The TI-84 Plus CE is the graphing calculator found in more math classrooms than any other β from Algebra and Geometry to Statistics, Precalculus, and Calculus. This page gives you a free online TI-84 calculator that works exactly like the physical device, plus a complete user manual that walks you through every major feature step by step.
The emulator above is fully interactive: click the ON key to power it up, then press any key with your mouse just as you would on the real calculator. No download, no installation, and no account needed. If you are brand new to the TI-84, start with our complete beginner's guide β then come back here whenever you need a quick refresher on a specific task.
Turn it on. Click the ON key in the bottom-left corner of the calculator. The home screen appears instantly. To turn it off again, press 2ND followed by ON.
Type a calculation. Click the number and operator keys, then press ENTER. Try 2+2 β the answer 4 appears on the right side of the screen.
Use second functions. Most keys have a second function printed above them. Press 2ND first, then the key, to access it. Press ALPHA to type the green letters above the keys.
Back out of anything. If you ever get lost in a menu, press 2ND then MODE (QUIT) to return to the home screen. Pressing CLEAR erases the current line.
The keypad is organized into zones. Knowing them saves you from hunting for keys:
Graphing keys (top row)
Y= enters functions, WINDOW sets the viewing window, ZOOM offers quick presets, TRACE moves along a curve, GRAPH draws the plot.
2ND and ALPHA
Modifier keys that unlock the secondary (yellow) and letter (green) functions printed above every key.
MATH, APPS, PRGM, VARS
MATH opens fractions, number tools and probability; APPS / PRGM / VARS handle applications, programs and stored variables.
STAT and editing keys
STAT opens statistics menus; the arrow pad navigates, DEL and CLEAR edit, X,T,ΞΈ,n types the variable, and STOβ stores values.
Press MODE to control how the calculator behaves. The settings beginners change most often are:
Float vs. fixed decimals: Float shows full precision. Choose 2, for example, to round every answer to two decimal places β handy for money problems.
Radian vs. Degree: set Degree for geometry-style angle problems and Radian for calculus and most trigonometry in higher math. A wrong mode is the #1 cause of "wrong" trig answers.
Func / Par / Pol / Seq: Func (function) is the normal y = f(x) graphing mode. The others graph parametric, polar, and sequence plots.
MathPrint vs. Classic: MathPrint shows fractions and roots the way they look in a textbook.
Use the arrow keys to highlight a setting and press ENTER to select it, then 2ND + MODE to quit back to the home screen.
The TI-84 follows the standard order of operations, but a few habits prevent most beginner mistakes:
Use parentheses generously. For a fraction like (3+4)/5, type (3+4)/5 β without parentheses you get 3+4/5, which is a different problem.
Negative vs. subtract: the (-) key makes a number negative; the blue β key subtracts. Mixing them up causes syntax errors.
Reuse your last answer with ANS (press 2ND then (-)). It inserts the previous result into your current calculation.
Recall your last entry with ENTRY (2ND + ENTER) β perfect for fixing a typo without retyping everything.
Store values with STOβ: type 3.14, press STOβ, then ALPHA + MATH (the letter A), and ENTER to save it as variable A.
Graphing is the TI-84's signature skill. Here is the exact workflow:
Press Y= and type your function next to Y1=, for example X^2-4 (use the X,T,ΞΈ,n key for X and the ^ key for powers).
Press WINDOW to set the viewing area. The defaults (Xmin=-10, Xmax=10, Ymin=-10, Ymax=10) work for most classroom problems.
Press GRAPH to draw the curve.
Press TRACE, then use β βΊ to walk along the curve and read exact x/y coordinates at the bottom of the screen.
Press ZOOM for presets: 6:ZStandard resets the standard window, 0:ZoomFit auto-fits the window to your function.
For a deeper walkthrough with window tricks and multiple functions, see our step-by-step graphing tutorial.
Press 2ND + TRACE to open the CALC menu β this is where the TI-84 does real analysis on your graph:
2:zero β x-intercepts
Move the cursor left of the intercept, press ENTER (left bound), move right of it, press ENTER (right bound), then ENTER once more to guess.
5:intersect β crossing points
Finds where two graphed functions cross. Select the first curve, then the second, then guess near the crossing point.
3:minimum / 4:maximum
Locates the lowest or highest point of a curve in a region you bound the same way.
1:value & 7:β«f(x)dx
value evaluates the function at any x you type; β«f(x)dx computes the definite integral between two x-values.
For equations you cannot solve by hand, use the built-in solver:
Press MATH, then select Solver....
Type your equation with = (press ALPHA + MATH to get the equals sign), for example 0=X^2-4.
