Concentration Converter

Molar (M)

Millimolar (mM)

Micromolar (μM)

Parts per million (ppm)

Parts per billion (ppb)

Molecules per cubic centimeter (molec/cm³)

Molecules per cubic nanometer (molec/nm³)

Molecules per cubic angstrom (molec/Å³)

Concentration Unit Conversion Chart

1 M = 1,000 mM

M to mM, molar to millimolar, convert molar to millimolar

1 M = 1,000,000 μM

M to μM, molar to micromolar, convert molar to micromolar

1 M = 1,000,000 ppm

M to ppm, molar to ppm, convert molar to ppm

1 M = 1,000,000,000 ppb

M to ppb, molar to ppb, convert molar to ppb

1 M = 602,213,737,699,784,400,000 molec/cm³

M to molec/cm³, molar to moleculePerCubicCentimeter, convert molar to moleculePerCubicCentimeter

1 M = 602,213.738 molec/nm³

M to molec/nm³, molar to moleculePerCubicNanometer, convert molar to moleculePerCubicNanometer

1 M = 0.000602214 molec/Å³

M to molec/Å³, molar to moleculePerCubicAngstrom, convert molar to moleculePerCubicAngstrom

1 mM = 0.00100000 M

mM to M, millimolar to molar, convert millimolar to molar

1 mM = 1,000 μM

mM to μM, millimolar to micromolar, convert millimolar to micromolar

1 mM = 1,000 ppm

mM to ppm, millimolar to ppm, convert millimolar to ppm

1 mM = 1,000,000 ppb

mM to ppb, millimolar to ppb, convert millimolar to ppb

1 mM = 602,213,737,699,784,400 molec/cm³

mM to molec/cm³, millimolar to moleculePerCubicCentimeter, convert millimolar to moleculePerCubicCentimeter

1 mM = 602.214 molec/nm³

mM to molec/nm³, millimolar to moleculePerCubicNanometer, convert millimolar to moleculePerCubicNanometer

1 mM = 6.02214e-7 molec/Å³

mM to molec/Å³, millimolar to moleculePerCubicAngstrom, convert millimolar to moleculePerCubicAngstrom

1 μM = 0.00000100000 M

μM to M, micromolar to molar, convert micromolar to molar

1 μM = 0.00100000 mM

μM to mM, micromolar to millimolar, convert micromolar to millimolar

1 μM = 1 ppm

μM to ppm, micromolar to ppm, convert micromolar to ppm

1 μM = 1,000 ppb

μM to ppb, micromolar to ppb, convert micromolar to ppb

1 μM = 602,213,737,699,784.4 molec/cm³

μM to molec/cm³, micromolar to moleculePerCubicCentimeter, convert micromolar to moleculePerCubicCentimeter

1 μM = 0.602214 molec/nm³

μM to molec/nm³, micromolar to moleculePerCubicNanometer, convert micromolar to moleculePerCubicNanometer

1 μM = 6.02214e-10 molec/Å³

μM to molec/Å³, micromolar to moleculePerCubicAngstrom, convert micromolar to moleculePerCubicAngstrom

1 ppm = 0.00000100000 M

ppm to M, ppm to molar, convert ppm to molar

1 ppm = 0.00100000 mM

ppm to mM, ppm to millimolar, convert ppm to millimolar

1 ppm = 1 μM

ppm to μM, ppm to micromolar, convert ppm to micromolar

1 ppm = 1,000 ppb

ppm to ppb, ppm to ppb, convert ppm to ppb

1 ppm = 602,213,737,699,784.4 molec/cm³

ppm to molec/cm³, ppm to moleculePerCubicCentimeter, convert ppm to moleculePerCubicCentimeter

1 ppm = 0.602214 molec/nm³

ppm to molec/nm³, ppm to moleculePerCubicNanometer, convert ppm to moleculePerCubicNanometer

1 ppm = 6.02214e-10 molec/Å³

ppm to molec/Å³, ppm to moleculePerCubicAngstrom, convert ppm to moleculePerCubicAngstrom

1 ppb = 1.00000e-9 M

ppb to M, ppb to molar, convert ppb to molar

1 ppb = 0.00000100000 mM

ppb to mM, ppb to millimolar, convert ppb to millimolar

1 ppb = 0.00100000 μM

ppb to μM, ppb to micromolar, convert ppb to micromolar

1 ppb = 0.00100000 ppm

ppb to ppm, ppb to ppm, convert ppb to ppm

1 ppb = 602,213,737,699.784 molec/cm³

ppb to molec/cm³, ppb to moleculePerCubicCentimeter, convert ppb to moleculePerCubicCentimeter

1 ppb = 0.000602214 molec/nm³

ppb to molec/nm³, ppb to moleculePerCubicNanometer, convert ppb to moleculePerCubicNanometer

1 ppb = 6.02214e-13 molec/Å³

ppb to molec/Å³, ppb to moleculePerCubicAngstrom, convert ppb to moleculePerCubicAngstrom

1 molec/cm³ = 1.66054e-21 M

molec/cm³ to M, moleculePerCubicCentimeter to molar, convert moleculePerCubicCentimeter to molar

1 molec/cm³ = 1.66054e-18 mM

molec/cm³ to mM, moleculePerCubicCentimeter to millimolar, convert moleculePerCubicCentimeter to millimolar

