Unit Converter

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

Molar (mol/L) to Millimolar (mmol/L)

1 M = 1,000,000 μM

Molar (mol/L) to Micromolar (umol/L)

1 M = 1,000,000 ppm

Molar (mol/L) to Parts per million (ppm)

1 M = 1,000,000,000 ppb

Molar (mol/L) to Parts per billion (ppb)

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

Molar (mol/L) to Molecules per cubic centimeter (molec/cm3)

1 M = 602,213.738 molec/nm³

Molar (mol/L) to Molecules per cubic nanometer (molec/nm3)

1 M = 0.000602214 molec/Å³

Molar (mol/L) to Molecules per cubic angstrom (molec/A3)

1 mM = 0.00100000 M

Millimolar (mmol/L) to Molar (mol/L)

1 mM = 1,000 μM

Millimolar (mmol/L) to Micromolar (umol/L)

1 mM = 1,000 ppm

Millimolar (mmol/L) to Parts per million (ppm)

1 mM = 1,000,000 ppb

Millimolar (mmol/L) to Parts per billion (ppb)

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

Millimolar (mmol/L) to Molecules per cubic centimeter (molec/cm3)

1 mM = 602.214 molec/nm³

Millimolar (mmol/L) to Molecules per cubic nanometer (molec/nm3)

1 mM = 6.02214e-7 molec/Å³

Millimolar (mmol/L) to Molecules per cubic angstrom (molec/A3)

1 μM = 0.00000100000 M

Micromolar (umol/L) to Molar (mol/L)

1 μM = 0.00100000 mM

Micromolar (umol/L) to Millimolar (mmol/L)

Micromolar (umol/L) to Parts per million (ppm)

1 μM = 1,000 ppb

Micromolar (umol/L) to Parts per billion (ppb)

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

Micromolar (umol/L) to Molecules per cubic centimeter (molec/cm3)

1 μM = 0.602214 molec/nm³

Micromolar (umol/L) to Molecules per cubic nanometer (molec/nm3)

1 μM = 6.02214e-10 molec/Å³

Micromolar (umol/L) to Molecules per cubic angstrom (molec/A3)

1 ppm = 0.00000100000 M

Parts per million (ppm) to Molar (mol/L)

1 ppm = 0.00100000 mM

Parts per million (ppm) to Millimolar (mmol/L)

Parts per million (ppm) to Micromolar (umol/L)

1 ppm = 1,000 ppb

Parts per million (ppm) to Parts per billion (ppb)

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

Parts per million (ppm) to Molecules per cubic centimeter (molec/cm3)

1 ppm = 0.602214 molec/nm³

Parts per million (ppm) to Molecules per cubic nanometer (molec/nm3)

1 ppm = 6.02214e-10 molec/Å³

Parts per million (ppm) to Molecules per cubic angstrom (molec/A3)

1 ppb = 1.00000e-9 M

Parts per billion (ppb) to Molar (mol/L)

1 ppb = 0.00000100000 mM

Parts per billion (ppb) to Millimolar (mmol/L)

1 ppb = 0.00100000 μM

Parts per billion (ppb) to Micromolar (umol/L)

1 ppb = 0.00100000 ppm

Parts per billion (ppb) to Parts per million (ppm)

1 ppb = 602,213,737,699.784 molec/cm³

Parts per billion (ppb) to Molecules per cubic centimeter (molec/cm3)

1 ppb = 0.000602214 molec/nm³

Parts per billion (ppb) to Molecules per cubic nanometer (molec/nm3)

1 ppb = 6.02214e-13 molec/Å³

Parts per billion (ppb) to Molecules per cubic angstrom (molec/A3)

1 molec/cm³ = 1.66054e-21 M

Molecules per cubic centimeter (molec/cm3) to Molar (mol/L)

1 molec/cm³ = 1.66054e-18 mM

Molecules per cubic centimeter (molec/cm3) to Millimolar (mmol/L)

1 molec/cm³ = 1.66054e-15 μM

Molecules per cubic centimeter (molec/cm3) to Micromolar (umol/L)

1 molec/cm³ = 1.66054e-15 ppm

Molecules per cubic centimeter (molec/cm3) to Parts per million (ppm)

1 molec/cm³ = 1.66054e-12 ppb

Molecules per cubic centimeter (molec/cm3) to Parts per billion (ppb)

1 molec/cm³ = 1.00000e-15 molec/nm³

Molecules per cubic centimeter (molec/cm3) to Molecules per cubic nanometer (molec/nm3)

1 molec/cm³ = 1.00000e-24 molec/Å³

Molecules per cubic centimeter (molec/cm3) to Molecules per cubic angstrom (molec/A3)

1 molec/nm³ = 0.00000166054 M

Molecules per cubic nanometer (molec/nm3) to Molar (mol/L)

1 molec/nm³ = 0.00166054 mM

Molecules per cubic nanometer (molec/nm3) to Millimolar (mmol/L)

1 molec/nm³ = 1.661 μM

Molecules per cubic nanometer (molec/nm3) to Micromolar (umol/L)

1 molec/nm³ = 1.661 ppm

Molecules per cubic nanometer (molec/nm3) to Parts per million (ppm)

1 molec/nm³ = 1,660.54 ppb

Molecules per cubic nanometer (molec/nm3) to Parts per billion (ppb)

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

Molecules per cubic nanometer (molec/nm3) to Molecules per cubic centimeter (molec/cm3)

1 molec/nm³ = 1.00000e-9 molec/Å³

Molecules per cubic nanometer (molec/nm3) to Molecules per cubic angstrom (molec/A3)

1 molec/Å³ = 1,660.54 M

Molecules per cubic angstrom (molec/A3) to Molar (mol/L)

1 molec/Å³ = 1,660,540 mM

Molecules per cubic angstrom (molec/A3) to Millimolar (mmol/L)

1 molec/Å³ = 1,660,540,000 μM

Molecules per cubic angstrom (molec/A3) to Micromolar (umol/L)

1 molec/Å³ = 1,660,540,000 ppm

Molecules per cubic angstrom (molec/A3) to Parts per million (ppm)

1 molec/Å³ = 1,660,540,000,000 ppb

Molecules per cubic angstrom (molec/A3) to Parts per billion (ppb)

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

Molecules per cubic angstrom (molec/A3) to Molecules per cubic centimeter (molec/cm3)

1 molec/Å³ = 1,000,000,000 molec/nm³

Molecules per cubic angstrom (molec/A3) to Molecules per cubic nanometer (molec/nm3)

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.

Popular Unit Conversions

Direct links to common conversion pages with formulas, tables, and FAQ.

mol/L to mmol/LMolar (mol/L) to Millimolar (mmol/L)mmol/L to mol/LMillimolar (mmol/L) to Molar (mol/L)mol/L to umol/LMolar (mol/L) to Micromolar (umol/L)umol/L to mol/LMicromolar (umol/L) to Molar (mol/L)mmol/L to umol/LMillimolar (mmol/L) to Micromolar (umol/L)umol/L to mmol/LMicromolar (umol/L) to Millimolar (mmol/L)ppm to ppbParts per million (ppm) to Parts per billion (ppb)ppb to ppmParts per billion (ppb) to Parts per million (ppm)ppm to mol/LParts per million (ppm) to Molar (mol/L)mol/L to ppmMolar (mol/L) to Parts per million (ppm)ppb to mol/LParts per billion (ppb) to Molar (mol/L)mol/L to ppbMolar (mol/L) to Parts per billion (ppb)

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)