maratoolHow to convert molar mass units (g/mol, kg/mol, Da)
Type a molar mass — read g/mol, kg/mol, kg/kmol, Da, or lb/lb-mol instantly.
SI process calculations want kg/mol, bench chemistry uses g/mol, and proteomics reports daltons. The Molar Mass Converter shifts between them without dropped decimals.
How it works
- Pick units — "Gram per mole (g/mol)" to "Kilogram per mole (kg/mol)", or any other pair.
- Type a value — the result updates as you type, with swap and copy.
- Copy — one click, with "Copied!" feedback.
Molar mass conversion factors
Every unit converts through the gram per mole (the base unit). To convert A → B, multiply by A's factor and divide by B's:
| Unit | = this many gram per moles |
|---|---|
| Kilogram per mole (kg/mol) | 1,000 |
| Gram per mole (g/mol) | 1 |
| Milligram per mole (mg/mol) | 0.001 |
| Kilogram per kilomole (kg/kmol) | 1 |
| Pound per pound-mole (lb/lb-mol) | 1 |
| Dalton (Da) | 1 |
When you need it
The useful identity: g/mol = kg/kmol = lb/lb-mol = Da, so most "conversions" are really sanity checks — only kg/mol moves the decimal three places. A 66.5 kDa protein is 66,500 g/mol or 0.0665 kg/mol.
Sources & methodology
Conversion factors follow BIPM SI Brochure; exact-by-definition factors are marked in the tool itself. All math runs client-side in your browser — nothing is uploaded.
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