# 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.

Canonical: https://bestpeptidecalculator.app/peptide-calculator-app
Last reviewed: 2026-11-08

Interactive calculator on the page: reconstitution, blend, volume. It runs in the browser and never suggests an amount.

## 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](https://peptidelibrary.app/compare/best-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](https://bestpeptidecalculator.app/iphone-peptide-calculator).

### 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](https://bestpeptidecalculator.app/android-peptide-calculator).

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Research and educational use only. Not medical advice. Best Peptide Calculator is powered by Peptide Library (https://peptidelibrary.app).