1 molec/cm³ = 1.66054e-15 μM

molec/cm³ to μM, moleculePerCubicCentimeter to micromolar, convert moleculePerCubicCentimeter to micromolar

1 molec/cm³ = 1.66054e-15 ppm

molec/cm³ to ppm, moleculePerCubicCentimeter to ppm, convert moleculePerCubicCentimeter to ppm

1 molec/cm³ = 1.66054e-12 ppb

molec/cm³ to ppb, moleculePerCubicCentimeter to ppb, convert moleculePerCubicCentimeter to ppb

1 molec/cm³ = 1.00000e-15 molec/nm³

molec/cm³ to molec/nm³, moleculePerCubicCentimeter to moleculePerCubicNanometer, convert moleculePerCubicCentimeter to moleculePerCubicNanometer

1 molec/cm³ = 1.00000e-24 molec/Å³

molec/cm³ to molec/Å³, moleculePerCubicCentimeter to moleculePerCubicAngstrom, convert moleculePerCubicCentimeter to moleculePerCubicAngstrom

1 molec/nm³ = 0.00000166054 M

molec/nm³ to M, moleculePerCubicNanometer to molar, convert moleculePerCubicNanometer to molar

1 molec/nm³ = 0.00166054 mM

molec/nm³ to mM, moleculePerCubicNanometer to millimolar, convert moleculePerCubicNanometer to millimolar

1 molec/nm³ = 1.661 μM

molec/nm³ to μM, moleculePerCubicNanometer to micromolar, convert moleculePerCubicNanometer to micromolar

1 molec/nm³ = 1.661 ppm

molec/nm³ to ppm, moleculePerCubicNanometer to ppm, convert moleculePerCubicNanometer to ppm

1 molec/nm³ = 1,660.54 ppb

molec/nm³ to ppb, moleculePerCubicNanometer to ppb, convert moleculePerCubicNanometer to ppb

1 molec/nm³ = 1,000,000,000,000,000 molec/cm³

molec/nm³ to molec/cm³, moleculePerCubicNanometer to moleculePerCubicCentimeter, convert moleculePerCubicNanometer to moleculePerCubicCentimeter

1 molec/nm³ = 1.00000e-9 molec/Å³

molec/nm³ to molec/Å³, moleculePerCubicNanometer to moleculePerCubicAngstrom, convert moleculePerCubicNanometer to moleculePerCubicAngstrom

1 molec/Å³ = 1,660.54 M

molec/Å³ to M, moleculePerCubicAngstrom to molar, convert moleculePerCubicAngstrom to molar

1 molec/Å³ = 1,660,540 mM

molec/Å³ to mM, moleculePerCubicAngstrom to millimolar, convert moleculePerCubicAngstrom to millimolar

1 molec/Å³ = 1,660,540,000 μM

molec/Å³ to μM, moleculePerCubicAngstrom to micromolar, convert moleculePerCubicAngstrom to micromolar

1 molec/Å³ = 1,660,540,000 ppm

molec/Å³ to ppm, moleculePerCubicAngstrom to ppm, convert moleculePerCubicAngstrom to ppm

1 molec/Å³ = 1,660,540,000,000 ppb

molec/Å³ to ppb, moleculePerCubicAngstrom to ppb, convert moleculePerCubicAngstrom to ppb

1 molec/Å³ = 1,000,000,000,000,000,000,000,000 molec/cm³

molec/Å³ to molec/cm³, moleculePerCubicAngstrom to moleculePerCubicCentimeter, convert moleculePerCubicAngstrom to moleculePerCubicCentimeter

1 molec/Å³ = 1,000,000,000 molec/nm³

molec/Å³ to molec/nm³, moleculePerCubicAngstrom to moleculePerCubicNanometer, convert moleculePerCubicAngstrom to moleculePerCubicNanometer

Concentration conversion calculator supports multiple concentration units including molar, millimolar, micromolar, and molecular density units. Convert between molar concentration units and molecular density measurements with high precision for chemistry and biology applications.

Common concentration unit conversions: molar to millimolar (M to mM), millimolar to micromolar (mM to μM), molecules per cubic centimeter to molar (molec/cm³ to M), molecules per cubic nanometer to molar (molec/nm³ to M). Convert concentration units easily with precise calculations for scientific research.

Principles & formula sources

“Concentration” can mean different quantities: molar concentration (mol/L), mass concentration (g/L), or dimensionless ratios (%, ppm). Conversions are straightforward only within the same type.

This converter provides direct scaling for compatible units (e.g., mol/L↔mmol/L). Converting between molar and mass units requires extra inputs such as molar mass or density.

Formula & example

Formula: scale within the same concentration type using the defined factors.

Example: 1 mol/L = 1000 mmol/L; 1% = 10000 ppm (mass fraction).

Common errors & notes

ppm/ppb conventions vary (mass vs mole fraction). Document your basis.
Molarity depends on volume; temperature can affect volume slightly.
w/w%, w/v%, and v/v% are different definitions—don’t mix them.

Practical use cases

Concentration conversions are used for solution prep, water quality checks, and chemical assays with mol/L, g/L, or ppm.

Convert within the same concentration type unless you have the needed extra inputs (molar mass, density).

References / data sources

IUPAC Gold Book — Definitions of concentration terms
IUPAC Green Book — Quantities, Units and Symbols in Physical Chemistry
BIPM — SI Brochure (mole and prefixes)