Concentration Converter

Convert mass concentration between mg/L, g/L, ppm, ppb, mg/dL, percent (w/v) and other units used in labs and water testing.

How to use the Concentration Converter

  1. Type the value you want to convert in the first box.
  2. Choose the unit you are converting from and the unit you want to convert to.
  3. Read the result instantly. Use the swap button to reverse the direction, or copy the result with one click.

Popular concentration conversions

ConversionResultFormula
Milligrams per liter to parts per million1 mg/L = 1 ppmparts per million = milligrams per liter × 1
Parts per million to milligrams per liter1 ppm = 1 mg/Lmilligrams per liter = parts per million × 1
Parts per million to percent (w/v)1 ppm = 0.0001 % w/vpercent (w/v) = parts per million ÷ 10,000
Percent (w/v) to parts per million1 % w/v = 10,000 ppmparts per million = percent (w/v) × 10,000
Grams per liter to milligrams per milliliter1 g/L = 1 mg/mLmilligrams per milliliter = grams per liter × 1
Milligrams per milliliter to grams per liter1 mg/mL = 1 g/Lgrams per liter = milligrams per milliliter × 1
Parts per billion to parts per million1 ppb = 0.001 ppmparts per million = parts per billion ÷ 1,000
Parts per million to parts per billion1 ppm = 1,000 ppbparts per billion = parts per million × 1,000
Milligrams per deciliter to grams per liter1 mg/dL = 0.01 g/Lgrams per liter = milligrams per deciliter ÷ 100
Grams per liter to milligrams per deciliter1 g/L = 100 mg/dLmilligrams per deciliter = grams per liter × 100

Supported concentration units

UnitSymbolEqual to
Gram per literg/L1 g/L
Milligram per litermg/L0.001 g/L
Microgram per literµg/L0.000001 g/L
Kilogram per cubic meterkg/m³1 g/L
Gram per deciliterg/dL10 g/L
Milligram per decilitermg/dL0.01 g/L
Milligram per millilitermg/mL1 g/L
Microgram per milliliterµg/mL0.001 g/L
Gram per milliliterg/mL1,000 g/L
Part per million (in water)ppm0.001 g/L
Part per billion (in water)ppb0.000001 g/L
Percent weight/volume% w/v10 g/L
Grain per US gallongr/gal0.01711806 g/L

Mass concentration units

Mass concentration is the mass of a dissolved substance per volume of solution. Lab results usually use g/L, mg/L or mg/dL, while water quality reports use ppm and ppb.

ppm and mg/L: in dilute water solutions one liter weighs almost exactly one kilogram, so 1 mg/L equals 1 part per million by mass. This converter uses that convention. It does not hold for liquids with a density far from 1 kg/L, or for gases.

Percent (w/v): 1% w/v is 1 gram per 100 mL, which is 10 g/L or 10,000 ppm.

Molar concentration (mol/L) is a different quantity: converting to it needs the molar mass of the substance.

Frequently asked questions

Is ppm the same as mg/L?

For dilute solutions in water, yes: 1 ppm equals 1 mg/L because one liter of water weighs about one kilogram.

How do I convert ppm to percent?

Divide ppm by 10,000. For example, 5,000 ppm is 0.5%.

How many ppb are in 1 ppm?

There are 1,000 parts per billion in one part per million.

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