Calculator
Units to mg converter
Two-way conversion between syringe units and milligrams, for any vial, water amount, and U-100 or U-40 scale typed in.
Open the toolDose math
Peptide dose math, worked out
This section is where we do the arithmetic out loud: units, milligrams, concentrations, syringe scales, and reconstitution. Every page in it exists because of the same recurring forum event, a syringe photo and a unit count with the vial missing from the story. Below: three calculators, eight explainers, ten compound guides, and the standard we hold all of them to.
Short answer
What this section is: dose math is the arithmetic that joins a vial label to a syringe reading, and this hub is where we collect every page we have built on it.
The pieces: a unit is a volume mark on the barrel, 0.01mL on a U-100 and 0.025mL on a U-40; a milligram is mass, 1,000mcg apiece; concentration, vial milligrams divided by water milliliters, is the bridge between them.
What we publish here: three calculators that run the conversions in the browser, eight explainers that each take one confusion apart, and ten compound guides that set the same math next to the trial record.
What we will not do: pick a dose for anyone. The tools convert whatever numbers get typed in, and the right figure for a body is a clinician's call, not ours.
On this page
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 the most common dose-math error we see quoted.
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.
The tools
Three calculators, no opinions: each one runs in the browser, stores nothing, and returns whatever the arithmetic supports for the numbers typed into it.
Calculator
Reconstitution calculator
Vial size plus water volume to concentration, or a target concentration back to the water needed.
Open the toolCalculator
Bac water calculator
A vial, a dose to measure, and a target syringe mark in, the bacteriostatic water volume out.
Open the toolThe 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.
Explainer
Concentration vs dose
Dose is a mass, concentration is a mass per volume, and confusing the two is the root of most wrong unit counts we untangle.
Read the explainerExplainer
mcg vs mg
A microgram is a thousandth of a milligram; why the two get swapped in posts, and what the swap costs on paper.
Read the explainerExplainer
What is a unit
A unit is a fixed fraction of a milliliter printed on the barrel. Where that mark came from, and what it cannot tell you.
Read the explainerExplainer
U-100 vs U-40
Two syringe scales with two different volumes per mark, and the 2.5x error that comes from reading one as the other.
Read the explainerExplainer
Bac water volume
Same vial, different water: how the reconstitution choice rewrites every unit count downstream of it.
Read the explainerExplainer
Storage after reconstitution
What labels and papers say about a mixed vial's shelf life, and which posted numbers have a source behind them.
Read the explainerExplainer
Why charts disagree
Every conversion chart smuggles in its own vial, water, and syringe assumptions; match all three and the charts agree.
Read the explainerExplainer
Blend vials
One vial, several peptides: the per-unit math runs once per component, and keeping those components straight is the whole job.
Read the explainerThe Decadewise briefing
One calculator, one explainer, or one worked example from this section, every week. Free.
Education only. Unsubscribe anytime.
The compound guides
Ten compounds, one format: each guide pairs the trial record and the reported use with the same units math this section teaches, compound by compound.
Rich human data
Tirzepatide
SURMOUNT and SURPASS doses, the label schedule, and the research-vial units problem in one reference.
Read the guideRich human data
Semaglutide
STEP and SUSTAIN doses, the pen strengths, and the escalation schedule behind the posts.
Read the guideRich human data
Tesamorelin
Two phase 3 trials, a daily rhythm instead of a weekly one, and one narrow approved indication.
Read the guideLimited human data
CJC-1295
A real but small early human record, a stopped development program, and what the community reports running.
Read the guideLimited human data
Ipamorelin
The selectivity paper, early PK work, and a phase 2 trial that missed its endpoint.
Read the guideResearch only
TB-500
The human record belongs to the parent molecule; the guide says so, then works the vial math people ask about.
Read the guideResearch only
BPC-157
No completed randomized human trials, a large rodent record, and the units questions people ask anyway.
Read the guideResearch only
MOTS-c
A mitochondrial peptide with a discovery paper, human exercise data, and the worked vial example the site was built around.
Read the guideResearch only
GHK-Cu
The studied lane is topical; the injectable lane has no human trials, and the guide treats that gap as the headline.
Read the guideBlend decode
KLOW
No trials on the blend itself; the guide decodes the four components and reconciles the two reconstitution camps.
Read the guideThe 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 page here carries its own source pack, the papers, labels, and registry entries behind its figures. The DOIs and PubMed IDs sit at the bottom of each page so the numbers can be verified against their originals.
Last reviewed: 20 July 2026.
The disclaimer
Every page is reviewed by medical professionals before it ships, and written with longtime biohackers who were doing this before it was a trend. Reviewed still does not mean prescribed: nothing here is medical advice.
It is research, trial data, and reported use, with the numbers intact so you can check them. For decisions about your body, see a doctor who can look at your labs.
The weekly briefing
Get the next dose-math page.
New calculators, new explainers, and the arithmetic behind the next confusing syringe photo. One clear email a week.
Education only, never medical advice. Unsubscribe anytime.