TI-84 Calculator
A free TI-84 style scientific calculator in your browser: TI-84 key layout, DEG/RAD modes, trig, logs, powers, roots, π, e and ANS.
Click buttons or use your keyboard. Press Enter to evaluate, Backspace to delete, Esc to clear.
Or use the standard form below
What is a TI-84 calculator?
This TI-84 calculator is a free, TI-84 style scientific calculator that runs in your browser. It copies the layout of the Texas Instruments TI-84 Plus — the same SIN, COS, TAN, LOG, LN, x², ^ and (−) keys, a MODE key that switches between degrees and radians, and an ANS key that reuses your last answer — so the keystrokes you practise here are the ones you will use on the handheld.
It is built for the work students do most on a TI-84's home screen: evaluating expressions with trigonometry, logarithms, exponents and roots, checking homework answers, and getting used to how a TI-84 reads an expression. That includes the rules that catch people out on tests — -3^2 is −9, not 9, and sin(30) is 0.5 only in degree mode.
What it does not do. This is not an emulator of the TI-84 operating system, so there is no graphing (Y=), no STAT lists, no MATH, APPS or PRGM menus and no programs. Those keys are shown so the layout feels familiar, and they tell you so when pressed. For one-variable statistics — the mean, standard deviation and quartiles a TI-84 gives with 1-Var Stats — use our statistics calculator, which uses the same quartile method. For graphing, the free Desmos graphing calculator is the same tool the College Board builds into its Bluebook testing app.
TI-84 and TI-84 Plus are trademarks of Texas Instruments. Zetta Calculators is not affiliated with or endorsed by Texas Instruments.
Functions and constants
The keypad and the standard form below it accept the same functions. Type function names in lower case.
| What you want | Key or typed form | Example | Result |
|---|---|---|---|
| Add, subtract, multiply, divide | + − × ÷ (or * and /) | 7×6−2 | 40 |
| Power | ^ or x² | 2^10 | 1024 |
| Reciprocal | x⁻¹ or ^(-1) | 4^(-1) | 0.25 |
| Square root, cube root | √ or sqrt( ), ∛ or cbrt( ) | sqrt(2) | 1.414214 |
| Common log (base 10) | LOG or log( ) | log(1000) | 3 |
| Natural log (base e) | LN or ln( ) | ln(e^2) | 2 |
| e to a power | eˣ or exp( ) | exp(1) | 2.718282 |
| Trigonometry | SIN, COS, TAN | cos(60) in DEG | 0.5 |
| Inverse trigonometry | asin( ), acos( ), atan( ) | asin(0.5) in DEG | 30 |
| Absolute value | |x| or abs( ) | abs(-4) | 4 |
| Constants | π (pi) and e | 2pi | 6.283185 |
| Factorial (standard form) | fact( ) | fact(5) | 120 |
| Hyperbolic and rounding (standard form) | sinh, cosh, tanh, floor, ceil, round | floor(2.7) | 2 |
How a TI-84 reads an expression
- Order of operations: parentheses first, then powers, then multiplication and division, then addition and subtraction — left to right within each level.
- Negation comes after powers:
-3^2means −(3²) = −9. To square a negative number, put it in parentheses:(-3)^2= 9. The same goes for-2^4(−16) and(-2)^4(16). - Implicit multiplication:
2pi,3(4+1),(2)(3)and2sqrt(9)all multiply, just as on the handheld. - Open parentheses are closed for you at the end of the line, so
sin(30is read assin(30)— andsin(30+1as sin(31), which may not be what you meant. - Angle mode: SIN, COS and TAN read their input in degrees in DEG mode and in radians in RAD mode; the inverse functions answer in the current mode.
Worked example
Example 1: a mixed expression in degree mode
Evaluate sin(30)+sqrt(16)+2^3 with MODE set to DEG.
- sin(30°) = 0.5
- √16 = 4
- 2³ = 8
- Total: 0.5 + 4 + 8 = 12.5
In RAD mode the same keystrokes give 11.011968, because the calculator now takes sin of 30 radians, which is −0.988032. If a trig answer looks strange, check the mode before anything else.
Example 2: the negative-number trap
-3^2 gives −9 and (-3)^2 gives 9. The calculator squares first and negates second unless parentheses say otherwise — the most common reason a TI-84 answer "disagrees" with a hand calculation.
