How PepFormula Works
The exact formulas, the assumptions behind them, and the standards every page is held to. If a result on this site can be wrong, we say where.
The three formulas
Every calculator on this site reduces to the same three steps of arithmetic, identical to what a compounding reference would use. Nothing is hidden behind the interface.
1. Concentration
Example: a 5 mg vial mixed with 2 ml of bacteriostatic water gives 5,000 ÷ 2 = 2,500 mcg/ml.
2. Injection volume
Example: a 250 mcg dose at 2,500 mcg/ml needs 250 ÷ 2,500 = 0.1 ml.
3. Syringe units
Example: 0.1 ml on a U-100 (1 ml) insulin syringe = 10 units on the scale.
What the calculators assume
The arithmetic is exact — the same inputs always produce the same output. But real-world accuracy depends on things outside the calculator, and it is more honest to list them than to claim precision:
- Vial content varies within manufacturing tolerance. A vial labeled 5 mg may contain slightly more or less. The calculator trusts the label, because that is all a buyer can act on.
- BAC water volume is assumed to be exactly what you drew. A 1 ml syringe read carelessly changes the concentration, and every downstream number moves with it.
- Syringe readings are taken at the bottom edge of the plunger, at eye level. Parallax and reading from the top edge are the two most common measurement errors.
- Reconstituted peptides degrade. The common guidance is to use refrigerated solutions within about 28 days. No calculator on this site models degradation.
- Reconstitution practice varies. Some compounds and protocols use volumes or diluents that differ from the defaults here; the calculators let you enter your own numbers rather than assuming ours.
- This site does arithmetic only. It does not recommend doses, prescribe, or advise. What a given dose should be is a question for a healthcare professional and official sources.
Editorial policy
- Authorship. PepFormula is built and maintained by Kanika, an independent developer — not a medical professional, and the site says so everywhere it matters.
- Scope. Guides cover the mechanics of reconstitution and measurement. Dose protocols and "how much should I take" content is deliberately out of scope.
- Sourcing. Every clinical number on the site links to its official source: FDA prescribing information (accessdata.fda.gov), peer-reviewed trials (NEJM, PubMed), or official public-health guidance.
- Independence. The site is funded by display advertising (Google AdSense). No sponsored content, and no payment influences calculation results or editorial positions.
- AI disclosure. Drafting tools may assist with structure and phrasing; every page is reviewed, verified against sources, and signed off by the author before publishing.
Review & corrections
Calculator pages carry a Last Reviewed date — that line means the formulas, worked examples, and source links on that page were personally re-checked by Kanika as of that date. Guides list their sources at the bottom so you can verify claims yourself.
Errors reported through the contact page are checked against the formulas and sources above. When a material error is corrected, the page notes the correction and the review date is updated. Calculation errors are treated as the highest priority.
Sources we rely on
- FDA Drug Approval & Labeling database — prescribing information for every approved medication referenced on the site
- PubMed / NEJM — peer-reviewed trials for clinical numbers
- Official public-health guidance (e.g. NHS, ACOG) where relevant