Protein molecular weight calculator kDa
The rule of thumb for conversion of microgram amounts into picomole amounts at different protein molecular weights and peptide molecular weights is:
1000/Mw of protein in kDa = pmol/ug
| Protein size kDa | Microgram | Picomole | Microgram | Picomole |
| 1 | 1 | 1000 | 1 | 1000 |
| 10 | 10 | 1000 | 1 | 100 |
| 20 | 20 | 1000 | 1 | 50 |
| 50 | 50 | 1000 | 1 | 20 |
| 100 | 100 | 1000 | 1 | 10 |
| 150 | 150 | 1000 | 1 | 6.7 |
Useful Links
Free protein bioinformatics tool GPMAW lite
Compute pI/Mw tool from protein amino acid sequence or database accession number:
https://www.expasy.org/compute_pi/
Protein MW determination by mass spectrometry: