Peptide dosage calculator
Select a peptide, choose the vial size and water amount, then add your prescribed dose to see the syringe units you need.
Use this for reference only. Your dose comes from your prescriber or the product label; we only convert it into units.
- Amount in 1 unit using a U-100 syringe
- amount of 0.01 mL
- per 100 units
- 1 mL
- per 1 mg
- an amount of 1,000 mcg
Our peptide dosage calculator shows the unit mark that matches your existing dose on an insulin syringe. Choose a peptide, set the vial milligrams and water milliliters, then add your dose in mg or mcg to see the syringe units. Your prescriber decides the dose; we never recommend one.
Peptide dosing calculator: how the math works
Behind the scenes, a peptide dosing calculator works through 3 short steps. The first step gives the strength in mg per mL by dividing the vial mg by the water mL; a 10 mg vial with 2 mL of water gives 5 mg per mL. Your dose in mg, divided by the strength, gives mL; for a U-100 syringe, multiply that amount by 100. Such a syringe has 100 units for every 1 mL.
A 0.5 mg dose at 5 mg per mL equals 0.1 mL of liquid, which comes to 10 units on your syringe. Our peptide dosing chart lists other common draws across vial strengths so you can compare.
Getting from the vial to the injection
Often, people search for a peptide injection calculator when they're ready to mix a vial and then draw their dose. Slowly push water down the inside wall, then roll the vial gently without shaking it. How to reconstitute peptides covers all the steps. Draw the syringe to your unit mark first, then inject under the skin of your belly or thigh. For site rotation, see our subq injection guide.
Peptides covered by the peptide dosage calculator
All the peptides in our selector follow the same concentration math. A few peptides have FDA-approved brand medicines. Tirzepatide is approved as Mounjaro and under the Zepbound label; semaglutide is approved as Wegovy and Ozempic. Egrifta SV is the approved brand for tesamorelin, while bremelanotide, also called PT-141, has approval as Vyleesi. Compounded vials and research chemicals, including BPC-157, TB-500, retatrutide, ipamorelin and CJC-1295, are not FDA-approved; we convert only the dose you enter.
Frequently asked questions
Will the calculator tell me which dose to take?
It only converts an existing dose into syringe units, so no. The dose is set by your prescriber or by your product label.
What if my dose is measured in mcg?
Type your number after choosing mcg as the dose unit; 1,000 mcg equals 1 mg. With a strength of 5 mg per mL, 100 mcg works out to 0.02 mL, or 2 units when you use a U-100 syringe.
Will it work with compounded tirzepatide?
Yes. For any vial, the volume math works once you supply the total mg and water mL. A tirzepatide dosage calculator for common tirzepatide vial strengths is also available from us.