Peptide Vial Math

About Peptide Vial Math

Peptide Vial Math is a set of free, accessible calculators for one job: turning "mg in a vial" and "mL of water" into exact concentrations, volumes and syringe readings.

By Peptide Vial Math Editorial Team Reviewed by the team on (how we review) Updated Formulas unit-tested (methodology)

Why it exists

Reconstitution math is simple, but errors are easy to make and costly: mg vs mcg is a 1,000× error, units vs mL a 100× one. FDA has documented people drawing 50 units instead of 5. We wanted a tool that shows every intermediate number, warns when a reading can't be measured cleanly, and states its answer in one plain sentence you can check by hand.

Peptide Vial Math Editorial Team

Every page on Peptide Vial Math is written and reviewed by the Peptide Vial Math Editorial Team, and is credited to the team rather than to individuals. We don't attach personal names or professional credentials to pages, and we don't present the site as medical advice. What we can show you instead is the work: every factual claim about a compound, a diluent or a regulation links to a primary source (FDA, DailyMed, CDC, ClinicalTrials.gov, PubMed or PubChem), and every number comes from one tested code module.

How a page is reviewed, step by step, is documented on the methodology page. Each page shows the date it was last reviewed.

What we'll never publish

  • Dosing recommendations, schedules or "protocols".
  • Seller rankings, scores, star ratings or buy links.
  • Testimonials, invented experts or unverifiable statistics.

Picture credits

The pictures on Peptide Vial Math are historical laboratory plates and museum photographs of graduated glassware and early syringes, chosen because they show the same problem the calculators solve: reading a volume off a scale. They are not our products and show no product sold today. Each one is converted to the site's graphite tone and cropped to remove printed figure labels. The modern photographs (unlabeled vials, a syringe, a meniscus) are generated images made for Peptide Vial Math: they show no real product, brand, label or person.

  • Engraving of a stoppered graduated bottle marked 100 to 1000 and a graduated cylinder marked 10 to 100
    Graduated chemical glassware, Alessandri 1895, fig. 1. Public domain.
    Alessandri (1895), scan by valeg96 via Wikimedia Commons.
  • Engraving of glass burettes, one with a dark strip behind its graduation to make the tick marks easier to read
    Burettes, Alessandri 1895, figs. 12 and 13. Public domain.
    Alessandri (1895), scan by valeg96 via Wikimedia Commons.
  • Engraving showing a black-and-white card held behind a burette so the curved liquid surface can be read against the scale
    Reading the meniscus, Alessandri 1895, figs. 14 and 15. Public domain.
    Alessandri (1895), scan by valeg96 via Wikimedia Commons.
  • Engraving of two Mohr burettes on stands, one closed with a brass pinch clip and one with a glass stopcock
    Mohr burette, Alessandri 1895, figs. 9 and 10. Public domain.
    Alessandri (1895), scan by valeg96 via Wikimedia Commons.
  • Photograph of a glass and metal hypodermic syringe from the 1850s with its needle attached
    Hypodermic syringe, England, 1855–1865. CC BY 4.0.
    Wellcome Collection (L0057801) via Wikimedia Commons.
  • Photograph of an early glass hypodermic syringe with a tapered metal tip, belonging to Dr. Alexander Wood, with its printed caption cropped away
    Hypodermic syringe of Dr Alexander Wood (Wellcome M0009706). CC BY 4.0.
    Wellcome Collection (M0009706) via Wikimedia Commons.
  • Unlabeled clear glass vial with a gray stopper next to an empty insulin-style syringe on a dark graphite surface
    Unlabeled vial and syringe. Generated image made for Peptide Vial Math.
    Generated image made for Peptide Vial Math.
  • Close-up of clear liquid inside a glass tube, showing the curved surface (meniscus) where liquid meets air
    A meniscus, close up. Generated image made for Peptide Vial Math.
    Generated image made for Peptide Vial Math.
  • Three unlabeled glass vials on dark slate: one holding white freeze-dried powder, one clear liquid and one empty
    Powder, solution, empty vial. Generated image made for Peptide Vial Math.
    Generated image made for Peptide Vial Math.
  • An unlabeled clear glass vial standing on frost and ice crystals in a dark freezer
    A vial in cold storage. Generated image made for Peptide Vial Math.
    Generated image made for Peptide Vial Math.
  • A drop of clear liquid falling from a glass dropper into an open vial of white powder
    Adding diluent to a freeze-dried powder. Generated image made for Peptide Vial Math.
    Generated image made for Peptide Vial Math.

Corrections

If you find an error in a formula, a table or a fact, email corrections@peptidevialmath.com. We fix confirmed errors promptly and update the page's "updated" date.

Peptide Vial Math is published at peptidevialmath.com. General email: hello@peptidevialmath.com (all addresses on the contact page).

Ownership and funding: disclosures. Limits of the tool: disclaimer.