Negative vs. subtract
The (−) key makes a number negative. The − key subtracts. Mixing them up is the #1 cause of ERR:SYNTAX.
- Type ⁻3 − 5 and press ENTER.(−)3−5enter
Free TI-84 Calculator Online
Every keystroke.
On the big screen.
The same keys, menus, and steps as the TI-84 Plus CE, right in your browser. No emulator, ROM, or download.
Elite Math Prep
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TI-84 Calculator Cheat Sheet.
Tap Show me and the calculator plays every keystroke, step by step.
Turn a decimal into a fraction
Add ►Frac to the end of any calculation to see the answer as a fraction.
- Type .75 + 1 ÷ 8..75+1÷8
- MATH, 1 pastes ►Frac. Press ENTER.math1enter
Use the last answer (ANS)
ANS holds the previous result, so you can keep working without retyping decimals.
- Find 5².5x²enter
- 2nd (−) pastes Ans. Divide it by 5.2nd(−)ans÷5enter
Fix the last entry (ENTRY)
2nd ENTER brings back what you just typed so you can edit it instead of starting over. Press it again to go further back.
- Calculate 3 × 4.3×4enter
- 2nd ENTER recalls it. DEL removes the 4. Type 5, ENTER.2ndenterentrydel5enter
Round every answer to 2 decimals
Set Fix 2 in MODE. Change it back to FLOAT the same way.
- MODE, ▼▼ to the FLOAT row.mode▼▼
- ▶▶▶ to 2, then ENTER.▶▶▶enter
- 2nd MODE (QUIT), then try π.2ndmodequit2nd^πenter
Store a value in a letter
STO→ saves a number in a variable. ALPHA gets the green letters.
- Store 5 in A: 5 STO→ ALPHA MATH (A), ENTER.5sto→alphamathAenter
- Use it: 2A + 1.2alphamathA+1enter
Scientific notation (EE)
2nd , (EE) means “times 10 to the”. Type 3.2 EE 5 for 3.2 × 10⁵.
- Type 3.2 EE 5, then × 4, ENTER.3.22nd,EE5×4enter
Reset the calculator
Clears every setting, function, and list. Good before a test or when a student’s calculator is acting strange.
- 2nd + (MEM), 7 (Reset...), 1 (All RAM...), 2 (Reset).2nd+mem712
Graph a function
Enter the function in Y=, then use ZStandard for the −10 to 10 window.
- Y=, CLEAR, then X,T,θ,n x² − 4.y=clearX,T,θ,nx²−4
- ZOOM 6 (ZStandard) graphs it.zoom6
Find the zeros (x-intercepts)
At each prompt you can type a number instead of arrowing. Pick bounds on either side of one zero.
- Y1 = X² − 2X − 3, graph with ZOOM 6.y=clearX,T,θ,nx²−2X,T,θ,n−3zoom6
- 2nd TRACE (CALC), 2 (zero).2ndtracecalc2
- Left Bound? 2 ENTER. Right Bound? 4 ENTER. Guess? ENTER.2enter4enterenter
Find a maximum or minimum (vertex)
Same steps as zero: CALC 3 is minimum, CALC 4 is maximum.
- Y1 = ⁻X² + 4X + 1, graph with ZOOM 6.y=clear(−)X,T,θ,nx²+4X,T,θ,n+1zoom6
- 2nd TRACE (CALC), 4 (maximum).2ndtracecalc4
- Left Bound? 0 ENTER. Right Bound? 4 ENTER. Guess? ENTER.0enter4enterenter
Solve an equation (intersect)
Graph each side of the equation. The x-value where they cross is the solution. Here: 2x + 1 = −x + 7.
- Y1 = 2X + 1. ENTER moves to Y2. Y2 = ⁻X + 7.y=clear2X,T,θ,n+1enterclear(−)X,T,θ,n+7
- ZOOM 6, then 2nd TRACE (CALC), 5 (intersect).zoom62ndtracecalc5
- First curve? ENTER. Second curve? ENTER. Guess? ENTER.enterenterenter
Evaluate f(x) on the graph
CALC 1 (value) jumps the cursor to any x in the window. ▲▼ switch between functions.
