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TI-84 Plus™ Calculator Online
The keypad you already know, in a browser tab. Function, polar and parametric graphing, a table of values — and a step solver the handheld never shows you.
Expressions
Keypad
Table of Values
| x | y |
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What You Get
The parts of the handheld that actually matter
A TI-84 is a machine with decades of muscle memory behind it. These are the features students actually reach for — rebuilt for a browser and extended with the working.
Faithful keypad
Rows, columns and function keys sit where they sit on the handheld, so you stop hunting for the key and start remembering where it is.
Function, polar & parametric
Graph y = f(x), r = f(θ) or x(t)/y(t) from the same keypad, switching modes from the toolbar exactly as the handheld's mode key does.
Table of values
Generate the table for any expression and read the points a question asks for, without plotting each one by hand.
Scientific functions
Sin, cos, tan, natural and base-10 logs, exponentials, roots and absolute value — each key inserts straight into the expression.
Polar & parametric graphing
Switch to polar to plot r = f(θ), or parametric to plot x(t) and y(t) together, from the toolbar.
Step-by-step solving
Send an equation to the step solver and get the method, not just the number — quadratics, linear equations, systems and derivatives.
Side by Side
This vs the physical TI-84 Plus CE
The handheld is a remarkable machine and worth buying if your course requires one. But if you just need to practise, this covers the same ground for nothing.
Getting Started
How to graph a function on the TI-84 Plus™
Graphing on a TI-84 Plus™ is the same three-move routine every time: open the function list, type your equation, and view the result. The difference from a physical device is that you can do it here without carrying a calculator or charging anything.
Step 1 — Open the Y= editor
Press Y= to open the function entry screen. You get six rows, each with an expression field and a colour bar. Type your equation into the first row.
The calculator in this page is pre-loaded with an example. Clear the field and type your own, or use the keypad below it — tappingsin inserts sin( with the bracket already placed.
Step 2 — Enter your equation
Type it the way you would on the handheld. The x key is right there, and the ^ key raises to a power, sox^2 - 3 is exactly four keystrokes.
Multiplication can be implicit — write 2x rather than2*x. The calculator converts it for you.
Step 3 — View the graph
Press GRAPH and the curve appears immediately. If the window looks wrong — the curve is a flat line, or nothing is visible at all — press ZOOM then 6:ZStandard to reset to the standard −10 to 10 window. The toolbar reset button does the same thing.
Step 4 — Explore it
Drag the pointer along the curve to read coordinates, or pressTRACE to step through values. The table button generates a table of values for the current window, which is the fastest way to answer a question about a specific input.
When the graph does not look right
Most unexpected graphs come down to the viewing window rather than the equation. If your curve is a flat line, you are probably zoomed in too far. If it is empty, check that the function is switched on — the expression list lets you toggle each row.
If you are getting an error message instead of a graph, theTI-84 Plus™ error code guide covers every error the handheld can throw and what to do about each one.