Peptide Tools

Peptide and Molarity Calculator

Calculate peptide mass, isoelectric point, net charge, hydrophilicity and molarity in one place.

Input Your Sequence

N-Terminus C-Terminus Mass Type Counterion pH

1-Letter Code

Number of Residues

3-Letter Code

Molecular Mass (Mr)

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Average Hydrophilicity

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Isoelectric Point

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Hydrophilic Residues / Total

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Net Charge at pH 7.0

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Counterion

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Salt-Adjusted Mass

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Hydrophilicity

Note: Mass = sum of residues + H₂O, N/C caps adjusted. pI/charge via Henderson–Hasselbalch (approx.). Hydrophilicity according to Hopp–Woods. Salt mass: 1 counterion per positive charge.

Molarity Calculator

Molecular Mass (g/mol) Inputs: MW, volume, concentration. Output: Mass (auto units).

Volume

Concentration

Required Mass

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