- GRAPH, then 2nd TRACE (CALC), 1 (value).graph2ndtracecalc1
- Type 3, ENTER.3enter
Full guide
Starts with Y1 = X² − 4.
Evaluate f(3) on the home screen
VARS ▶ 1 1 pastes Y1. Then Y1(3) works just like f(3).
- VARS ▶ (Y-VARS), 1 (Function), 1 (Y1).vars▶11
- Type (3), ENTER.(3)enter
Full guide
Starts with Y1 = X² − 4.
Make a table of values
TBLSET picks the starting x and the step. TABLE shows x and every Y.
- 2nd WINDOW (TBLSET). TblStart = ⁻2, ENTER. ΔTbl = 1, ENTER.2ndwindowtblset(−)2enter1enter
- 2nd GRAPH (TABLE). Use ▲▼ to scroll.2ndgraphtable
Full guide
Starts with Y1 = X² − 4.
Set your own window
Type each value and press ENTER to move down. Xscl and Yscl set the tick marks.
- WINDOW. Xmin ⁻5, Xmax 5, Xscl 1.window(−)5enter5enter1enter
- Ymin ⁻5, Ymax 20, Yscl 5. Then GRAPH.(−)5enter20enter5entergraph
Full guide
Starts with Y1 = X² − 4.
Trace a graph
TRACE puts the cursor on the curve. ◀▶ move along it. Typing a number jumps to that x.
- TRACE, then ▶ a few times.trace▶▶▶
- Type 2, ENTER to jump to x = 2.2enter
Full guide
Starts with Y1 = X² − 4 in ZDecimal, so each step is 0.1.
Turn on r and r²
Do this once so regressions show the correlation coefficient.
- MODE, ▼ down to STAT DIAGNOSTICS.mode▼▼▼▼▼▼▼▼▼
- ▶ to ON, ENTER, 2nd MODE (QUIT).▶enter2ndmodequit
Line of best fit (LinReg)
Enter data in STAT 1 (Edit): x in L1, y in L2. The wizard can also paste the equation into Y1.
- STAT ▶ (CALC), 4 (LinReg(ax+b)).stat▶4
- ▼▼▼ to Store RegEQ. VARS ▶ 1 1 pastes Y1.▼▼▼vars▶11
- ▼ to Calculate, ENTER.▼enter
Full guide
Starts with L1 = {1,2,3,4,5,6} and L2 = {3,5,6,9,11,12}.
Exponential regression
Same wizard as LinReg. ExpReg is STAT ▶ 0 and fits y = a·bˣ.
- STAT ▶ (CALC), 0 (ExpReg).stat▶0
- ▼▼▼▼ to Calculate, ENTER.▼▼▼▼enter
Full guide
Starts with L1 = {0,1,2,3,4} and L2 = {3,6.1,11.8,24.5,48}.
Solve a system with matrices
x + y + z = 6, 2x − y + z = 3, x + 2y − z = 2. Enter the augmented matrix, then rref( gives the solution in the last column.
- 2nd x⁻¹ (MATRIX) ▶▶ (EDIT), 1 ([A]). Size 3 ENTER 4 ENTER.2ndx⁻¹matrix▶▶13enter4enter
- Row 1: 1, 1, 1, 6.1enter1enter1enter6enter
- Row 2: 2, ⁻1, 1, 3.2enter(−)1enter1enter3enter
- Row 3: 1, 2, ⁻1, 2.1enter2enter(−)1enter2enter
- 2nd MODE (QUIT). 2nd x⁻¹ ▶ (MATH), ALPHA APPS (B: rref().2ndmodequit2ndx⁻¹matrix▶alphaappsB
- 2nd x⁻¹, 1 ([A]), ), ENTER.2ndx⁻¹matrix1)enter
Log with any base
MATH A is logBASE(. Here: log₂(8).
