PPM to percent, ppb to mg/L, g/L to ppm, plus mass and mole fraction—free and instant. For chemistry labs, environmental testing, and pharma. No sign-up required.
Scientific and technical measurements
International System of Units (SI) measurements
This free concentration converter supports ppm to percent, mass fraction, mole fraction, ppm, ppb, and more for chemistry labs, environmental testing, and pharmaceuticals. For molarity (mol/L, g/L) use our Molarity Converter; for salinity and TDS see the Salinity and TDS Converter; for acidity try our pH Converter.
Convert between molarity, mass concentration, and percentage solutions for chemical reactions and analysis.
Convert between ppm, ppb, and other concentration units for water quality, air pollution, and soil analysis.
Convert drug concentrations between different units for dosage calculations and formulation.
Unit fractions, percentages, and parts per million/billion/trillion for precise concentration measurements.
Mass per volume concentration units for solid and liquid solutions.
Moles per volume concentration units for chemical calculations.
Weight per volume concentration units for dense solutions.
Weight per weight concentration units for solid mixtures.
Our concentration converter uses unit fractions (0 to 1) as the base unit for all fraction-based conversions, ensuring accurate relationships between percentages, ppm, ppb, and ppt.
Mass and molar concentrations are converted using standard relationships and molecular weights for accurate chemical calculations.
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Convert between molarity units including mol/L, g/L, ppm, and % solution. Essential for chemistry labs, biology research, and pharmaceutical industry.
Convert between salinity and total dissolved solids units including PSU, g/kg, mg/L, and more
Convert between pH values, hydrogen ion concentrations (H+), hydroxide ion concentrations (OH-), and pOH. Essential for chemistry labs and water quality testing
Convert between molarity units including mol/L, g/L, ppm, and % solution. Essential for chemistry labs, biology research, and pharmaceutical industry.
Convert between different viscosity units including Pa·s, poise, centipoise, and stokes. Essential for chemical engineering, fluid dynamics, and materials science.
Convert between flow rate units including L/s, m³/h, gal/min, cfm, and more. Perfect for HVAC, plumbing, chemical engineering, and irrigation applications
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