# Function Calc — fully programmable calculator

> Programmable scientific graphing calculator with tape display and custom functions. (iPhone/iPad app by Hugh Pelham.)

- Source: https://appshunter.io/ios/app/function-calc/id1188227053 (this page in markdown: same URL + `.md`)
- Developer: [Hugh Pelham](https://appshunter.io/developer/1188227052)
- Category: Productivity, Utilities
- Price: Free
- Rating: 5.00/5 from 3 App Store ratings · 5 written reviews indexed
- Age rating: 4+
- Requires: iOS 18.4 · 5 MB
- Languages: English
- Released: 2017-01-09
- Data updated: 2026-07-25
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/function-calc/id1188227053/reviews.md

## What is Function Calc?

A full-function, programmable, graphing scientific calculator designed to be very quick and easy to use, but with the added power of customisation.  Tape display is visible while you type, and a swipe away from full screen view.  Select and directly input any number from tape, undo or edit calculations.  Easily create and use custom functions, store equations and useful numbers, use complex functions with multiple variables - fully programmable.  Plot functions on a zoomable graph, export a high-resolution pdf copy.  Dictate calculations and numbers for statistical analysis, with instant results. Completely free.

• no adverts, no in-app purchases.
• full set of scientific functions, unlimited nested brackets.
• swipe to undo, step by step.
• easily edit calculations and re-calculate.
• optionally enter and edit calculations in standard maths format, rather than calculator order.
• visible memory store.
• tape output shows all calculations – swipe for full screen.
• never type the same number twice – direct input from tape.
• instantly convert between more than 120 different units.
• zoomable text for easy reading and editing.
• fully editable useful numbers page – store constants, conversion factors, commonly used numbers, tappable URLs or email addresses, or any text.
• create, store and use functions for unit conversions or calculations, as simple as copy and paste.
• dictate calculations, or lists of numbers for statistical analysis, get instant results.
• create, edit and use complex functions with up to ten inputs or outputs – solve quadratic and cubic equations, calculate mortgage payments, compound interest, body mass index, triangles, the day of the week for any date, sunrise and sunset times and direction for any date and place, statistics (including normal, Student's T, Chi Square and F cumulative probability functions) and more – create or keep exactly what is useful, edit or delete what isn’t. 50 functions included. 
• fully zoomable graphing capability, plot one or two functions on a graph.  Export PNG or high-resolution large pdf copies.
• ideal for complex or repetitive tasks – custom functions reduce errors.
• full help included.

## Key features

- Programmable custom functions
- Graphing capabilities
- Tape display with edit/undo
- Unit conversions (120+)
- Dictate calculations
- Export graphs (PDF, PNG)

## Recent user reviews (5 of 5)

All indexed reviews: https://appshunter.io/ios/app/function-calc/id1188227053/reviews.md

### 5/5 — Incredibly Comprehensive!

*2026-06-21*

This is probably THE MOST POWERFUL calculator  app in existance today. And it is completely FREE and SECURE.  The only dowside is the almost vertical learning curve.

### 5/5 — This app is so great but make it the greatest

*2024-03-28*

Hugh,

I have dedicated some times to evaluate your product.

I rate it as 5 although it needs some enhancements.

Kindly please find time in future versions to include if , for , else or then statements, loops, max and min to make it the greatest. Even more so it is able to add graphics on the background for a certain repetitive problem.

I salute you even more as you are giving it free to humanity and for that you are truly blessed.

Hope to see these enhancements soon and more 
feedback from me.

Thank you very much!

Vernon P., PE, MAA emeritus

### 5/5 — Great functionality, but want more precision

*2023-11-06*

As a programmer I use the calculator to work with large numbers and sometimes I need to see more digits.

For example:
268,697,600 x 512  shows 1.37573171e11 but is missing the last (9th) digit in the general display - although in the history tab it displays accurately, but this can be confusing and annoying.

### 1/5 — This work in portrait mode

*2020-07-12*

I installed this because one of the first statements was that it works in portrait mode, it doesn’t. Uninstalled.

### 5/5 — Clean and simple. I like it!!

*2019-11-18*

Very good calculator app. Wow, no ads and it’s free. Thx

## Frequently asked questions about Function Calc

### What makes Function Calc a programmable calculator?

Function Calc allows you to create, store, and use custom functions with up to ten inputs or outputs. This means you can automate complex or repetitive calculations, reducing errors and saving time.

### Can Function Calc graph functions?

Yes, Function Calc features fully zoomable graphing capabilities. You can plot one or two functions on a graph and export high-resolution copies as PNG or PDF files.

### How does the tape display in Function Calc work?

The tape display shows all your calculations as you type them, providing a visible record. You can easily select and input numbers directly from the tape, undo steps, or edit previous calculations.

### Does Function Calc support dictation?

Yes, you can dictate calculations or lists of numbers for statistical analysis directly into Function Calc. The app provides instant results for your dictated inputs.

### How many unit conversions does Function Calc offer?

Function Calc includes instant conversion between more than 120 different units, making it a versatile tool for various scientific and everyday tasks.

### Is Function Calc available on other devices besides iPhone?

Based on the provided data, Function Calc is currently supported on iPhone. Information about availability on other platforms like Android or desktop is not specified.

### How often is Function Calc updated?

Function Calc was last updated on February 16, 2026, indicating a recent update. The app has a version number of 17.2.

### What is the age rating for Function Calc?

Function Calc has an age rating of 4+, making it suitable for a wide range of users including younger individuals.

## Version history (last 5 releases)

### 17.5 — 2026-07-21

This version includes new functions to calculate dew/frost point, heat index and wind chill, as well as other improvements and bug fixes.

### 17.4 — 2026-06-21

Fine tuning and some bug fixes.

### 17.3 — 2026-05-07

Small improvements and bug fixes.

### 17.2 — 2026-02-16

Some more minor improvements and bug fixes.

### 17.1 — 2026-01-19

This version corrects some minor bugs and anomalies.

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## More apps by Hugh Pelham

- [Jumbler](https://appshunter.io/ios/app/jumbler/id1533580800)

All apps by Hugh Pelham: https://appshunter.io/developer/1188227052

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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 2026-07-25.*