HowMuchPep is a free, independent peptide reconstitution calculator. It exists because the math between a powder vial, a vial of bacteriostatic water, and an insulin syringe trips people up constantly, and the consequences of getting it wrong are injected, not just written down.
The tool does one job: you tell it what is in your vial and what dose you intend, and it tells you how much water to add and where to pull the syringe. Every result displays the complete chain of arithmetic that produced it, because a number you can verify beats a number you have to trust.
What this site is not
This site does not sell peptides, does not recommend doses, does not endorse any vendor, and does not provide medical advice. The per-peptide pages describe regulatory status and publicly documented facts so you know what you are dealing with, and where communities discuss typical numbers, the pages say exactly that: discussed, never recommended.
Accuracy
The calculator uses the standard dilution equations used by compounding references: concentration equals total peptide divided by diluent volume, and a U-100 insulin syringe holds 100 units per mL. The reconstitution charts on peptide pages are generated by the same code that runs the calculator, so the chart and the tool can never disagree. If you find an error, please report it; corrections ship fast here.