# PhySyCalc - Units Calculator — Scientific Calculator w/Units

> Scientific calculator with integrated unit conversion and physical constants. (iPhone/iPad app by PhySy Ltd.)

- Source: https://appshunter.io/ios/app/physycalc-units-calculator/id654457075 (this page in markdown: same URL + `.md`)
- Developer: [PhySy Ltd](https://appshunter.io/developer/644057582)
- Category: Utilities, Education
- Price: $4.99
- Rating: 4.73/5 from 11 App Store ratings · 9 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 4 MB
- Languages: English
- Released: 2013-08-24
- Data updated: 2026-06-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/physycalc-units-calculator/id654457075/reviews.md

## What is PhySyCalc?

How is PhySyCalc different from other calculators?  It allows you to include unit symbols in your calculations, obtaining the answer in the desired unit without those extra unit conversion steps.  On top of this great simplification, PhySyCalc knows every fundamental physical constant.  It even knows physical properties for elements and isotopes in the periodic table and can calculate formula weights.  This allows you to get numerical answers in the desired unit in a fraction of the time you'd spend on a conventional calculator.  PhySyCalc is quick to learn and easy to use.  Can't remember a unit symbol?  PhySyCalc helps you find and append commonly used units onto a number.  PhySyCalc uses a natural infix notation for calculations.  This means you can enter and read through the entire expression in full before calculating the result, helping you quickly identify and fix any input errors.

Not only does PhySyCalc save you time, it also saves you from mistakes.   A conventional calculator will also give you a numerical answer, even if you accidentally multiplied instead of dividing.  With PhySyCalc you’ll know right away that you entered the calculation wrong because the result will have the wrong units.

As a teaching tool PhySyCalc offers students better insights in the concepts of physical quantity, dimensionality, and units.  A student using PhySyCalc soon understands the connections between the base SI quantities and all the derived quantities.

PhySyCalc's sole ambition is to be the world's best scientific "pocket" calculator.

Below are some sample inputs and outputs of progressive complexity.

Add 2 centimeters and 2 inches and give the answer in centimenters
Input: 	“2 cm + 2 in .. cm”
Output: 	“7.08 cm”

Add 2 centimeters and 2 inches and give the answer in inches
Input: 	“2 cm + 2 in .. in”
Output: 	“2.78740157480315 in”
Note: Swipe two fingers across the display to reduce the number of significant figures.

Multiply 3 teaspoons by 10 and give the answer in fluid ounces
Input: 	“3 tsp • 10 .. floz”
Output: 	“5 floz”

Calculate the rest mass energy of the electron in kiloelectronvolts
Input: 	“m_e•c_0^2 .. keV”
Output: 	“510.99894631902 keV”

Calculate the area in acres of a circle that has a radius of 1 mile.  Recall Area = π•r^2
Input: 	“π•(1 mi)^2..ac”
Output: 	“2010.619298297468 ac”

Calculate the height in yards of a kite on 200 feet of string and flying at an angle of 40° with the ground.  Recall right triangle relationship y = r•sin(angle).
Input: 	“200 ft • sin(40°) .. yd”
Output: 	“42.85250731243595 yd”

Calculate the volume in milliliters of 5 grams of carbon dioxide gas at 300 K and 989 mbar. Recall gas law: V = nRT/p.
Input: 	“(5 g/fw[CO2]•R•300 K)/(989 mbar)..mL”
Output: 	“2856.382301275785 mL”


PhySyCalc features include:
• Quantity units supported in all calculations
• Natural infix notation for entering calculations in full before evaluating
• Intuitive interface for appending units unto numbers so you can enter your calculation quickly
• Minimal buttons in portrait display for ease and speed of use
• Complex number support
• Press and hold delete button to clear entire display
• Left swipe display for unlimited undo makes it easy to find mistakes and correct them
• Right swipe display for redo
• Swipe up for keyboard
• Swipe down and navigate to the right unit for quantity (for iPhone)
• Swipe two fingers down on screen for full list of quantities and units
• Double-touch slide on display to reduce the number of significant figures
• Rotate to landscape for more units and scientific functions
• Press and hold any math function to apply to entire display
• Press and hold = button to retrieve value stored in memory
• Saves and recalls results to memory
• Universal app, supporting both iPhone and iPad displays

## Key features

- Unit symbols in calculations
- Automatic unit conversion
- Physical constants database
- Periodic table data
- Natural infix notation
- Error detection via units

## Recent user reviews (9 of 9)

All indexed reviews: https://appshunter.io/ios/app/physycalc-units-calculator/id654457075/reviews.md

### 4/5 — Very useful

*2021-09-20*

However I’m having trouble getting productive with it. More complete documentation would add value to the app. I use it a lot, but I have to be patient with it. Very comprehensive library of units and constants.

