Calculate84

Calculate84

Intended for use with TI-84

52K ratings
340 reviews
Free
In-App PurchasesWith Ads

Details

  • Released
  • Updated
  • August 17, 2019
  • August 3, 2026

Features

Calculate84 screenshot #1 for iPhone
Calculate84 screenshot #2 for iPhone
Calculate84 screenshot #3 for iPhone
Calculate84 screenshot #4 for iPhone
iphone
ipad
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About

This app offers a modern graphing calculator experience on your iPhone. It features fast, interactive touch-screen graphing, scrollable windows, and intelligent error messages for a more intuitive user experience. Designed to be a usable alternative to physical graphing calculators.

Fast, interactive touch-screen graphing
Scrollable windows
Intelligent error messages
Intuitive interface
Designed for TI-84 users
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What users say

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+2

What's New in Calculate84

3.0.1

August 3, 2026

Fixed an issue where the equation table could lose your place after switching apps. This update brings a major 3.0 refresh to graphing, equation editing, function help, and everyday calculator workflows. - New smoother graphing with better panning, zooming, tracing, labels, highlights, and inline graph previews - Redesigned equation table that feels faster, scrolls more naturally, and keeps your recent work easier to follow - Function help previews now show examples and argument details directly where you need them - New support for implicit graphing, fixed-range graph inputs, clearer trace labels, coordinate labels, and stat plot previews - Improved equation editing with better cursor movement, selection, copy/paste, matrix editing, and math formatting - New interactive number and matrix adjustment controls for quicker editing and exploration - Better layouts on iPad, Mac, and large screens, including keypad sizing, split controls, spacing, and keyboard handling - Refreshed search with smoother animations, cleaner results, and improved accessibility behavior - Clearer graph and equation rendering, especially for labels, large text, complex expressions, and formatted results - Performance and reliability improvements across graphing, tables, equation solving, keypad resizing, and daily use

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Subscription plans

Monthly Pro Subscription

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$2.991 Month
3 Days trial
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In-App Purchases

$6.99

Lifetime Subscription

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User reviews

Exactly what you pay for

It works exactly like how you expect it to. It’s literally a full fledged TI-84 calculator that’s on your phone. You have to pay the 30 dollars to actually use all of the features but that’s way cheaper than ones you can get at the store. This is a must have for anybody in school

Awesome!

This calculator is great I love how much it resembles the hand held version but I also really appreciate the little updates that allow you to edit your equations more easily than the hand held TI84 (or at least the one I have). This App is great I would highly recommend it.

5 Years in and Still my Go-to Calculator app

Way past school age at this point but I still use this for all my calculating needs.

A definite must-have for any smartphone user

iPhone user

If you are an iPhone user and need a calculator that is simple and easier to use with Trigonometry this is it !!!

Amazing

Works just like the real thing!

Developer apps

User experience

🐞

Reported Bugs

4 issues

Crashes when using 2-sample T/Z interval functions

Bug

Incorrect results for inverse trig functions

Bug

Issues with graphing parabolas and tracing points

Bug

Regression equation not displayed correctly

Bug

Requested Features

5 requests

Add TVM solver functionality

Feature

Implement more regression types

Feature

Allow disabling of ads for free users

Feature

Restore previous purchase benefits

Feature

Optimize for mobile experience instead of emulating physical calculator

Feature

FAQ

What does Calculate84 do?

Calculate84 provides a modern graphing calculator experience directly on your iPhone. It aims to replicate the functionality of physical graphing calculators with a user-friendly interface, featuring fast touch-screen graphing and scrollable windows.

What are the key features of Calculate84?

Key features include fast and interactive touch-screen graphing, scrollable windows for easier navigation, and intelligent error messages to help users understand and correct mistakes. The interface is designed to be intuitive and familiar.

Is Calculate84 free to use?

The app is available for free, but it does include in-app purchases and advertisements. This allows users to try the core functionality before deciding to invest further.

What devices is Calculate84 compatible with?

This application is designed for use on iPhones, offering a portable and accessible graphing calculator solution. It is intended to be a modern alternative to traditional physical calculators.

Who would benefit from using Calculate84?

Students, educators, and anyone who regularly uses a graphing calculator for math, science, or engineering tasks would benefit. It's particularly useful for those who prefer a digital interface or are accustomed to TI-84 calculators.