Conversion method
Molar concentration means moles of solute per solution volume. It is distinct from molality, mass concentration and mass percentage.
mol/L = x × 0.001
10 mol/m³ = 0.01 mol/L.
| mol/m³ | mol/L |
|---|---|
| 1 | 0.001 |
| 5 | 0.005 |
| 10 | 0.01 |
| 25 | 0.025 |
| 50 | 0.05 |
| 100 | 0.1 |
Unit definitions and sources
Molar concentration means moles of solute per solution volume. It is distinct from molality, mass concentration and mass percentage.
| Unit and system | Use | Definition | Relationship |
|---|---|---|---|
| Mole per cubic meter (mol/m³); si | Common units | Mole per cubic meter: base (mol-m3) = value × 1. Common use: Molar Concentration. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Mole per liter (mol/L); si | Common units | Mole per liter: base (mol-m3) = value × 1000. Common use: Molar Concentration. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Millimole per liter (mmol/L); si | Specialist units | Millimole per liter: base (mol-m3) = value × 1. Common use: Molar Concentration. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Micromole per liter (µmol/L); si | Specialist units | Micromole per liter: base (mol-m3) = value × 0.001. Common use: Molar Concentration. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Kilomole per cubic meter (kmol/m³); si | Specialist units | Kilomole per cubic meter: base (mol-m3) = value × 1000. Common use: Molar Concentration. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Mol/cubic centimeter (mol/(cm³)); other | Specialist units | mol/cubic centimeter = 999999.9999999999 mol-m3, derived from the component SI/customary definitions. Common use: Molar Concentration. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Mol/cubic millimeter (mol/(mm³)); other | Specialist units | mol/cubic millimeter = 999999999.9999999 mol-m3, derived from the component SI/customary definitions. Common use: Molar Concentration. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Kilomol/liter (kmol/(L)); other | Specialist units | kilomol/liter = 1000000.0 mol-m3, derived from the component SI/customary definitions. Common use: Molar Concentration. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Kilomol/cubic centimeter (kmol/(cm³)); other | Specialist units | kilomol/cubic centimeter = 999999999.9999999 mol-m3, derived from the component SI/customary definitions. Common use: Molar Concentration. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Kilomol/cubic millimeter (kmol/(mm³)); other | Specialist units | kilomol/cubic millimeter = 999999999999.9999 mol-m3, derived from the component SI/customary definitions. Common use: Molar Concentration. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Millimol/cubic meter (mmol/(m³)); other | Specialist units | millimol/cubic meter = 0.001 mol-m3, derived from the component SI/customary definitions. Common use: Molar Concentration. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Millimol/cubic centimeter (mmol/(cm³)); other | Specialist units | millimol/cubic centimeter = 999.9999999999999 mol-m3, derived from the component SI/customary definitions. Common use: Molar Concentration. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Millimol/cubic millimeter (mmol/(mm³)); other | Specialist units | millimol/cubic millimeter = 1000000.0 mol-m3, derived from the component SI/customary definitions. Common use: Molar Concentration. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
Sources: NIST: SP 811 Appendix B.8: conversion factors; BIPM: SI prefixes
Precision of molar concentration conversions
All 13 molar concentration units convert through Mole per cubic meter (mol/m³). 13 have an exact defined relationship to the base unit and 0 are conventional or measured values. Results and the tables on this page come from the same engine, so a table value can be checked against the converter directly.
Standard display shows up to six decimal places, switching to scientific notation for very large or small values. Calculation uses JavaScript binary floating point independently of display rounding, so extra digits are not a claim about measurement accuracy. Each unit lists its own source; a citation records where the definition comes from, not an independent review. See Conversion methodology for the review and correction process.