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
You can use the table below for a quick conversion of your protein, depending on its size:
| 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 |
In other situations you may want to learn more about the properties of your protein. In those cases, the GPMAW lite tool will come in handy. It is free and easy to use:
Try GPMAW lite – free bioinformatics tool
Useful Links and Protein Molecular Weight Calculator
Use the free tool to calculate the basic properties of your protein:
Free protein bioinformatics tool GPMAW lite
Compute the pI/Mw tool from an protein amino acid sequence or a database accession number:
https://web.expasy.org/compute_pi/
Find out how to perform protein MW determination by mass spectrometry:
Molecular Weight Determination
Learn more in about how to make simple bioinformatics calculations on specific protein sequences in this blog post.