The per-compound dosage calculators

How do these differ from the general converters?

Scope, not method: the three converters in the tools section are compound-agnostic and will take any vial, any water volume and either barrel scale. These three narrow to one molecule and carry its regulatory record on the same page.

What that adds: the tirzepatide page sits next to the Mounjaro single-dose presentations, the semaglutide page next to the Ozempic pen concentrations and the Wegovy presentations, and the BPC-157 page next to the fact that no approved label exists for it in the United States at all.

Why the absence is the useful part: knowing that a brand product runs at a fixed concentration is what makes a research vial's number comparable. Knowing that no such reference exists is the answer to a question people ask without realising it.

Why does a milligram figure need a calculator at all?

Because the two numbers involved measure different things. A vial label states mass, and a syringe barrel is marked in volume, so a figure in milligrams has no mark attached to it until water has been added.

Concentration is the whole bridge: once vial milligrams are divided by water milliliters, every mark on the barrel has a mass value, and not before. Two vials of the same compound mixed with different water volumes give the same amount at two different readings.

Which is why the charts fight: a conversion table posted without its vial size and its water volume is not portable, and the long version of that argument is worked out in the page on why two charts disagree.

What happens to the numbers typed into them?

Nothing leaves the browser tab. The arithmetic runs on the page, the result renders on the page, and none of it is sent anywhere or kept between visits.

Nothing is prefilled either: a prefilled field is a suggestion wearing a placeholder's clothes, so every input starts empty and the output stays blank until real numbers exist to work on.

And the result is arithmetic, not advice: a converter can tell you what a number becomes on a given scale. It cannot tell you whether that number belongs anywhere near a person, which is a clinician's call with your labs in front of them.

The three calculators

Same engine, three reference sets: each page runs the identical conversion and differs only in the regulatory record printed beside it.

Where this sits in the library

The general-purpose versions: the tools section holds the three compound-agnostic converters, including the one that solves the arithmetic backward from a chosen syringe mark.

The record behind each compound: the compound guides cover what named trials tested and what approved labels state, which is the material these pages quote from.

The full index: every page published so far is listed in the library, and the sourcing rules are on the methodology page.

Last reviewed: 27 July 2026.