Example 3: compound growth in one line
$1,000 at 5% a year, compounded monthly for 10 years: 1000(1+0.05/12)^(12×10) gives 1647.009498, so the balance is about $1,647.01. The multiplication between 1000 and the opening parenthesis is implied, exactly as on the handheld.
Example 4: chaining steps with ANS
Enter 2^10 and press ENTER (1024). Then press ANS, type /4 and press ENTER: the result is 256. ANS always holds the last answer, so a multi-step problem never needs retyping — and it keeps every digit, not just the ones on screen.
How to use this calculator
- Click the keys, or type with your keyboard: digits, + − * / ^ ( ) and the decimal point work directly. Use the on-screen keys for functions such as SIN, LOG and √.
- Press MODE to switch between DEG and RAD. The current mode is shown in the corner of the screen.
- Press ENTER (or the Enter key) to evaluate. The expression moves up and the answer appears below it.
- Use ANS to reuse the last answer, DEL (Backspace) to delete and CLEAR (Esc) to start again.
- Prefer to type a whole expression? Use the standard form under the keypad: it shows how your expression was read and lets you choose how many decimal places to display.
Practising for a test
- SAT: you may use a calculator on the whole Math section — the Desmos calculator built into Bluebook, or your own handheld such as a TI-84. Calculators with a computer algebra system (CAS) and anything with a QWERTY keyboard are not allowed.
- ACT: calculators are allowed on the math test only. The TI-84 is permitted; CAS models such as the TI-89, TI-92 and TI-Nspire CAS are prohibited.
- AP Calculus AB and BC: some parts of the exam require a graphing calculator and others allow none; only models on the College Board's approved list may be used, and the TI-84 family is on it.
- AP Statistics: a graphing calculator with statistical functions is expected.
- Online calculators, including this one, cannot be used during these tests — practise here, then use the same keystrokes on test day.
Policies are updated from time to time, so check the official pages before test day. For help choosing a model, see TI-84 vs TI-Nspire vs Casio and using a TI-84 on the SAT and AP exams.
Sources
Frequently asked questions
Is this a real TI-84 emulator?
No. A true emulator runs Texas Instruments' own operating system, which cannot be offered freely online. This is a TI-84 style scientific calculator: it has the TI-84 key layout and follows the same rules on the home screen — order of operations, negation, implicit multiplication, DEG/RAD — but it does not graph, run programs or open the STAT, MATH, APPS or PRGM menus.
Why does sin(30) give −0.988 instead of 0.5?
The calculator is in radian mode. sin(30°) = 0.5, but sin(30 radians) = −0.988032. Press MODE until the screen shows DEG and try again. On a real TI-84 the same setting is in the MODE menu, and it is the single most common cause of wrong trig answers on tests.
Why does -3^2 equal −9?
Because powers are worked out before negation. -3^2 means −(3²) = −9. If you want the square of −3, write (-3)^2, which is 9. A TI-84 behaves exactly the same way, and so do most textbooks.
Can I use this calculator on the SAT, ACT or AP exams?
No — online calculators are not allowed during those tests. On the SAT you can use the Desmos calculator built into the Bluebook app or bring an allowed handheld such as a TI-84. On the ACT and AP exams you need a permitted handheld calculator. Use this page for homework and practice so the keystrokes are familiar on test day.
What is the difference between log and ln?
log(x) is the common logarithm, base 10: log(1000) = 3 because 10³ = 1000. ln(x) is the natural logarithm, base e ≈ 2.71828: ln(e²) = 2. The TI-84 has separate LOG and LN keys with the same meanings. To use another base, divide: log base 2 of 8 is log(8)/log(2) = 3.
Can it graph functions or do statistics like a TI-84?
Not on this page. For the TI-84's 1-Var Stats — mean, standard deviation, quartiles, minimum and maximum — paste your data into our statistics calculator, which uses the same quartile method. For graphing, Desmos offers a free online graphing calculator, the same one built into the SAT's Bluebook app.
How do I enter a negative number?
Press the (−) key before the number, or type a minus sign. Wrap negative numbers in parentheses when they are raised to a power or follow another operator: (-2)^3 = −8 and 5×(-2) = −10. On a real TI-84, (−) and the subtraction key are different keys; using the subtraction key at the start of a line subtracts from the previous answer.