Peptide sequence analyzer
See what your sequence is made of.
Calculated locally in your browser.
Your sequence, connected
Enter a sequence, or try the example.
Select a residue to explore its identity.
Sequence schematic — not a predicted 3D structure.
The calculation trail will appear here.
Mass, pI & charge details
- Length (residues)
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- Average mass (Da)
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- Monoisotopic mass (Da)
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- Theoretical pI (estimated)
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- Net charge (estimated)
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- GRAVY
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Molecular formula
A280 extinction estimate
Residue counts
Terminal modifications affect calculated properties.
From calculation to catalog
Explore related product families
Catalog navigation, not a recommendation for biological use. These selections do not depend on your inputs or results. Confirm molecular form and lot documentation separately.
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KPV
2 catalog variants · Identity & research references
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BPC-157
4 catalog variants · Identity & research references
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Thymosin Alpha-1
2 catalog variants · Identity & research references
View product family ↗Calculation basis
Methods and source records
These links document the calculation conventions or laboratory context. They do not validate a catalog lot or replace a controlled laboratory method.
- 01Technical source
ProtParam documentation
SIB ExPASy. Calculation notes for molecular weight, theoretical pI, atomic composition, GRAVY and sequence-based A280 extinction coefficients.
- 02Technical source
Pep-Calc.com: peptide and peptoid properties and mass spectral peak assignment
Lear S, Cobb SL. Journal of Computer-Aided Molecular Design. 2016;30:271–277. A published peptide-property calculator and method reference.
Other tools
Continue the workflow
Peptide calculator
Concentration = mass ÷ final volume
Open →Identity & alias checker
name → reviewed identity record
Open →Peptide stock preparation
m = C × V × MW ÷ active fraction
Open →Your next step
Find a product. Ask about the details.
Browse catalog sizes, or contact us about product identity, document availability and a quotation. Your calculator inputs are not attached to your inquiry.