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Solution & Concentration Calculators

PPM Calculator

Convert between ppm, ppb, percent and mg/L, for water quality and trace concentrations.

Also known as parts per million, ppb calculator, ppm to percent.

Enter values

Results update as you type.

Result

Parts per million

250 ppm

Parts per billion
250,000
Percent
0.025 %
mg/L (in water)
250
g/L
0.25
Mass in 1 L
250 mg

About the PPM Calculator

Convert between ppm, ppb, percent and mg/L, for water quality and trace concentrations.

Also known as: parts per million, ppb calculator, ppm to percent, mg/l to ppm, ppm conversion.

How to use this calculator

  1. Enter value is in, value, sample volume (optional).
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

PPM formula

1 ppm = 1 mg/L in water = 0.0001%

Worked example

Using the values pre-filled in the calculator above:

  • Value is in: ppm
  • Value = 250
  • Sample volume (optional) = 1 L

the calculator returns:

  • Parts per million: 250 ppm
  • Parts per billion: 250,000
  • Percent: 0.025 %
  • mg/L (in water): 250