Peptide reconstitution calculator
Enter what is in the vial and the dose you want. You get the concentration, the volume to draw and the exact mark to fill an insulin syringe to. It runs in your browser and nothing is sent anywhere.
That dose is larger than the whole vial.
Results update as you type. This is arithmetic on your inputs — not medical advice.
Now let something else remember it
The arithmetic is the easy part. What goes wrong over a cycle is losing track: which vial, which day, how much is left, when it expires.
- Saves this vial and its concentration, so you never work it out twice
- Reminds you only on dose days, on and off cycles included
- Logs every dose and warns you before the vial runs out
Free to use. No account, and every record stays on your phone.
How the numbers are worked out
Three steps, with no rounding until the end.
- Concentration = peptide in the vial ÷ water added
- Volume per dose = dose ÷ concentration
- Syringe units = volume × marks per millilitre
A worked example
A 5 mg vial with 2 mL of bacteriostatic water gives 2.5 mg/mL. A 250 mcg dose is 0.25 mg, so the volume is 0.1 mL, which is 10 units on a U-100 syringe. That vial holds 20 whole doses of that size.
Common questions
How much bacteriostatic water should I add?
Any amount works, because the water sets the concentration rather than the total peptide. More water gives a larger, easier-to-read draw; less gives a smaller one. Pick an amount that puts your dose on an easy mark, then keep it the same for that vial.
How many units is my dose?
Units are marks on the syringe barrel, not an amount of peptide. On a U-100 syringe, 100 units is 1 mL. The calculator turns your dose into the mark to fill to.
Does this store anything?
No. It runs entirely in your browser. Nothing is sent to a server and nothing is saved.