PPM Converter (ppm ⇄ %, ppb, mg/L)
PPM converter: convert concentrations between ppm, ppb, ppt, percent, mg/L, g/L and mg/kg, with mol/L if you enter the molar mass.
1 % = 10,000 ppm · 1 ppm = 1,000 ppb ≈ 1 mg/L in water
How to use this calculator
- Type your input in the box.
- The result updates as you type.
- Use “Copy result” or “Copy link” to share it.
For dilute water solutions 1 ppm ≈ 1 mg/L, because 1 L of water weighs about 1 kg. 1 % = 10,000 ppm.
Frequently asked questions
250 ppm of salt (NaCl, 58.44 g/mol)?
0.025 % = 250 mg/L ≈ 4.28 mmol/L.
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