### 5/5 — Still best calculator with unit conversions!!

*2019-11-07*

I rated this 5 stars 3 years ago and I still give it 5 stars.  LOVE IT!  If you are in the sciences - GET THIS.  Convert all kinds of units, mix and match units in a long calculation - choose the output units!  Dimensional analysis in a calculator.  Thanks for this app!

### 5/5 — Must Have Calculator

*2014-10-14*

PhysSyCalc turns an iphone and/or ipad into a very powerful scientific and engineering calculator.  It has some really unique and powerful features that make it a must have tool for scientists and engineerings, i.e., unit tracking, unit conversion and handling of all the critical scientific constants that are needed for common scientific calculations.  However, the thing I find most amazing about PhysSyCalc is that it is also a wonderful tool for general everyday time calculations, like measurements for cooking and converting units for simple measurements around the house.  Hence, this app is not just used at work (Professor Jeffery L. Yarger), where I run a research laboratory in the Chemistry, Biochemistry and Physics Departments at Arizona State University, it is also used by me and my family at home.  Truly a must have app (PhysSyCalc) that has made all our other scientific calculators and simple everyday calculators obsolete.  Furthermore, two of my children have type 1 diabetes and this app has turned their iphones and ipads into a critical carb calculator, and the fact that it handles all the units and conversions is what makes it wonderful for the kids to use and give us (the parents) piece of mind that the kids are calculating carbohydrates in their food correctly and don't have to worry about any silly mistakes because of unit conversions.  Thanks for developing a truly wonderful general calculator that handles units and conversions in a very general and powerful fashion.  -- Professor Jeffery L. Yarger, Department of Chemistry, Biochemistry and Physics at Arizona State University.

### 5/5 — handy little app

*2014-07-03*

Like the big buttons.   Took a while to understand the swipe gestures, but with a little practice I could do complicated calculations with units with ease.   I still prefer to do my calculations on paper, but this app is a great way to double check your calculations.

### 5/5 — simple and powerful little calculator.

*2014-07-02*

I really liked the mac version and was glad that there's a iphone version of this app.

### 5/5 — Great app with a simple design

*2014-06-19*

I was searching the app store scientific calculators and found this app.   It works really well as a replacement for apple’s calculator.   I particularly like the bigger and easier to read buttons. The ability to include units in any calculation is fantastic.  It’s something I’ve never seen before.   It took no time understanding how it works.

### 5/5 — Unique App

*2014-05-07*

There are tons of calculator apps in the App Store but this one does something No other calculator does.  This  gives you ability to calculate with units.  Once you have your answer, you can do on the fly conversions.  There are so many uses, from cooking to high level chemistry, physics, etc.....  It is worth every penny.  I might of passed Analytical Chemistry if I had this app.

### 5/5 — Chairman

*2014-04-20*

Great app. Many uses.

### 5/5 — perfect calculator app with units

*2014-03-28*

This calculator app does just what I need. The thing that makes it so good is I can directly include units into the calculation, and the calculator takes them all into account in the calculations and converts them in the results. You can easily convert the results between equivalent units. This is just great for doing homework calculations in chemistry and physics. (Or just converting units from metric to SI, for example)

## Frequently asked questions about PhySyCalc

### What is PhySyCalc?

PhySyCalc is a scientific calculator that allows you to include unit symbols in your calculations, automatically converting the answer to your desired unit. It also includes physical constants and properties of elements.

### How does PhySyCalc help prevent calculation errors?

PhySyCalc helps prevent errors by checking the units of your result. If you accidentally multiply instead of divide, the units will be incorrect, immediately alerting you to a mistake in your input.

### Can PhySyCalc be used for learning physics concepts?

Yes, PhySyCalc serves as a teaching tool by offering students better insights into physical quantity, dimensionality, and units, helping them understand the connections between base SI quantities and derived quantities.

### What is the price of PhySyCalc?

PhySyCalc is a paid application, priced at $4.99. This one-time purchase grants you access to all its features.

### On which devices can I use PhySyCalc?

PhySyCalc is available for iPhone, iPad, and iPod touch devices. It is designed to run on Apple's mobile operating system.

### How often is PhySyCalc updated?

The latest version of PhySyCalc is 2.15, last updated on May 8, 2021. While updates are not extremely frequent, the app is stable and functional.

### Does PhySyCalc have ads?

No, PhySyCalc does not contain advertisements. As a paid application, it offers an ad-free experience.

### What is the age rating for PhySyCalc?

PhySyCalc has an age rating of 4+, making it suitable for users of all ages. Its educational and utility features are broadly applicable.

## Version history (last 5 releases)

### 2.15 — 2021-05-08

Updates for iOS 14.5

### 2.14 — 2021-02-16

Minor Bug Fixes

### 2.13 — 2019-12-13

• bug fix: help text appears correctly in dark mode.

### 2.12 — 2019-12-07

• bug fix

### 2.11 — 2019-12-05

Updates for iOS 13

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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 2026-06-10.*