Feature Deep-Dive
The only peptide reconstitution calculator that works both ways.
Every peptide tracker has a calculator. They all go in one direction: vial size plus BAC water plus target dose equals syringe units. Protocol adds the direction no other app has.
Enter the syringe units you want to draw. Get your dose. That is the reverse calculator.
Forward calc
Dose → draw units
Reverse calc
Draw units → dose
Compounds
81 with preset doses
The forward calculator
Enter your vial size, the volume of bacteriostatic water you added, and your target dose. Protocol returns the exact number of units to draw on a U-100 insulin syringe. It also shows your concentration in mg/mL, the number of doses remaining in the vial, and the dose as a percentage of the vial.
The concentration slider is where Protocol separates from every other calculator. Slide the BAC water volume up or down and all values update in real time: concentration, draw units, and doses per vial. Use it to find the BAC water volume that puts your draw in the 10 to 50 unit range on a standard syringe — the range where measurement accuracy is highest.
The reverse calculator — unique to Protocol
No competing peptide tracker app offers reverse calculation. The direction matters in two specific situations.
First: calibrating against a pre-loaded syringe. If you filled a syringe before calculating the exact dose — or if you are working from a syringe someone else prepared — enter the units in the barrel and Protocol tells you the dose. No estimation.
Second: optimizing draw volume. Some users work backward from a convenient draw amount (say, 20 units) and want to know what dose that delivers at their current concentration. The reverse calculator gives that answer directly. Adjust your BAC water with the slider to change the concentration, and the reverse result updates immediately.
Which apps have it?
Free web version
The full reconstitution calculator is available free at protocolapp.health with no account or app download required. It covers 81+ compounds with preset dose options. Use it on desktop before you reconstitute.
Open the free reconstitution calculator →FAQ
Does Protocol have a reconstitution calculator?+
Yes. Protocol's in-app reconstitution calculator covers 81 compounds and works in both directions. Forward mode: enter your vial size, BAC water volume, and target dose to get the exact syringe units to draw. Reverse mode: enter the number of syringe units you want to draw to find your dose. A concentration slider adjusts BAC water volume in real time and updates all values simultaneously.
What is a reverse reconstitution calculator?+
A reverse reconstitution calculator works backward from syringe units to dose amount. Standard calculators go forward: you enter your target dose and they tell you how many units to draw. A reverse calculator lets you start from a number of units — useful when you are calibrating against actual syringe marks or pre-loading syringes — and tells you the dose that number of units delivers at your current concentration. Protocol is the only peptide tracker app with this feature.
How does Protocol's concentration slider work?+
The concentration slider in Protocol's reconstitution calculator adjusts the BAC water volume in real time. As you move the slider, the display updates your concentration (mg/mL), draw units per dose, and doses per vial simultaneously. This lets you find the optimal BAC water volume for your vial size and dose target — one that keeps your draw in the 10 to 50 unit range on a standard U-100 insulin syringe.
Is the reconstitution calculator free?+
Yes. The in-app reconstitution calculator is free for all Protocol users. The web version at protocolapp.health/tools/reconstitution-calculator is also free with no account or app download required. It covers 81+ compounds with preset dose options and the concentration slider.
Which peptide tracker apps have a reconstitution calculator?+
Protocol has the most complete reconstitution calculator of any peptide tracker app, including the reverse calculator and concentration slider. PeptIQ has a basic calculator. DoseTrack includes a reconstitution calculator. PepTracker, Pep AI, LynkDose, and Shotlee do not. No other app offers the reverse calculation mode.
The calculator is free. The app is free to start.
14 days of Pro at install. No account required.
