Free Graphing Calculator
A powerful graphing calculator with TI-84 style statistics, matrices, and distributions — a free alternative to TI-84 online emulators. No sign-up required.
HD Function Graphing
Plot up to 10 functions simultaneously — standard, parametric, and polar. Pan, zoom, and trace with a modern canvas renderer that makes TI-84's 96×64 pixel screen look ancient.
Statistics & Regression
Enter data into lists L1–L6, compute 1-Var Stats, and run LinReg, QuadReg, ExpReg, and PwrReg — with correlation coefficients and scatter plots.
Matrix Operations
Work with up to 10 matrices [A]–[J]. Add, multiply, find determinants, compute inverses, and row-reduce to RREF — all with a proper grid editor.
Distribution Functions
normalcdf, invNorm, tcdf, binompdf, chi-square, and Poisson — the same distribution functions from the TI-84 DISTR menu, with shaded area visualizations.
Free Online Graphing Calculator — TI-84 Alternative
Free Tool Shed's graphing calculator brings TI-84 functionality to your browser with a modern, high-definition interface. Plot functions in crisp detail instead of on a 96×64 pixel screen. Run linear regressions, compute matrix operations, and evaluate distribution functions — all without buying a $100+ calculator or downloading a sketchy ROM emulator. Every calculation is verified against TI-84 reference outputs with over 200 automated tests, so you can trust the results for homework, exams, and research.
Features
- Plot up to 10 functions simultaneously with individual colors
- Standard, parametric (X(t)/Y(t)), and polar (r=f(θ)) graphing modes
- Interactive pan, zoom, and trace with coordinate readout
- Auto-generated x/y value tables with configurable step size
- Degree and radian mode toggle for all trig functions
- 1-Var Stats: mean, median, standard deviation, five-number summary
- Regression: LinReg, QuadReg, ExpReg, PwrReg with r and R² values
- Data entry in lists L1–L6 with scatter plot overlay
- Matrix operations: add, multiply, determinant, inverse, RREF, transpose
- Up to 10 named matrices [A]–[J] with resizable grid editor
- Normal distribution: normalcdf, invNorm, normalpdf
- t-distribution: tcdf, invT — with shaded area visualization
- Binomial: binompdf, binomcdf — matching TI-84 DISTR menu
- Chi-square and Poisson distribution functions
- Command palette (Ctrl+K) for quick function access
- localStorage persistence — your work survives page reload
How to Use the Graphing Calculator
- Graph a function: In Graph mode, type an expression like
sin(x)orx^2 - 4into a Y= slot and see it plotted instantly. - Run a regression: Switch to Stat mode, enter x-values in L1 and y-values in L2, then choose LinReg, QuadReg, ExpReg, or PwrReg from the regression menu.
- Solve a system with RREF: In Matrix mode, enter the augmented matrix and click RREF. The reduced row echelon form gives you the solution directly.
- Compute a normal probability: In Dist mode, select normalcdf, enter lower bound, upper bound, mean, and standard deviation — just like the TI-84 DISTR menu.
- Generate a table: Switch to Table mode, set your start value and step size, and view computed y-values for all active functions.
Comparison: Free Tool Shed vs. TI-84 vs. Desmos
| Feature | Free Tool Shed | TI-84 | Desmos |
|---|---|---|---|
| Price | Free | $100+ | Free |
| Graph resolution | HD canvas | 96×64 px | HD canvas |
| Function graphing | ✓ | ✓ | ✓ |
| Parametric/Polar | ✓ | ✓ | ✓ |
| Statistics (1-Var) | ✓ | ✓ | Limited |
| LinReg/QuadReg | ✓ | ✓ | ✗ |
| Matrix RREF | ✓ | ✓ | ✗ |
| normalcdf/invNorm | ✓ | ✓ | ✗ |
| Binomial/Poisson | ✓ | ✓ | ✗ |
| TI-84 menu structure | Familiar | Native | Different |
| Works in browser | ✓ | Emulators only | ✓ |
| No sign-up required | ✓ | N/A | ✓ (basic) |
Frequently Asked Questions
Is this accurate enough for my statistics class?
Yes. All calculations are verified against TI-84 reference outputs with over 200 automated tests. Results match to at least 4 decimal places — the same precision your TI-84 displays.
Can I use this on an exam?
That depends on your instructor's policy. Many allow browser-based calculators for online exams. This tool runs entirely in your browser with no server communication, so it works offline after the initial load.
Why not just use Desmos?
Desmos is excellent for graphing but doesn't include statistics (regression, distributions) or matrix operations. If your textbook references TI-84 workflows (STAT > CALC > LinReg, DISTR > normalcdf), this tool follows those same workflows with a modern UI.
Does it save my work?
Yes. Your functions, data lists, matrices, and settings are automatically saved to your browser's localStorage and restored when you return.
What functions does the expression parser support?
Standard arithmetic (+, -, *, /, ^), trig (sin, cos, tan, asin, acos, atan), logarithms (log, ln, log10, log2), exponentials (exp, e^x), roots (sqrt, cbrt), and more. Constants pi and e are built in.