Interactive research tool
LC–MS Peptide m/z Calculator
Calculations run locally in your browser. Inputs are not submitted or stored by this tool.
The neutral monoisotopic mass and theoretical ion equations will appear here.
| Charge | [M+nH]n+ | [M+(n−1)H+Na]n+ | [M+(n−1)H+K]n+ | [M−nH]n− |
|---|
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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
IUPAC definition of mass-to-charge ratio
IUPAC Gold Book. Definition and notation for the dimensionless mass-to-charge quantity m/z in mass spectrometry.
- 02Technical source
PeptideMass documentation
SIB ExPASy. Reference implementation context for peptide masses, charge states, cleavage rules and selected modifications.
Other tools
Continue the workflow
Peptide calculator
Concentration = mass ÷ final volume
Open →Peptide sequence analyzer
sequence → composition, mass, pI & charge
Open →Identity & alias checker
name → reviewed identity record
Open →Your next step
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