- MATH, ALPHA MATH (A), then 8 , 2 ), ENTER.mathalphamathA8,2)enter
e and natural log
2nd LN is eˣ. LN undoes it: ln(e²) = 2.
- LN, 2nd LN (e^(), 2 ) ), ENTER.ln2ndlneˣ2))enter
Cube roots and nth roots
MATH 4 is ³√(. For any root, type the index first, then MATH 5 (ˣ√).
- Type 5, MATH 5, then 32, ENTER.5math532enter
Absolute value
MATH ▶ (NUM), 1 is abs(. Graph it the same way in Y=.
- MATH ▶ 1, then (−)7 ), ENTER.math▶1(−)7)enter
Combinations (nCr)
MATH ◀◀ reaches the PROB menu. 3 is nCr, 2 is nPr, 4 is !.
- Type 10, MATH ◀◀ 3, then 3, ENTER.10math◀◀33enter
Graph trig functions (ZTrig)
ZOOM 7 sets a window marked in π/2 steps. Use RADIAN mode for x in radians.
- Y=, CLEAR, SIN X,T,θ,n ).y=clearsinX,T,θ,n)
- ZOOM 7 (ZTrig).zoom7
Switch to DEGREE mode
Geometry angles are in degrees. The top bar shows DEGREE when you are set.
- MODE, ▼▼▼ to RADIAN DEGREE.mode▼▼▼
- ▶ to DEGREE, ENTER, 2nd MODE (QUIT).▶enter2ndmodequit
Find a side with sin, cos, tan
Hypotenuse 12, angle 35°. Opposite side = 12 sin(35°).
- Type 12, SIN 35 ), ENTER.12sin35)enter
Full guide
Starts in DEGREE mode.
Find an angle with inverse trig
Opposite 7, hypotenuse 10. The angle is sin⁻¹(7/10). 2nd SIN is sin⁻¹.
- 2nd SIN, 7 ÷ 10 ), ENTER.2ndsinsin⁻¹7÷10)enter
Full guide
Starts in DEGREE mode.
Pythagorean theorem
Legs 5 and 12. Hypotenuse = √(5² + 12²). 2nd x² is √(.
- 2nd x², 5 x² + 12 x² ), ENTER.2ndx²√5x²+12x²)enter
Distance between two points
From (1, 2) to (4, 6): √((4 − 1)² + (6 − 2)²).
- 2nd x², (4 − 1) x² + (6 − 2) x² ), ENTER.2ndx²√(4−1)x²+(6−2)x²)enter
Area of a circle with π
Radius 6. 2nd ^ is π. Leave the answer in the calculator instead of rounding π to 3.14.
- 2nd ^ (π), 6 x², ENTER.2nd^π6x²enter
Sector area
A 60° sector of a circle with radius 5: (60/360)·π·5².
- (60 ÷ 360) 2nd ^ (π) 5 x², ENTER.(60÷360)2nd^π5x²enter
Law of Cosines: find an angle
Sides 7, 8, 9. The angle across from 9 is cos⁻¹((7² + 8² − 9²) ÷ (2·7·8)).
- 2nd COS, then (7² + 8² − 9²).2ndcoscos⁻¹(7x²+8x²−9x²)
- ÷ (2 × 7 × 8) ), ENTER.÷(2×7×8))enter
Full guide
Starts in DEGREE mode.
Law of Sines: find a side
a / sin(40°) = 10 / sin(65°), so a = 10 sin(40°) ÷ sin(65°).
- 10 SIN 40 ) ÷ SIN 65 ), ENTER.10sin40)÷sin65)enter
Full guide
Starts in DEGREE mode.
Round to the nearest tenth
MATH ▶ (NUM), 2 is round(value, decimal places).
- MATH ▶ 2, then 2nd x² 50 ) , 1 ), ENTER.math▶22ndx²√50),1)enter
Volume of a sphere
Radius 3: (4/3)πr³. MATH 3 is the ³ (cubed) key.
- 4 ÷ 3, 2nd ^ (π), 3, MATH 3 (³), ENTER.4÷32nd^π3math3enter
Everything you use on a TI-84.
