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Microdosing Tirzepatide Calculator
People searching for a microdosing chart want a table of amounts to copy. This page will not give you one, because nobody honest can — there is no trial behind those tables. What it does instead is build the table from your own arithmetic: enter what is on your vial, how much water you mixed into it, and the weekly total you have already decided on with a clinician, and it shows that one total divided every way from one injection to seven, with the syringe reading for each. It never suggests the total, and it will never suggest one.
Before you split anything, three things about microdosing tirzepatide
- No trial has tested it. Every efficacy and safety figure published for tirzepatide — the SURMOUNT weight-loss program, the SURPASS diabetes program, the sleep-apnea trials — comes from once-weekly administration of a single injection. Splitting a week's amount into several smaller ones has not been tested in a registered trial, which means there is no result showing it works better, none showing it works the same, and none showing it is safe to do. The charts circulating online are extrapolation presented as data.
- The approved label is once weekly, and this page does not reproduce it. Tirzepatide has a real FDA label with real published dosages, which is exactly what separates it from the grey market. Those figures belong in context on the evidence page, not beside a calculator input, so they are not printed here. Read them where they can be read properly.
- Splitting assumes a vial, and a vial is usually compounded. A branded pen delivers one fixed amount and cannot be divided; every splitting chart therefore assumes a multi-dose vial drawn with an insulin syringe. What is in a compounded vial is not established by the trials above, which tested the manufacturer's product — so the strength you enter below is a number only your own label can give you.
Read the full Tirzepatide evidence page for the trial data and sourcing behind these facts.
This tool does not recommend a dose
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The total milligrams the label states the vial contains, before any water is added. This tool has no product database — the only place this number exists is your own label.
The diluent volume you actually put in. Change this and every unit figure below changes with it — which is exactly why no chart printed by someone else can be right for your vial.
The total for one week that you have already decided on with the clinician who prescribes it. Nothing here is suggested, and nothing is filled in — if you have not settled on a total, this tool has nothing to divide.
Enter all three numbers above — the vial's mass, the water you mixed, and your own weekly total, each greater than zero — and your split table appears here. There is no table until then, because there is no number in it that you did not supply.
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What this calculator does not tell you
It does not know that splitting works
It does not know your real concentration
It does not know whether a quantity is appropriate
It does not verify sterility, purity, or legality
The arithmetic
How the math works
Three numbers go in, and the third is the only one that carries a quantity: the mass on your vial (mg), the water you mixed into it (mL), and the weekly total you have already settled on (mg).
Concentration = vial strength (mg) ÷ water added (mL). This is the same first step as every other calculator on this site, and it is the reason no chart written by a stranger can be right for your vial.
Each row of the table = your weekly total ÷ the number of injections in that row, then converted to millilitres at your concentration and to units at 100 units per millilitre. Seven rows, one input, seven divisions.
Weeks per vial = the vial's labelled mass ÷ your weekly total, rounded down — a partial week is not a week of supply.
Glossary
Key terms
- Splitting (“microdosing”)
- Dividing a total that would otherwise be given as one injection into several smaller ones. A description of a practice, not an endorsement of it — no trial has tested it for this compound.
- Concentration (mg/mL)
- How much peptide sits in each millilitre of the mixed solution — the exchange rate between a mass and a volume.
- Syringe units (U-100)
- The markings on a standard U-100 insulin syringe, where 100 units equal 1 millilitre. A different syringe, such as a U-40, uses a different scale entirely.
- Vial strength
- The total mass of peptide printed on the vial's label, in milligrams — before any water is added.
- Weeks per vial
- How many whole weeks a vial's labelled contents cover at the weekly total you entered. Rounded down, because a partial week is not a week of supply.
Questions
Frequently asked questions
What is the correct amount to microdose tirzepatide?
This calculator does not answer that, and no page that has read the literature can. There is no trial of split-dose tirzepatide to derive a figure from, so any chart offering one is extrapolating from once-weekly trial data and presenting the result as though it were measured. The tool takes a weekly total you have already settled with the clinician who prescribes it, and shows you the arithmetic of dividing that total. It has no total of its own to offer.
Why does splitting a weekly total across several injections change anything?
Because the amount in your blood over a week is not flat, and how you administer a total changes its shape. A single weekly injection produces one peak that falls away over the following days; several smaller injections produce several smaller peaks. Those are different exposure patterns from the same total milligrams, and the published trials measured only the first one. That is the honest answer to what changes: the pattern is different, and it has not been studied.
Is this the microdosing chart I was looking for?
Not in the form most sites publish it. A chart with amounts already printed in it is telling you what to take, and this site does not do that. The table this tool produces is your own single number divided seven different ways — one injection, two, three, up to seven — so you can see what each split works out to in milligrams and in syringe units at the concentration you actually mixed. No row is marked, ordered, or preferred over another. Enter nothing and there is no table.
How do I know how much is in my vial?
From the vial's own label, and nowhere else. This tool has no database of products and cannot look up a strength for you — the milligram figure you enter is read off the label in front of you. If a vial is unlabeled, or the label does not state a peptide mass, there is no number to enter and no arithmetic to do.
Does the split table say a smaller, more frequent injection is better?
No. Every row in that table is the same weekly total, cut a different number of ways, and the rows are printed in numerical order for legibility rather than in any order of preference. The tool has no view on which row is right, states no view, and marks no row. It divides a number you supplied.
Medical disclaimer: This content is for general educational purposes only and is not medical advice, diagnosis, or treatment. Always consult a licensed healthcare professional before starting, stopping, or changing any treatment.