---
title: "Peptide.Express (@peptideexpress) | Hashnode"
description: "Open peptide mass reference data and tools. For laboratory research use only. Not for human or veterinary use."
url: "https://hashnode.com/@peptideexpress"
---

@peptideexpress

# Peptide.Express

@peptideexpress · Joined October 2026

[Website](https://peptide.express/)

### [Building a Peptide Monoisotopic and Average Mass Calculator in Python](https://peptideexpress.hashnode.dev/building-a-peptide-monoisotopic-and-average-mass-calculator-in-python?utm_source=hashnode&utm_medium=feed)

Compute peptide monoisotopic mass, average mass and ESI m/z from first principles in Python, then cross-check against the open-source peptide-mass package.

7 min read · [peptideexpress.hashnode.dev](https://peptideexpress.hashnode.dev/building-a-peptide-monoisotopic-and-average-mass-calculator-in-python?utm_source=hashnode&utm_medium=feed)

[Oct 15](https://hashnode.com/posts/building-a-peptide-monoisotopic-and-average-mass-calculator-in-python/6ad0a993b39eac34f101a4ff)