# Concentrations — Concentrations calculator

> Concentrations calculator (iPhone/iPad app by Marcal Casas Cartagena.)

- Source: https://appshunter.io/ios/app/concentrations/id468150886 (this page in markdown: same URL + `.md`)
- Developer: [Marcal Casas Cartagena](https://appshunter.io/developer/468150889)
- Category: Education, Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 18.5 · 7 MB
- Languages: American English
- Released: 2011-10-03
- Data updated: 2026-06-03
- User reviews in markdown: https://appshunter.io/ios/app/concentrations/id468150886/reviews.md

## What is Concentrations?

Concentrations is a powerful chemical calculator designed for laboratory professionals who need fast, accurate concentration calculations in the field. Say goodbye to manual dilution factor calculations, density conversions, and purity adjustments.
The Problem We Solve:
Ever needed to prepare a 1M sulfuric acid solution, but your stock bottle only shows "98% w/w" with molecular weight and density? Concentrations does the complex math for you instantly—just input your stock solution data and get precise preparation instructions with a single tap.
Key Features:

Smart Dilution Calculator – Calculate dilution parameters from stock solutions or known molar concentrations with ease
Comprehensive Concentration Types – Support for Molar, Normal, Molal, Mole Fraction, Mass Concentration, Volume Fraction, and more
Simple Input, Powerful Results – Enter your compound's molecular weight, desired concentration, and volume—Concentrations handles the rest
Customizable Precision – Adjust decimal places in results to match your experimental requirements
Localized Interface – Automatically adapts decimal indicators to your regional format

Who It's For:
Perfect for chemists, laboratory technicians, students, and researchers who need reliable concentration calculations without the hassle of manual computation.
Stop fumbling with calculators and conversion tables. Get accurate results every time with Concentrations.


## Version history (last 5 releases)

### 3.1 — 2026-02-22

I found some bugs and I send them to a farm. With other bugs. They are happy there.
Also some performance improvements.

### 3.0 — 2025-11-13

Version 3.0 – Complete Rebuild

We've completely rebuilt Concentrations from the ground up with modern technology and your feedback in mind. This isn't just an update—it's a whole new app.
What's New:

Modern Architecture – Rebuilt entirely in Swift and SwiftUI for improved performance, reliability, and a smoother user experience
Customizable Databases – Edit and manage your own stock solution and solvent (solvate) databases to match your laboratory's inventory
Enhanced Visual Results – Results now display with clear visual aids and improved formatting for easier interpretation
Personalization Options – Customize the app to your preference with adjustable background colors and full Dark Mode support

Why This Matters:
This complete rewrite ensures Concentrations will continue to serve the chemistry community for years to come with better stability, faster calculations, and a more intuitive interface.

### 2.0 — 2011-12-14

Completely new User Interface.
Support for Landscape orientation.
Built-in library with common stock solutions.
Improved performance.

Supports Catalan and Spanish languages.

### 1.1 — 2011-11-28

An issue regarding the behaviour of the Tab Bar is fixed.

In a few weeks a major update concerning User Interface and optimized code will be available.

I have a copuple of Chemistry related (NMR spectroscopy) waiting for review. Don't forget to have a look on iTunes!

### 1.0 — 2011-10-01

No release notes.

## More apps by Marcal Casas Cartagena

- [Pure NMR](https://appshunter.io/ios/app/pure-nmr/id482490330)
- [Pano Assist](https://appshunter.io/ios/app/pano-assist/id532997023)
- [Erasmus Tracker](https://appshunter.io/ios/app/erasmus-tracker/id6758699184)

All apps by Marcal Casas Cartagena: https://appshunter.io/developer/468150889

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-03.*