What is the TI-84 online calculator?
This is a free, browser-based calculator laid out like the familiar TI-84. It handles everyday arithmetic, scientific functions and graphing, so you can check homework, practise for tests or plot an equation without installing anything. It works on phones, tablets and computers.
It is an independent tool and is not affiliated with Texas Instruments. It does not run TI programs, but it covers the calculations most students use every day.
How to use the calculator
- Tap the keys or type on your keyboard. The expression appears on the entry line at the bottom of the screen.
- Press ENTER to calculate. The answer is shown on the right and kept in the history above.
- Use Ans to reuse the previous answer. Starting a line with an operator, such as + or ×, continues from the last result.
- Use DEL to remove one character and CLEAR to empty the line and the history.
How to graph a function
Open the Graph tab. Type an equation in terms of x, such as sin(x), x^2-4 or 1/x, then press Plot. You can enter a second equation in Y2 to compare two curves. Change Xmin, Xmax, Ymin and Ymax to set the window, use Zoom in and Zoom out to adjust it, and move your finger or mouse across the graph to trace the X and Y values.
Supported functions
| Key | What it does |
|---|---|
| sin, cos, tan | Trigonometric functions. Results follow the DEG or RAD mode shown on the screen. |
| asin, acos, atan | Inverse trigonometric functions. Type them on the keyboard, for example asin(0.5). |
| ln, log | Natural logarithm and base-10 logarithm. |
| √, x², ^ | Square root, square and any power. |
| x! | Factorial of a whole number up to 170. |
| π, e | The constants pi and Euler’s number. |
| abs, exp | Absolute value and e raised to a power. Type these on the keyboard. |
Degrees and radians
The calculator starts in radian mode, like the TI-84. Tap the RAD key to switch to degrees (it then shows DEG). The current mode is shown in the top corner of the screen. For example, sin(30) gives 0.5 in degree mode, while sin(π/2) gives 1 in radian mode.
Open it in a separate window
Press Open in new window above the calculator to pop it out into its own small window. This is handy when you want to keep the calculator beside a worksheet, a video lesson or an online test page.
Tips for accurate results
- Check that the mode matches your problem before using trigonometric functions.
- Use brackets to make the order of operations clear, for example (2+3)×4.
- Answers are shown to 10 significant digits, and very large or very small values use E notation, such as 1.5E12.
- If you see ERR:SYNTAX, check for a missing function bracket or a stray symbol. ERR:DOMAIN means the input is outside what the function allows, such as ln(0).