Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Biology
Protein Extinction Coefficient Calculator
Estimates a protein's molar extinction coefficient at 280 nm from its tryptophan, tyrosine, and cysteine residue counts. Used to calculate protein concentration from UV absorbance measurements.
Fill in the required fields to see your result.
Biology
Protein Molecular Weight Calculator
Estimates the molecular weight of a protein from its amino acid count and average residue mass. Use it when designing proteins, interpreting SDS-PAGE results, or planning purification workflows.
Fill in the required fields to see your result.
Key differences
| Protein Extinction Coefficient Calculator | Protein Molecular Weight Calculator | |
|---|---|---|
| Category | Biology | Biology |
| Inputs required | 3 | 2 |
| Result | Extinction Coefficient (M⁻¹cm⁻¹) | Protein Molecular Weight (Da) |
| What it does | Estimates a protein's molar extinction coefficient at 280 nm from its tryptophan, tyrosine, and cysteine residue counts. Used to calculate protein concentration from UV absorbance measurements. | Estimates the molecular weight of a protein from its amino acid count and average residue mass. Use it when designing proteins, interpreting SDS-PAGE results, or planning purification workflows. |