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Solution & Concentration Calculators

PPM Calculator

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

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.

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