Built around the TI-84 Plus CE menus and menu numbers your students already know.
Graph and trace
Ten functions in color, ZStandard, ZDecimal, ZTrig, ZBox, ZoomFit, and TRACE with typed x-values.
The CALC menu
value, zero, minimum, maximum, intersect, dy/dx, and ∫f(x)dx, with the same Left Bound, Right Bound, and Guess prompts.
Tables
TBLSET with TblStart and ΔTbl, Auto or Ask, and a scrolling table for every function.
Statistics
The list editor, 1-Var and 2-Var Stats, LinReg, QuadReg, CubicReg, ExpReg, LnReg, PwrReg, and scatter plots.
Matrices
The matrix editor plus det(, inverse, transpose, ref(, and rref( for systems of equations.
Everyday math
Fractions with ►Frac, log with any base, nth roots, degrees or radians, nCr and nPr, and the Numeric Solver.
Projector Mode
A giant copy of the screen and every key pressed, readable from the back of the room.
Show me demos
Every cheat sheet card plays its keystrokes on the calculator, one key at a time.
Looking for a TI-84 emulator?
Emulators such as CEmu and jsTIfied run Texas Instruments’ own software, so they need a ROM file copied from a calculator you own. This calculator needs nothing. It opens instantly on a Chromebook, laptop, tablet, or phone.
Compare TI-84 emulator optionsPopular TI-84 guides.
- How to Find Zeros (x-Intercepts) on a TI-84
- How to Find the Intersection of Two Graphs on a TI-84
- How to Find a Maximum or Minimum on a TI-84
- How to Do Linear Regression on a TI-84
- How to Make a Table of Values on a TI-84
- How to Put a TI-84 in Degree Mode
- How to Get a Fraction Answer on a TI-84
- How to Solve a System of Equations with Matrices on a TI-84
Questions.
Is this a TI-84 emulator?
Not exactly, and that is on purpose. An emulator runs Texas Instruments’ own operating system, so it needs a ROM file copied from a calculator you own. This calculator was built from scratch to use the same keys, menus, and keystroke sequences as the TI-84 Plus CE, so it runs instantly in your browser with no ROM, download, or account. Compare TI-84 emulator options.
Is it free?
Yes. There is nothing to buy, no sign-up, and no ads.
Does it work on a Chromebook, iPad, or phone?
Yes. It runs in any modern browser, including Chromebooks, Windows, Mac, iPad, and phones. You can also type with your computer keyboard: numbers, + − * / ^, Enter, Backspace for DEL, and Esc for CLEAR.
Is it the same as a TI84 Plus CE?
The keys, menus, and menu numbers match the TI-84 Plus CE, so steps like 2nd TRACE 5 or STAT ▶ 4 work the same way. It graphs, traces, finds zeros, maxima, minima, and intersections, makes tables, runs regressions, and solves matrices. It does not run TI programs or apps, and it does not do complex numbers. Answers are shown on one line (Classic mode) instead of stacked MathPrint fractions.
Can I use it on the SAT?
No. The SAT allows an approved handheld calculator or the Desmos calculator built into Bluebook. Phones, tablets, and laptops are not allowed unless you have an approved accommodation. Use this site to practice the exact TI-84 keystrokes before test day.
Does it work like the new TI-84 Evo?
This calculator follows the TI-84 Plus CE key layout, which is the model most students have. The TI-84 Evo, released in April 2026, has a redesigned keypad, so some key positions differ.
How do teachers use it in class?
Press Start Projector Mode. The calculator goes full screen with a large copy of the display and every key you press shown in big letters, so students in the back row can follow along. Every card in the cheat sheet has a Show me button that plays the keystrokes step by step.
Can I put this calculator on my class website?
Yes. Copy the embed code in the Embed section and paste it into Google Sites, Canvas, Schoology, or any page that accepts HTML.
Who made this?
Elite Math Prep built it for classroom use. It is not affiliated with or endorsed by Texas Instruments. TI-84 Plus CE is a trademark of Texas Instruments Incorporated.