Peptide Calculator App
You don’t need to install anything: this calculator runs in any phone browser and can be added to your Home Screen. If you want saved calculations and tracking, Peptide Library’s Android app and website include calculators. The Peptide Library iPhone app does not.
Peptide Calculator App
The total printed on the vial.
Bacteriostatic water or other diluent, in mL.
The calculator never suggests an amount.
Used to round to the nearest marking you can actually read.
Enter the vial amount, the liquid added and your target amount.
Arithmetic only: it never suggests or assesses an amount. Nothing you type leaves your browser.
Web calculator vs apps
| This site | Peptide Library website | Peptide Library Android | Peptide Library iPhone | |
|---|---|---|---|---|
| Reconstitution and blend math | Yes | Yes | Yes | No calculator |
| U-100 syringe units | Yes | Yes | Yes | — |
| Account needed | No | For saving | For saving | — |
| Save calculations | Share link | Yes | Yes | — |
| Schedules, logs, inventory | No | Yes | Yes | Yes |
| Price | Free | Free, optional Pro | Free, optional Pro | Free, optional Pro |
The Peptide Library iPhone app has no calculator. On iPhone, use this site in Safari (it works like an app from the Home Screen) and track in the iPhone app.
Use it like an app
- iPhone and iPad: open this site in Safari, tap Share, then Add to Home Screen.
- Android: open it in Chrome, tap the ⋮ menu, then Add to Home screen or Install.
- Desktop: bookmark it; it works the same in any modern browser.
Once the page has loaded, every calculation runs on your device, so results keep updating even on a weak connection.
What to look for in a calculator app
- Exact decimal math and visible working, so you can check the answer by hand.
- Real syringe sizes and rounding to readable markings, not just a raw number of mL.
- Per-component results for blends.
- No IU conversion without a stated factor, and no confusing syringe units with IU.
- No suggested amounts presented as defaults.
Peptide Library keeps a side-by-side comparison of peptide calculators that applies these criteria to named apps and sites.
Frequently asked questions
Is there a free peptide calculator app?
This web calculator is free with no account, and you can add it to your Home Screen. Peptide Library’s Android app includes calculators and is free to download.
Does it work offline?
It needs a connection to load. After that the math runs on your device.
Is there a peptide calculator for iPhone?
Use this site in Safari. The Peptide Library iPhone app focuses on tracking and research and does not include a calculator. See the iPhone page.
Is there a peptide calculator for Android?
Yes: Peptide Library’s Android app has calculators, and this site works in Chrome. See the Android page.
Related calculators and guides
- CalculatorIPhoneUse a free peptide calculator on iPhone in Safari and add it to your Home Screen.
- CalculatorAndroidUse this free peptide calculator in Chrome on Android, or the Peptide Library Android app, which includes calculators and saves calculations with tracking.
- CalculatorPeptide calculatorFree online peptide calculator for reconstitution, concentration, blends and mcg to mL.
- GuideHow to Use a Peptide CalculatorA step-by-step guide to using a peptide calculator: the three numbers you need, how to read the result, and how to check the answer yourself in under a minute.
Powered by Peptide Library
Keep a record, not just a result
Peptide Library is the free research and tracking platform behind this calculator, on the web, iPhone and Android.
- Schedules and remindersPlan entries and get reminded, with a calendar of past and upcoming ones.
- Logs and journalA history of every entry, with notes and check-ins.
- InventoryWhat’s left in each vial, with run-out and reorder dates.
- Research libraryProfiles for 200+ peptides, side-by-side comparison and human evidence summaries.
Get the app: App Store (tracking, no calculator) · Google Play (tracking and calculators)
Last reviewed · How the calculations work