Convert mol/L, g/L, ppm, and % solution free and instant. No sign-up required.
Scientific and technical measurements
International System of Units (SI) measurements
mol/L, mmol/L, µmol/L, nmol/L
g/L, mg/L, µg/L
ppm, ppb, ppt, %
This free molarity converter handles mol/L, g/L, ppm, and % solution for chemistry labs, biology, and pharma. Molarity (M) measures the concentration of a solution in moles of solute per liter of solution—the most common way to express concentration in laboratory settings and essential for stoichiometric calculations.
For very dilute solutions, scientists often use parts per million (ppm) or parts per billion (ppb). One ppm equals 1 mg/L for dilute aqueous solutions, while one ppb equals 1 µg/L. These units are particularly useful in environmental chemistry and toxicology where concentrations are extremely low.
Our converter handles the full range of concentration units from nanomolar (nM) to percentage solutions, making it easy to work with any concentration scale. For mass fraction and ppm use our Concentration Converter; for salinity and TDS see the Salinity and TDS Converter; for pH try our pH Converter. Whether you're preparing a 1 M stock solution or measuring trace contaminants at ppt levels, this tool provides accurate conversions for all your laboratory needs.
Added Nov 7, 2025
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Convert between concentration units including mass fraction, mole fraction, ppm, ppb, and more. Essential for chemistry labs, environmental testing, and pharmaceuticals.
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 different viscosity units including Pa·s, poise, centipoise, and stokes. Essential for chemical engineering, fluid dynamics, and materials science.
Convert between concentration units including mass fraction, mole fraction, ppm, ppb, and more. Essential for chemistry labs, environmental testing, and pharmaceuticals.
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