Moles and mass are linked by the molar mass (molecular weight) of the substance in g/mol: mass in grams = moles × molar mass, and moles = mass ÷ molar mass. Because every substance has its own molar mass, these converters ask for it, and then handle the unit prefixes (mol, mmol, µmol, nmol, pmol and g, mg, µg, ng, pg) for you. Pick a pair below to open its converter, table and worked examples.
Converters in This Group
From mol (mole)
From g (gram)
From mg (milligram)
- mg to mol÷ MW ÷ 1,000
- mg to mmol÷ MW
- mg to µmol÷ MW × 1,000
- mg to nmol÷ MW × 1,000,000
- mg to pmol÷ MW × 1,000,000,000
From µg (microgram)
- µg to mol÷ MW ÷ 1,000,000
- µg to mmol÷ MW ÷ 1,000
- µg to µmol÷ MW
- µg to nmol÷ MW × 1,000
- µg to pmol÷ MW × 1,000,000
From ng (nanogram)
- ng to mol÷ MW ÷ 1,000,000,000
- ng to mmol÷ MW ÷ 1,000,000
- ng to µmol÷ MW ÷ 1,000
- ng to nmol÷ MW
- ng to pmol÷ MW × 1,000
From pg (picogram)
- pg to mol÷ MW ÷ 10¹²
- pg to mmol÷ MW ÷ 1,000,000,000
- pg to µmol÷ MW ÷ 1,000,000
- pg to nmol÷ MW ÷ 1,000
- pg to pmol÷ MW
From mmol (millimole)
- mmol to g× MW ÷ 1,000
- mmol to mg× MW
- mmol to µg× MW × 1,000
- mmol to ng× MW × 1,000,000
- mmol to pg× MW × 1,000,000,000
From µmol (micromole)
- µmol to mg× MW ÷ 1,000
- µmol to µg× MW
- µmol to ng× MW × 1,000
- µmol to pg× MW × 1,000,000
From nmol (nanomole)
- nmol to mg× MW ÷ 1,000,000
- nmol to µg× MW ÷ 1,000
- nmol to ng× MW
- nmol to pg× MW × 1,000
From pmol (picomole)
- pmol to mg× MW ÷ 1,000,000,000
- pmol to µg× MW ÷ 1,000,000
- pmol to ng× MW ÷ 1,000
- pmol to pg× MW
Unit Reference
| Unit | Name | Equals |
|---|---|---|
| mol | Mole | 1 mol = 1 mol |
| mmol | Millimole | 1 mmol = 0.001 mol |
| µmol | Micromole | 1 µmol = 0.000001 mol |
| nmol | Nanomole | 1 nmol = 1 × 10⁻⁹ mol |
| pmol | Picomole | 1 pmol = 1 × 10⁻¹² mol |
| Unit | Name | Equals |
|---|---|---|
| g | Gram | 1 g = 1 g |
| mg | Milligram | 1 mg = 0.001 g |
| µg | Microgram | 1 µg = 0.000001 g |
| ng | Nanogram | 1 ng = 1 × 10⁻⁹ g |
| pg | Picogram | 1 pg = 1 × 10⁻¹² g |
How These Conversions Work
Multiply moles by the molar mass to get grams, and divide grams by the molar mass to get moles, then shift the result by powers of ten for the unit prefix. For example, 0.5 mol of a substance with a molar mass of 180 g/mol weighs 0.5 × 180 = 90 g, and 1 mmol of it weighs 180 mg.
More Converters
Looking for a different kind of unit? Try the molar amount converters, molar concentration converters and mass concentration converters. You can also browse all lab converters or open the mmol/L to mg/dL conversion charts.
These tools convert units only and do not give medical advice. Read our editorial policy.