Calculate84: Graph Calculator

Calculate 84 is a graphing calculator and scientific calculator for high school and college math, intended for use with TI-84 Plus and TI-84 Plus CE. Work with functions, tables, statistics, and matrices using the familiar calculator workflow students and teachers use in class.

Math and entry
• Textbook-style display: fractions, roots, and exponents look like real math.
• Exact fraction answers and decimals, degrees and radians, and complex numbers.
• Scrollable calculation history: tap any previous entry to reuse it instantly.
• Store and recall variables, lists, and matrices in calculator memory.

Graphs and tables
• Graph functions, inequalities, parametric, polar, and sequence equations.
• Calc menu: find zeros, intersections, minimums, maximums, dy/dx derivatives, and integrals.
• Table view alongside your graph with customizable step values.
• Zoom and trace tools to inspect key points on your curve.

Statistics, matrices and solvers
• Advanced statistics: 1-variable and 2-variable stats, regressions (linear, quadratic, exponential, logistic), and stat plots.
• Probability distributions (Normal, Student-t, Chi-square, Binomial, Poisson) and hypothesis testing.
• Full matrix arithmetic: determinants, inverses, and rref.
• Built-in equation solvers: numeric solver, polynomial root finder, and system of equations solver.
• Finance solver (TVM) with amortization.

Smart AI scanner, catalog and programs
• Snap a photo of an equation, worksheet, or data table to prepare your calculator setup.
• Step-by-step guidance when you need help finding the right keys and menus.
• Searchable command catalog and Basic program editor for your own scripts.

Made for students and teachers
• Algebra, Geometry, Precalculus, Calculus, and Statistics.
• SAT, ACT, and AP exam practice at home.
• Students coming from a TI 84, TI84 Plus, or TI-84 CE in class, and their teachers.

TI-84, TI-84 Plus, TI-84 Plus CE, and TI-84 Evo are registered trademarks of Texas Instruments. Calculate84 is an independent app, not affiliated with or endorsed by Texas Instruments.

Terms of Service: https://fredinax.com/terms/

Recent changes:
Keys you can feel, chats that stay together and equation links.
• Every key answers with a short tick, following your phone's touch feedback setting
• A follow-up question stays in the same chat; Your chats lists each one once
• Share Last Equation or Y=, Matrix, List as a link that opens in Calc84 AI
• Division reads as a slash: 3/4 instead of 3÷4
• MODE ▸ THEME: dark display, menus and Help follow it
Intended for use with TI-84 Plus graphing calculator.