COA tools

Peptide content & purity calculator

Read a Certificate of Analysis in plain numbers. Enter a lot's label fill, assay purity and reported peptide content to see the purity-adjusted net peptide mass. Select a compound to prefill values from its COA on file.

What this is not. This tool interprets analytical data for in-vitro laboratory research. It does not calculate a dose, a reconstitution volume, or any amount for human or animal use, and it returns no syringe or injection figure.

mg
%
mg
%
%
net peptide (purity-adjusted) = content(mg) × purity(%)
if no content on the COA: label(mg) × purity(%)
—
Purity-adjusted net peptide (mg)
Label fill—
Assay purity—
Reported content (COA)—
Water content—
Acetate / counter-ion—
Enter values or select a compound to read its COA.

Why two numbers differ. Assay purity is the percentage of target compound among related substances. Net peptide content is the actual peptide mass in the vial after water and counter-ions are accounted for. A vial can be high purity and still hold less net peptide than the label weight — which is why the COA reports both.

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