Enter a half-life and, optionally, a starting amount you have already logged. The calculator shows how that amount falls by half over each successive half-life, as a curve and a table. Everything is arithmetic on your inputs.
| Half-lives elapsed | Time elapsed | % remaining |
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Enter a half-life to draw the curve.
After one half-life, half of the starting value remains; after two, a quarter; after three, an eighth, and so on. Formally the fraction remaining after time t is 0.5(t ÷ half-life). That is the whole model — a clean exponential halving. It is a useful way to picture why a long half-life makes successive inputs overlap rather than clear between them, and why a short one does the opposite.
What it is not is a readout of what is in your body. Absorption and elimination in a real person are shaped by many factors this page cannot see, and individual variation is large. Treat the curve as a drawing of your own numbers, nothing more.
Use a half-life reported in a published human pharmacokinetic study for the compound you are tracking. Our compound reference pages list a half-life only where a fetched human study reports one, and state plainly when no reliable human half-life has been published — in which case there is simply no trustworthy number to enter here. Once you have a value, the peptide tracker app can store it alongside your log, and the reconstitution calculator handles the separate question of what volume to draw.
It takes a half-life and a starting amount that you type in, and plots how that amount halves over successive half-lives. It is pure arithmetic on your own numbers. It does not know any compound, it has no built-in half-lives, and it is not a model of what happens in your body.
No. Real pharmacokinetics depend on absorption, distribution, metabolism and individual variation, none of which this page knows. The curve here is a simple exponential-decay illustration of the numbers you entered, not a prediction of a concentration in anyone's body, and it is not dosing advice.
From a published human pharmacokinetic study for the compound, if one exists. Our compound reference pages list a half-life only where a fetched human study reports one, and say so plainly when none is published. This page supplies no half-life of its own.
Not medical advice. Pepti is a record-keeping and measurement tool, not a medical device. This calculator provides no dose, no schedule, and no compound-specific figures.
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