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Concentration Converter

Convert between ppm, ppb, percent, mg/L, g/L, and molarity.

Last updated: May 18, 2026 By KAMP Inc. / UnitOwl

Accuracy verified. Conversions on this page are calculated against ISO 80000 and NIST standards and reviewed for correctness.

Amount

From

To

Result

1,000 ppb

1 ppm = 1,000 ppb

Popular Concentration Conversions

PPM to Percent Percent to PPM PPM to PPB PPM to mg/L

Further Reading

EPA — Drinking Water Regulations NIST Special Publication 811 — Guide for SI Units

Sources & References

NIST — Units and Conversion Factors — Official unit conversion factors from the National Institute of Standards and Technology.
BIPM — The International System of Units (SI) — International SI unit definitions from the International Bureau of Weights and Measures.