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Lab tools

Free calculators for everyday peptide bench work. They run in your browser; nothing you enter is stored.

Peptide molecular weight calculator
Sequence in one-letter code → molecular formula, average and monoisotopic mass, composition.
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Molarity & dilution calculator
Solve for concentration, mass or volume from molecular weight, and plan C1V1 = C2V2 dilutions.
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Free Peptide Lab Tools — Molecular Weight & Molarity Calculators | Neupeptides