# Calculator 3 in 1

> Multi-mode calculator with scientific, RPN, and tip functions, plus a constants library. (iPhone/iPad app by PPCLINK Software.)

- Source: https://appshunter.io/ios/app/calculator-3-in-1/id582172403 (this page in markdown: same URL + `.md`)
- Developer: [PPCLINK Software](https://appshunter.io/developer/833424538)
- Category: Utilities, Productivity
- Price: Free
- Rating: 2.40/5 from 5 App Store ratings · 77 written reviews indexed
- Age rating: 4+
- Requires: iOS 7.0 · 25 MB
- Languages: American English
- Released: 2012-12-10
- Data updated: 2026-09-08
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/calculator-3-in-1/id582172403/reviews.md

## What is Calculator 3 in 1?

Award Winning Calculator Since 2007 
HiCalc - Calculator for iPhone & iPod touch will make all your calculations become simpler than ever. 

► Noteworthy 
• RETINA ready! 
• 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 

► 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, Integration function, Root-Finder and Product function, Greatest Common Divisor, Least Common Multiple, Fibonacci function... 

► Tip calculator 
Easy & funny to use. 

►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

- Standard, String, and RPN calculation modes
- High precision up to 31 digits
- Complex number support
- Advanced scientific functions
- Expression history up to 135 items
- Constants library with 1500 entries
- Tip calculator functionality

## Recent user reviews (10 of 77)

All indexed reviews: https://appshunter.io/ios/app/calculator-3-in-1/id582172403/reviews.md

### 5/5 — Best calculator to replace default one

*2023-08-21, version 1.5*

T thấy đây là phần mềm calc đỉh nhất dành cho những ng thường xuyên phải làm các phép tính đơn giản như cộng trừ nhân chia. Đặc biệt nó free và là phần mềm của Vn.

Pls fix in iphone 12, very big number and can't use.

### 1/5 — 아이폰14에서 해상도 안맞음

*2023-01-18, version 1.5*

해상도가 맞지않아서 크게 나옵니다
 수정해 주세요

### 1/5 — Lỗi màn hình

*2022-09-15, version 1.5*

Không hiển thị các số bấm và bàn phím trên iphone Xs

### 3/5 — No landscape view

*2022-05-06*

…is a disappointment.

### 3/5 — Please fix!

*2021-10-26, version 1.5*

Error on iPhone 12 mini/iOS 15.0.2.

### 1/5 — GUI error

*2021-10-11, version 1.5*

gui error ios 14

### 2/5 — ipone13 用不了

*2021-09-24*

为什么到ipone13用不了？

### 5/5 — 聪拔

*2021-08-09*

这是本人用过最好用的计算器软件

### 1/5 — Lỗi

*2021-06-18, version 1.5*

Sao mà lỗi k dùng được

### 3/5 — 咋放大了

*2020-12-20*

用了这么多年…突然更新了系统居然没用了…

## Frequently asked questions about Calculator 3 in 1

### What calculation modes does Calculator 3 in 1 support?

Calculator 3 in 1 supports three calculating modes: STANDARD, STRING, and RPN. The STRING mode also supports complex numbers and advanced scientific functions like differential and integration.

### How precise is Calculator 3 in 1?

This calculator offers precision up to 31 digits, making it suitable for highly detailed calculations. It also features an extended memory for deep calculations.

### Does Calculator 3 in 1 have ads?

No, Calculator 3 in 1 is ad-free, providing an uninterrupted user experience. This is a notable feature for a free utility application.

### What kind of scientific functions are available in Calculator 3 in 1?

The scientific calculator includes trigonometric functions (sin, cos, tan, etc.), logarithms, hyperbolic functions, differential and evaluation functions, root-finder, product function, GCD, LCM, and Fibonacci sequence, among others.

### Can Calculator 3 in 1 handle complex numbers?

Yes, Calculator 3 in 1 supports complex numbers within its STRING mode. This expands its utility for advanced mathematical and scientific applications.

### What is the Constants Library in Calculator 3 in 1?

The Constants Library contains over 1500 predefined constants from fields like Mathematics, Physics, and the Solar System, such as Avogadro's number and the speed of light, for quick access.

### What is the update frequency for Calculator 3 in 1?

The app was last updated on October 3, 2016, with version 1.5. While it has been available since 2012, there have been updates in the past.

### What devices is Calculator 3 in 1 compatible with?

Calculator 3 in 1 is designed for iPhone and iPod touch devices. It is also noted as being RETINA ready.

## Version history (last 5 releases)

### 1.5 — 2016-10-03

This app has been updated by Apple to display the Apple Watch app icon.

- Support iOS 10
- Fix some small bugs

### 1.4 — 2013-05-23

- Fix some bugs in RPN, constant, periodic table mode

### 1.3 — 2013-03-01

- Add EXP button and Fix some bugs in Unit Converter

### 1.2 — 2013-01-16

- Fix some bugs in Constants and nCr, nPr functions

### 1.1 — 2012-12-12

- Fix some minor bugs

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All apps by PPCLINK Software: https://appshunter.io/developer/833424538

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*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 2026-09-08.*