# Calculator & Unit Converter > Advanced calculator with scientific, financial, and unit conversion tools. (iPhone/iPad app by CAT VIET SOFTWARE DEVELOPMENT & MEDIA JSC.) - Source: https://appshunter.io/ios/app/calculator-and-unit-converter/id442665708 (this page in markdown: same URL + `.md`) - Developer: [CAT VIET SOFTWARE DEVELOPMENT & MEDIA JSC](https://appshunter.io/developer/833424538) - Category: Utilities, Productivity - Price: $2.99 - Rating: 3.61/5 from 28 App Store ratings · 50 written reviews indexed - Age rating: 4+ - Requires: iOS 7.0 · 46 MB - Languages: English - Released: 2011-06-14 - Data updated: 2026-06-10 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/calculator-and-unit-converter/id442665708/reviews.md ## What is Calculator & Unit Converter? HiCalc - Calculator for iPad will make all your calculations become simpler than ever. ► Scientific calculator: sin, cos, tan, deg/rad/grad, Pi, sin-1, cos-1, tan-1, sinh, cosh, tanh, log, ln, sinh-1, cosh-1, tanh-1, Dec->Deg, Deg->Dec, XY->R, Random, nPr, nCr, Differential function, Evaluation function,... ► Necessary functions for your popular daily calculation: • Currency Converter • Unit Converter • Date - Time • Finance ► Engineering & Finalcial Calculator: • Graph • Statistics • Equation Solver • Finance • Base Conversion ► Noteworthy • RETINA ready! • New! Biorhythm calculator  • Support three calculating modes: STANDARD, STRING and RPN • Support precision to 31 digits • Supports Complex numbers in STRING mode • Powerful scientific calc with advanced fx: Differential, Evaluation, Integration, Product, Root-Finder… • Support Extended Memory for deep calculation • Expression history up to 135 items • Sending data from Ext-Memory & History list • Copy & Paste support • Intuitive interface & No ADs ► Features:
 • Multi-line LED-Calculator • Smart input which allows input of complicated expressions • Show expression as normal writing mode @ very useful for students • Supports both USA and EUROPEAN styles for date and numeric separator • Advanced RPN mode with Stack viewer and functions: DROP, SWAP, ROLL, DEPTH, PICK, OVER, KEEP, LAST, CLEAR ► Tip calculator Easy & funny to use. ► Biorhythm calculator How are you today? How is your health factor this week, next month, next year? Biorhythm calculator will show you health factors as : physical, intellectual, intuitional and also emotional factor. ► Constants Library The Constants Library includes 1500 constants from Mathematics, Physics, Solar System and Element e.g: Avogadro number, Faraday const, Coulomb const, Gravitational const, Stefan-Boltzmann Const, Speed of Light, Euler constant... ## Key features - Scientific calculator functions - Unit and currency converter - Date and time calculations - Engineering and financial tools - Graphing and equation solver - RPN mode support - Constants library ## Recent user reviews (10 of 50) All indexed reviews: https://appshunter.io/ios/app/calculator-and-unit-converter/id442665708/reviews.md ### 5/5 — “Go-To” For everything! *2022-03-22, version 5.8* I am a self-taught Astrophysicist, Astronomer, and Rocket engineer (simulated). I searched a long time, through a ton of different software to make unit conversions or specific mathematic formulas, easier. I then found 12 in 1 Calculator. Very intuitive design, and has such an incredibly versatile library. I really enjoy reading my biorhythm statistics! I recommend this if you’re anything like me, I love chemistry, geometry, math, mechanical engineering, (coding soon). I do it all, and 12 in 1 has it all! ### 5/5 — The best at conversion *2021-08-10, version 5.8* Better than any I’ve tried. Includes virtually every option. ### 3/5 — Crashes on 14.3 *2020-12-28, version 5.8* Was great now always crashes on launch ### 3/5 — Bummed *2019-06-02, version 5.8* I have used this calculator for years. Very disappointed that when I finally needed the mortgage calculator that I can’t print or share the amortization table. Reason for dropping my review. Great calculator other than that. ### 1/5 — Currency convert bug *2019-03-21, version 5.8* The currency convert bug remains 😔 ### 5/5 — Absolute Best All Trade Calculator for iPad! *2019-02-07, version 5.8* You won’t find anything to come close to handle whatever calculation you need!, Thank you!! ### 5/5 — The Best iPad Calculator! *2018-12-02, version 5.8* This is a great app, you don't need any other calculator at all and it takes full advantage of iPad's HD. Plenty of tools. The best deal for the price! ### 3/5 — Skin pack *2018-05-11, version 5.7* Skin color orange doesn't work. Only reason I bought this calculator because it reminded me of LCARS. Please fix and yes I bought the skin pack. ### 5/5 — Just perfect *2017-08-31, version 5.7* There is so far no better investment I have made on the App Store, I've been an apple user for 8+ years and this is my very first review I've written. I am yet to encounter any problems and if you are either in college or financing this calculator is perfect for you. Personally, I'm in college and I seriously doubt that I will ever encounter an equation that this calculator cannot handle. 10/10 ### 1/5 — bio rhythm problem *2017-08-09, version 5.7* when switch to bio rhythm that interface not show probably, and could not switch to other function. ## Frequently asked questions about Calculator & Unit Converter ### What does this calculator app do? This app is a powerful calculator that goes beyond basic arithmetic. It includes a scientific calculator with advanced functions like trigonometry and logarithms, as well as specialized tools for engineering, finance, and unit conversions. It also offers date and time calculations and a comprehensive constants library. ### What are the key features of this calculator? Key features include a full scientific calculator, currency and unit converters, date and time calculations, engineering and financial tools, graphing capabilities, an equation solver, and support for multiple calculation modes like RPN. It also boasts an intuitive interface with no ads and precision up to 31 digits. ### Is this calculator app free to use? Yes, the application is available for free. There are no advertisements within the app, and all its features are accessible without any cost to the user. ### What kind of calculations can I perform with the scientific calculator? The scientific calculator supports a wide range of functions including sin, cos, tan, inverse trigonometric functions, hyperbolic functions, logarithms, and constants like Pi. It also offers differential and evaluation functions, and supports complex numbers in string mode. ### Who would benefit from using this app? This app is ideal for students learning mathematics and science, engineers who need precise calculations and unit conversions, financial professionals for complex financial computations, and anyone who requires a versatile and advanced calculator for daily tasks or specific projects. ## Version history (last 1 release) ### 5.8 — 2018-09-05 This app has been updated by Apple to display the Apple Watch app icon. What's new in version 5.8? - Fix Currency Converter bug - Update Periodic table - Fix some other minor bugs reported by users Thanks so much for using Calculator by PPCLINK. If you have any feedbacks, please contact us at office@ppclink.com. 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User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*