Browser extension
Peptide Calculator
Reconstitution and blend math with real syringe markings, one click from any tab.
The Peptide Calculator puts the same calculation engine as the Peptide Library app in your browser toolbar. Enter a vial strength, the diluent you added and the amount you are measuring, and it shows the volume to draw in milliliters and in units on the syringe you choose, with the nearest marking drawn to scale.
It is a calculator, not an advisor: it never suggests or grades an amount, and it only converts between IU and milligrams when you give the factor for that exact substance.
Coming soon to Chrome, Edge, Firefox, Opera and Safari
Account: No. An account (Pro) is only needed to sync saved calculations with the app.
What it does
Reconstitution, both ways
Amount → volume, or volume → amount: what a drawn volume holds after reconstitution, in mg, mcg or IU.
Syringe markings
0.3, 0.5 and 1 mL insulin syringes (U-100) and 1, 3 and 5 mL syringes. The draw is drawn on the real graduations and rounded only to a marking you can measure, with a warning when that changes the amount.
Blends
Up to eight components in one vial: draw for a combined amount, for one component, or see what a volume holds of each.
History and presets
Recent results are kept on your device; name and save the ones you reuse. Copy any result as text.
Optional sync
With a Pro account, saved calculations sync with the Peptide Library app, the same rows the app uses.
How it works
All math runs in the extension with exact decimal arithmetic, from the same shared engine the app and website use, so results match to the digit.
A peptide picked from the library only supplies its name and, when the profile states one, its IU-per-mg factor.
Privacy
- • Calculations stay in your browser unless you sign in and turn on sync.
- • No access to the pages you visit: the extension asks only for its own storage.
Full details: privacy policy · support
Browser support
| Browser | Needs | Get it |
|---|---|---|
| Google Chrome | Chrome 116 or later | Coming soon |
| Microsoft Edge | Edge 116 or later | Coming soon |
| Mozilla Firefox | Firefox 140 or later | Coming soon |
| Opera | Opera 102 or later | Coming soon |
| Safari | Safari 17 or later | Coming soon |
On peptidelibrary.app
- Peptide calculator on the website · The full calculator, with cost and cycle planning.
- Insulin syringe units converter · How units, mL and U-100 markings relate.
- Peptide Library · Research profiles for each compound.
Frequently asked questions
Does the calculator recommend a dose?
No. It only does the arithmetic for amounts you enter. It never suggests, rates or limits an amount, and it is not medical advice.
Can the calculator work in IU?
Yes, for vials and amounts stated in IU. It converts between IU and mg only with the IU-per-mg factor of that exact substance, from its Peptide Library profile, a label or a certificate. There is no universal conversion, and syringe units are not IU.
Which syringes does it support?
U-100 insulin syringes of 0.3, 0.5 and 1 mL (marked every 1 or 2 units) and 1, 3 and 5 mL syringes marked in mL.
Are the results the same as in the app?
Yes. The extension uses the same calculation engine as the Peptide Library app and website.
Where are my saved calculations kept?
On your device. If you have Pro and sign in, you can also save them to your account so they open in the app.
More Peptide Library extensions
Research and educational use only. Not medical advice. Peptide Library does not sell peptides.