An online alternative to the TI-84

Need a TI-84 and don’t have one to hand? This page shows how to do each common TI-84 task in a free browser calculator. It is not an emulator, so it won’t run TI programs or replace a calculator in an exam that requires one, but it does every graphing and statistics job, usually in fewer key presses.

Open in calculator

Y1 = x³ − 4x and Y2 = 2x − 1, with their zeros, turning points and intersections found automatically when you select a curve.

Getting started

1
Open the calculator. There is no Y= screen: just type y = … on a new row.
2
There is no WINDOW screen either: drag to pan and scroll or pinch to zoom. The axes rescale as you go.
3
Select a curve to mark its zeros, maxima, minima and intersections. They replace 2nd CALC.
4
Your graphs are saved in the browser automatically, and you can share any graph with a link.

TI-84 tasks and how to do them here

On a TI-84	Here
Y= then GRAPH	Type `y = x^2 - 3` on a row
WINDOW / ZOOM	Drag, scroll or pinch; Home resets the view
2nd TABLE	Add a table from the + menu, or type `f(1)`
2nd CALC → zero	Select the curve: roots are marked and listed
2nd CALC → maximum / minimum	Select the curve: extrema are marked
2nd CALC → intersect	Select one curve: intersections with the others are marked
2nd CALC → dy/dx	Type `f'(2)` or use the Analysis tab
MATH → fnInt	`int(x^2, x, 0, 3)`, with an error estimate
STAT → EDIT	A table with columns x1, y1
STAT → CALC → LinReg(ax+b)	`y1 ~ a x1 + b`
STAT → CALC → 1-Var Stats	`mean(D)`, `stdev(D)`, `quartile(D, 1)`
DISTR → normalcdf / invNorm	`normalcdf(a, b, μ, σ)` and `invnorm(p)`
DISTR → binompdf / binomcdf	`binompdf(n, p, k)` and `binomcdf(n, p, k)`
MODE → DEGREE	Graph settings → Angles → Deg

What is different, and what isn’t

Results agree with a TI-84 to the digits it shows, and are usually computed to more: roots and intersections are refined to about twelve significant digits. Quartiles use the same median-of-halves convention as TI calculators.

What you can’t do here: run TI-BASIC programs or apps, or use it in an exam room that requires an approved handheld. Standardised tests such as the SAT and ACT supply their own on-screen calculator, and many state tests do too.

Things a TI-84 can’t do

3D surfaces and implicit equations such as x² + y² = 9 without solving for y.
Symbolic algebra: factoring, solving, antiderivatives (the CAS models do this; the TI-84 does not).
Slope fields, phase portraits and vector fields.
Exports for documents: SVG, PDF and LaTeX.

Examples to try

Zeros and intersections

y = x^3 - 4xy = 2x - 1

Select either curve to see its zeros, extrema and the three intersections.

Open this example

Normal distribution

y = normalpdf(x)0 <= y <= normalpdf(x) {-1 < x < 1}

normalcdf(−1, 1) ≈ 0.6827, the shaded area.

Open this example

Frequently asked questions

Is this a TI-84 emulator?

No. It is a different graphing calculator that runs in your browser. It does the same graphing, table and statistics tasks but does not run TI programs.

Can I use it on the SAT or ACT?

No. Those tests provide their own built-in calculator, and handheld rules are set by each exam. This is for homework, practice and teaching.

How do I find the zeros of a function?

Select the curve. Its zeros are marked on the graph and listed, refined to about twelve digits.

Does it have normalcdf and invNorm?

Yes: normalcdf(a, b, μ, σ), invnorm(p, μ, σ), and the t, χ², binomial and Poisson functions.

Is it free?

Yes, completely, with no account and no ads.