Peptide calculators
Free tools that do the arithmetic between a vial, the water you add, and the marks on an insulin syringe. They never suggest a dose. They show where the dose you were given falls on the syringe.
Reconstitution calculator
U-100 syringeAll calculators
- Reconstitution calculatorVial mg + water mL + dose = units on the syringe, plus doses per vial.Open
- mg/mL to units converter1 mL is 100 units. Convert volume or a dose at a known concentration.Open
- Tirzepatide units calculatorEvery label dose from 2.5 to 15 mg in units at your vial concentration.Open
- Retatrutide dosage calculatorTrial doses converted to syringe units. Investigational drug; arithmetic only.Open
- Tesamorelin units calculatorEgrifta WR and SV label doses as mL and units, or any vial. FDA-approved drug; arithmetic only.Open
- Dose and injection-site trackerPrintable weekly or daily log with a site-rotation diagram. Filled by hand; nothing stored.Open
- Printable dosing chartOne sheet of units for every common dose at your vial and water amount.Open
The two numbers every calculator needs
The concentration, in mg per mL. On a compounded vial it is printed on the label. For a powder you mix yourself, it is the vial amount divided by the water you add.
The dose, from your prescriber or the product label. For approved drugs, every label dose is listed on the drug's page in the GLP-1 section. Peptides that are not approved have no human dosing standard, and the profiles say so rather than inventing one.
With both in hand, the rest is division, because 100 units equals 1 mL on any U-100 insulin syringe.
Which calculator do you need?
- A powder vial you mix yourself: the reconstitution calculator, which takes the vial, the water and the dose and gives the units to draw.
- A liquid vial, or a plain mL question: the mg/mL to units converter.
- Compounded tirzepatide: the tirzepatide units calculator, which lists every label dose at your concentration.
- Egrifta: the tesamorelin calculator, with presets for both formulations.
- Retatrutide: the retatrutide calculator converts doses used in trials. The drug is investigational and has no prescription route.
- Something for the cabinet: the printable dosing chart and the dose and site tracker.
A single-dose pen needs none of these. It delivers its full dose with one press, so there is nothing to convert.
Three checks before you trust a result
- Is it a U-100 syringe? Every tool here assumes one. A syringe marked for anything else gives a wrong dose.
- Mg or mcg? 1 mg is 1,000 mcg, and mixing them up is the easiest large error to make.
- Is this the vial you are holding? Units belong to one concentration. A refill at a different strength changes the number even though your dose did not.
A calculator also cannot check what is in the vial. Products sold "for research use only" are not legal to use on people, and the math assumes a label you can trust. The reconstitution guide covers the hands-on part, and the injection sites guide covers where the dose goes.