pepwiki/peptide-mw

Zero-dependency peptide molecular weight calculator

dev-main 2026-07-22 18:36 UTC

Requires

• php: >=8.1

Requires (Dev)

• phpunit/phpunit: ^10.0

MIT

Published on Packagist.org on 2026-07-22 21:48 UTC

README

Zero-dependency peptide molecular weight calculator for PHP. Uses monoisotopic residue masses for mass spectrometry accuracy.

Installation

composer require pepwiki/peptide-mw

Usage

<?php

require_once 'vendor/autoload.php';

use PeptideMw\PeptideCalculator;

// Calculate molecular weight
$mw = PeptideCalculator::calculateMolecularWeight('AGILM');
echo "MW: {$mw}\n"; // 593.32463

// Calculate molecular formula with Unicode subscripts
$formula = PeptideCalculator::calculateMolecularFormula('AGILM');
echo "Formula: {$formula}\n"; // C₂₃H₄₁N₅O₇S₁

Features

• Zero dependencies — No external packages required
• Monoisotopic masses — Accurate for mass spectrometry
• Case-insensitive — Accepts both "AGILM" and "agilm"
• Full type safety — PHP 8.1+ with strict types
• Unicode formulas — Beautiful subscript output

Amino Acid Masses

AA	Monoisotopic Mass	AA	Monoisotopic Mass
A	71.03711	M	131.04049
R	156.10111	F	147.06841
N	114.04293	P	97.05276
D	115.02694	S	87.03203
C	103.00919	T	101.04768
E	129.04259	W	186.07931
Q	128.05858	Y	163.06333
G	57.02146	V	99.06841
H	137.05891	I	113.08406
K	128.09496	L	113.08406

Resources

• WikiPept — Peptide database
• Kingston Peptides — Custom peptide synthesis

License

MIT