Peptide dosage calculator and dose math index

Which peptide dosage calculator do I need?

Whichever one starts from the number already known, because those three solve the same division and differ only in which term is missing.

The same job under several names: peptide dosing calculator, peptide reconstitution calculator, pep calculator, pepcalc. Four labels for one question, and the answer to all four is the division above, run in whichever direction the missing number sits.

Compound-specific instead: the three converters above take any vial and know nothing about what is in it. The per-compound calculators narrow to one molecule and print its own label record beside the result, and the tools section is the longer version of the chooser above.

Why does the same unit count mean different milligrams?

Because a unit count is only a volume reading, and the milligrams inside that volume come entirely from the concentration of the liquid being measured.

The same mark, two answers: at 8mg per mL, a 40-unit draw on a U-100 syringe holds 3.2mg; at 2mg per mL, the identical mark holds 0.8mg.

Where to run it: the units to mg converter handles any combination of vial, water, and syringe, and the concentration vs dose explainer is the long version of why the bridge works that way.

Is a unit the same thing as a microgram?

No: a unit is a volume reading off the syringe barrel, a microgram is a unit of mass, and treating the two as interchangeable is a category error rather than a rounding one.

The two scales: one unit on a U-100 barrel is 1/100th of a milliliter, and one microgram is 1/1,000th of a milligram. Only concentration connects them.

Where to read more: the what is a unit and mcg vs mg explainers take each side of that pair apart.

How much bacteriostatic water does a 5mg or 10mg vial take?

There is no fixed answer, because the water volume is a choice rather than a property of the vial. What the choice settles is the concentration, and through it what every mark on the barrel carries.

Read the last column, not the third: the two 10mg rows show the same vial landing at 0.1mg and 0.05mg per unit purely on the water figure, which is why a chart with no water volume printed on it cannot be carried between vials.

The liquid itself: the other half of the phrase people search for is the reconstitution solution, and what is in the syringe changes the storage answer far more than the arithmetic. What bacteriostatic water is covers the preservative and the label, and the reconstitution calculator runs the same division on any figures typed into it.

The tools

Four calculators, no opinions: each one runs in the browser, stores nothing, and returns whatever the arithmetic supports for the numbers typed into it.

The explainers

Eight pages, one confusion each: every explainer takes a single mix-up from the posts we read, defines its terms once, and shows the arithmetic behind it.

The compound guides

Ten compounds, one format: each guide pairs whatever record exists with the same units math this section teaches, compound by compound. Every evidence claim and every figure lives on the guide that prints it, next to the source it came from, which is why this index says what each one covers rather than restating its findings.

The standard

The methodology: the sourcing and verification rules every page in this section follows are published on the methodology page, including how corrections to any figure land.

The source register: every figure taken from a paper, a label, or a registry entry is cited on the page that prints it, with its DOI or PubMed ID at the bottom so the number can be checked against its original. Pages that are pure arithmetic carry no source list and say so on their face, because a definition and a division have nothing to cite.

Last reviewed: 28 July 2026.