Convert between ppm, ppb, ppt, percent and permille. Free and accurate tool for chemistry, environment and water quality.
Parts per million (ppm) is a dimensionless concentration unit that expresses the proportion of a substance relative to the total — 1 ppm means one part of solute for every one million parts of solution. It is widely used in chemistry, environmental analysis, water quality, air pollutant monitoring, and industrial specifications, where the concentrations of interest are too small to be conveniently expressed as a percentage. The "parts per" family follows powers of a thousand: ppm (10⁻⁶), ppb — parts per billion (10⁻⁹), and ppt — parts per trillion (10⁻¹²). Percentage (%) equals 10⁻² (10,000 ppm) and permille (‰) equals 10⁻³ (1,000 ppm). Thus, 1% = 10,000 ppm = 10,000,000 ppb, and 1 ppm = 0.0001%. This converter calculates between ppm, ppb, ppt, percent, and permille using exact SI factors, ensuring reliable results for laboratory reports, label interpretation, and regulatory limit comparisons. It is essential for chemists, environmental engineers, water treatment technicians, and professionals dealing with purity and contamination specifications.
PPM means parts per million: 1 ppm equals 1 part of solute in 1,000,000 parts of solution (10⁻⁶).
1% equals 10,000 ppm (1% = 10⁻² = 10,000 × 10⁻⁶).
Multiply by 1,000. Example: 5 ppm = 5,000 ppb.
PPb (parts per billion) is 1,000 times smaller than ppm. 1 ppm = 1,000 ppb = 1,000,000 ppt.
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