volume or to convert a ppm value.
Fill in the matching fields.
Press Calculate for ppm, percent, ppb and mg/L.

Formula and method

ppm = mg of solute / liters of solution for dilute water. Percent = ppm / 10,000. ppb = ppm x 1,000. 1 ppm = 1 mg/L.

Worked example: 5 mg in 2 liters

Step	Result
ppm (5 / 2)	2.5
Percent (2.5 / 10,000)	0.00025%
ppb	2,500

ppm conversion chart

ppm	Percent	ppb
1	0.0001%	1,000
10	0.001%	10,000
100	0.01%	100,000
1,000	0.1%	1,000,000
10,000	1%	10,000,000

Where ppm is used

ppm describes chlorine in pools, nutrients in hydroponics, dissolved solids in drinking water and contaminants in air or soil. The EPA limits many drinking water contaminants in ppm or ppb.

Frequently asked questions

What does ppm mean?

Parts per million: one part in a million parts.

How do I convert ppm to percent?

Divide by 10,000.

Is ppm the same as mg/L?

For dilute water solutions, yes.

How do I convert ppm to ppb?

Multiply by 1,000.

How many ppm is 1%?

10,000 ppm.

What ppm is safe in drinking water?

It depends on the contaminant. See EPA limits.

Sources

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