Press ENTER on the line X= and the calculator finds a solution. Give it a starting guess near the answer you expect if it struggles.
Our equation-solving guide covers systems of equations and solver troubleshooting in detail.
The TI-84 is a statistics workhorse. The basic pattern is always the same: enter data into a list, then run a calculation on it.
Press STAT, choose 1:Edit, and type your data into list L1 (clear old data first with CLEAR while the list header is highlighted).
Press STAT, arrow right to CALC, and choose 1:1-Var Stats. Press ENTER twice to get the mean (xΜ), sample standard deviation (Sx), min, max, and quartiles.
For paired data in L1 and L2, choose 4:LinReg(ax+b) instead to get the line of best fit plus the correlation coefficient.
Learn more in our full statistics guide, the mean/median/standard deviation tutorial, and the linear regression walkthrough.
Press 2ND + xβ»ΒΉ to open the MATRIX menu:
Arrow to EDIT, choose a matrix name like [A], set its dimensions (rows Γ columns), and type in the entries.
Return to the home screen (2ND + MODE), reopen the MATRIX menu, and select [A] under NAMES to paste it into a calculation.
Add, subtract, and multiply matrices with +, β, and Γ. For the inverse, type [A] then press the xβ»ΒΉ key. The determinant is under MATH β det( in the MATRIX menu.
Remember: you can only add matrices of the same size, and you can only multiply when the inner dimensions match β otherwise you get ERR:DIM MISMATCH. See the complete matrices tutorial for worked examples.
Press MATH and arrow to the PRB tab:
nPr β permutations
Order matters: type 5, then nPr, then 2 β 5 nPr 2 = 20.
nCr β combinations
Order doesn't matter: 5 nCr 2 = 10.
! β factorial
5! = 120.
rand & randInt(
rand gives a random decimal between 0 and 1; randInt(1,6) simulates a die roll.
Our probability and distributions guide goes further into binomial and normal distributions.
Almost every TI-84 error has a simple cause. Here are the ones you will actually see:
| Error | What it means | The fix |
|---|---|---|
| ERR:SYNTAX | A typo β usually a missing parenthesis or comma. | Press 2:Goto on the error screen to jump to the mistake, or press ENTRY and fix it. |
| ERR:DIM MISMATCH | Matrix or list dimensions don't line up for the operation. | Check that matrices have compatible sizes before adding or multiplying. |
| ERR:WINDOW RANGE | Invalid window settings, e.g. Xmin is greater than Xmax. | Press ZOOM β 6:ZStandard to reset the window. |
| ERR:INVALID DIM | A stat plot is trying to graph an empty or mismatched list. | Press Y= and turn off any highlighted Plot1/Plot2/Plot3 at the top. |
| ERR:DATA TYPE | Wrong kind of input β e.g. text where a number belongs. | Re-enter the value as a plain number. |
| ERR:ARCHIVED | The variable is stored in archive memory. | Press 2ND + + (MEM) β 2:Mem Mgmt and unarchive it. |
For any error, pressing 2ND + MODE (QUIT) always gets you safely back to the home screen.
Clear the home screen fast: press CLEAR repeatedly, or 2ND + MEM β Reset for a full reset.
Convert decimals to fractions: after a calculation, press MATH β 1:βΊFrac.
Chain calculations: end a line with an operator (like +) and press ENTER β the calculator continues from ANS automatically.
Scroll through history: the arrow keys move through everything on the home screen; press ENTER on any old line to reuse it.
Check your angle mode before any trig problem β Degree vs. Radian mistakes are silent and costly.
Turn off stat plots when you go back to normal graphing, or you may get a confusing ERR:INVALID DIM.
More speed tricks are in our shortcuts and tips article.
Yes. The emulator on this page is completely free β no download, no signup, and no time limits. It runs entirely in your browser.
Absolutely β it behaves like a real TI-84 Plus CE, so it's ideal for homework, practice problems, and learning the menus. Note that most schools don't allow phones or browser tools during actual exams; check your teacher's policy.
Nine times out of ten, the calculator is in the wrong angle mode. Press MODE and switch between Radian and Degree to match your problem.
Press 2ND + + (MEM), choose 7:Reset, then 1:All RAM. This clears memory but keeps the operating system intact.
The TI-84 Plus CE is newer, with a color backlit screen, rechargeable battery, and more memory β but the menus and keystrokes are nearly identical. Skills transfer directly; see our TI-83 online page for the classic model.
Browse the TI calculator blog for tutorials on graphing, statistics, matrices, probability, and every major TI-84 function.
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