Dosage calculator
Enter desired dose, vial amount, and reconstitution volume to estimate mL to draw and syringe units.
Simple peptide math without the spreadsheet.
Peptide Calculator helps with common peptide calculations: desired dose, peptide amount, reconstitution volume, mL to draw, and syringe units for U-100, U-50, and U-40 syringes.
Peptide dosage calculator
Peptide reconstitution calculator
Syringe units calculator
Free peptide calculator app
Built for the numbers people actually check.
Calculate dose volume, scan vial labels, track inventory, log doses, rotate injection sites, and keep a simple history from your phone.
Reconstitution calculator
Keep peptide concentration, vial volume, and remaining doses organized in a simple mobile workflow.
Dose log
Record dose, volume, syringe type, and injection site so your history is easier to review.
Here’s what our users say.
Real reviews from the App Store.
Tried others, this one is actually good
“Recently started peptides and was honestly pretty confused with all the dosing math. Tried a bunch of calculators before this one. None of them were this easy.”
Simple. To the point.
“Excellent app, just what I needed. No jargon, just open it and get to pinning my GLP.”
Replaced my spreadsheet
“Punch in the vial, the water, and your dose and it just tells you the units to draw. Tracks what’s left in the vial too. Exactly what it should be.”
Peptide dosage guides.
Free, plain-English walkthroughs of the math behind the calculator — how to reconstitute a vial, find the volume to draw, and read your syringe.
How to Calculate Peptide Dosage
The formula for turning a desired dose into the exact volume to draw, with worked examples.
How to Reconstitute a Peptide
Step-by-step mixing with bacteriostatic water and how it sets your concentration.
Syringe Units Explained
What U-100, U-50, and U-40 mean and how to convert milliliters to syringe units.
Peptide calculator questions.
How do you calculate a peptide dose?
First find the concentration: divide the peptide amount in the vial (mg) by the reconstitution (BAC water) volume in mL to get mg/mL. Then divide your desired dose (mg) by that concentration to get the volume to draw in mL. Multiply the mL by 100 to read the units on a U-100 insulin syringe.
How do you reconstitute a peptide?
Add a measured volume of bacteriostatic water to the peptide vial. The amount of water you add sets the concentration: more water means a lower concentration and a larger volume to draw per dose, while less water means a higher concentration and a smaller draw. Enter the peptide amount and the water volume into the calculator above to see the resulting dose math.
How many units should I draw on a U-100 syringe?
On a U-100 insulin syringe, 1 mL equals 100 units, so multiply the volume to draw (in mL) by 100. For example, 0.25 mL is 25 units. A U-40 syringe reads 40 units per mL instead.
What is the difference between U-100, U-50, and U-40 syringes?
Each syringe type is marked at a different number of units per mL: U-100 reads 100 units per mL, U-50 reads 50 units per mL, and U-40 reads 40 units per mL. The same volume to draw therefore shows a different unit count on each, so always match the calculator's syringe setting to the syringe you actually use.
Is the peptide calculator free?
Yes. The peptide dosage and reconstitution calculator on this page is free to use, and the Peptide Calculator iPhone app is a free download on the App Store. Enhanced features — the AI coach, vial inventory, and dose tracking — are part of a paid subscription, which you can try with a free trial.
Is this medical advice?
No. Peptide Calculator is for calculation and organization only and is not medical advice. Always consult a qualified clinician before starting, changing, or stopping any peptide protocol.
Try it free
Run the dosage math yourself.
A free taste of the app's calculator: enter your dose, the peptide amount in the vial, and your reconstitution volume to get the exact mL to draw and your syringe units. The full app adds reconstitution, inventory, logging, and vial scanning.
mL
Syringe
Volume to draw
0.1 mL
Exact 0.1 mL
Units · U-100
10
For calculation and organization only — not medical advice. Always confirm doses with a qualified clinician.
Download Peptide Calculator for iPhone.
A free peptide calculator app for dosage math, reconstitution, syringe units, vial inventory, and dose logging.
Open App StorePeptide Calculator is for calculation and organization only. It is not medical advice. Always consult a qualified clinician before starting, changing, or stopping any peptide protocol.