# The Expressions Calculator — Ideal companion for studies > Advanced scientific calculator with unit handling, formulas, and ChatGPT integration. (iPhone/iPad app by Andre Rubbia.) - Source: https://appshunter.io/ios/app/the-expressions-calculator/id1528185049 (this page in markdown: same URL + `.md`) - Developer: [Andre Rubbia](https://appshunter.io/developer/704743896) - Category: Productivity, Education - Price: Free with in-app purchases (on sale, was $0.99) - Rating: 4.71/5 from 14 App Store ratings - Age rating: 4+ - Requires: iOS 17.5 · 8 MB - Languages: English - Released: 2021-09-15 - Data updated: 2026-06-10 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/the-expressions-calculator/id1528185049/reviews.md ## What is The Expressions Calculator? ExpressionsCalculator is a multifunction scientific calculator offering a wide range of features specific for anyone looking from basic to advanced calculations. It is an ideal tool optimised for high-school and STEM university students, chemists, engineers, mathematicians and physicists. ExpressionsCalculator is revolutionary in the way it helps you solve problems by providing you, in addition to all the basic features of a calculator, a rich sample of natural constants, a large database of commonly used formulae in mathematics, physics and chemistry, all this in a fully embedded and aware SI (MKSA), imperial (foot, pound, …) and astronomical (ly, parsec, …) units context. Hence, in ExpressionsCalculator a physical quantity has a unit. When you perform calculations, units are always taken care of and automatically simplified to provide the most sensible result. Derived units such as Newton, Joule, etc. are handled. Conversions from one unit to others are automatic. In addition, ExpressionsCalculator can also handle multi-dimensional vectorial quantities. Here is a short overview of the other main features of ExpressionsCalculator: - Arithmetics on integers, rational and floating numbers - Handles very large and very small numbers (arbitrary precision arithmetic on integers) - Extended floating point range - Fully embedded handling of units - Large set of available units (SI, imperial) - Handles angles in both degrees and radians - Full calculations with units - Automatic conversion of units - Vector algebra (+,-, scalar and vector products) - Comprehensive list of natural constants with their proper units - Comprehensive list of astronomical constants with their units - Full periodic table with lots of properties for each element - List of refractive indices of many materials - Fully assignable constants with extended naming possibilities - An extensive database of Expressions encompassing most commonly used formulae in mathematics (geometry, vectors), physics (kinematics, dynamics, thermodynamics, special relativity, atomic physics) and chemistry. ___________________________________________________________________________________________ Chat mode: - try a different way to perform calculations and respond to query - access ChatGPT to increase your productivity, get rapid responses to your queries(*) ___________________________________________________________________________________________ (*) Access to ChatGPT requires an in-app subscription. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ ## Key features - Unit handling and automatic conversion - Vector algebra support - Database of natural and astronomical constants - Extensive formula library - Periodic table with element properties - ChatGPT integration for enhanced productivity ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Monthly subscription | $0.99 | per month | | Yearly subscription | $9.99 | per year | ## Frequently asked questions about The Expressions Calculator ### What is the Expressions Calculator? Expressions Calculator is a multifunction scientific calculator designed for students and professionals in STEM fields. It offers advanced features like unit handling, formula databases, and vector algebra. ### Does Expressions Calculator have ads? No, Expressions Calculator does not contain advertisements. It is free to download and use, with optional in-app purchases for enhanced features. ### What are the subscription options for Expressions Calculator? Expressions Calculator offers a monthly subscription for $0.99 and a yearly subscription for $9.99. These subscriptions provide access to features like ChatGPT integration. ### What kind of calculations can Expressions Calculator perform? It handles basic arithmetic, integers, rational and floating numbers, very large and small numbers, unit conversions, vector algebra, and complex formulas from mathematics, physics, and chemistry. ### Is Expressions Calculator available on all devices? Expressions Calculator is supported on iPhones and iPads, as indicated by its compatibility with these devices. ### How often is Expressions Calculator updated? The app was last updated on August 13, 2024, with version 1.5.1. This suggests regular updates to maintain functionality and add new features. ### What is the age rating for Expressions Calculator? Expressions Calculator has an age rating of 4+, making it suitable for a wide range of users, including younger students. ### Can Expressions Calculator handle different unit systems? Yes, it fully supports SI (MKSA), imperial (foot, pound), and astronomical (ly, parsec) units, and automatically handles conversions between them. ## Version history (last 5 releases) ### 1.5.1 — 2024-08-13 - minor improvements ### 1.5 — 2023-12-19 - minor bug fixes - upgrade to ChatGPT3.5 model (via subscription) ### 1.4 — 2023-01-19 - new Chat mode to more naturally perform your tasks - and YES! we have integrated access(*) to the MUCH ACCLAIMED ChatGPT !!! be the first one to try it !! - minor bug fixes (*) Unlimited access to ChatGPT requires a subscription. ### 1.3 — 2022-12-19 - NEW: paste expression from clipboard - NEW: select default radians or degrees in trigonometry - iPhone iOS 16 ready - NEW: Runs on iPads ! - NEW: Runs on Macs with M1 processors ! - Minor bug fixes ### 1.2 — 2021-10-05 - minor improvements - built for iOS 15 ## More apps by Andre Rubbia - [CardBlaster!](https://appshunter.io/ios/app/cardblaster/id6464203234) All apps by Andre Rubbia: https://appshunter.io/developer/704743896 --- *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 2026-06-10.*