What can this graphing calculator do?

You can plot up to 3 functions at once, set the x and y viewing window, and sample enough points to get smooth curves. It supports common functions like sin, cos, tan, log, ln, sqrt, abs, and combinations.

Change the X min, X max, Y min, and Y max values and click Plot again. This updates the viewport just like a handheld graphing calculator.

What syntax should I use?

Use standard math.js syntax: x^2, sin(x), cos(x), tan(x), log(x,10), ln(x)=log(x), sqrt(x), abs(x). Use * for multiplication, e.g. 2*x not 2x.

Does it find intersections or roots?

This tool focuses on plotting and inspection. You can visually locate intersections and then evaluate the functions at nearby x-values to refine the point.

Graphing Calculator

Plot functions in real time. Type your equations, set the window, and click Plot. You can add up to 3 functions to compare shapes, intersections, and behavior.

Functions f(x)

f₁(x) primary

f₂(x)

f₃(x)

Syntax: use * for multiply (2*x), pi, e, abs(), sqrt(), log(x,10), etc.

Window (view)

X min

X max

Y min

Y max

Samples (resolution)

Graph

If a function is undefined for part of the range (e.g. sqrt of negative), that segment is skipped.

How the graphing calculator works

To plot a function, we:

Take your x-range (for example −10 to 10).
Sample N points (default 300) evenly spaced across that range.
Evaluate each function at those x values using a math parser.
Feed the resulting x–y pairs into a charting engine to draw the curves.

If a function returns NaN or Infinity for some x, we drop that point, producing gaps for asymptotes.

Common functions to try

Linear: 2*x + 3

Quadratic: x^2 - 4*x + 2

Trigonometric: sin(x), cos(x), sin(x)/x

Exponential / log: exp(0.3*x), log(x,10)

Absolute value: abs(x)

Piecewise (basic): use if(x < 0, -x, x) kind of structures (math.js style).

FAQs

Can I plot parametric or polar?

This version focuses on Cartesian y = f(x). For parametric/polar you’d need a specialized plotter, but you can often rewrite simple cases as y = f(x).

Why is my graph cut off?

Your y-values may be outside the current view. Increase Y min/Y max and plot again.

Does it work on mobile?

Yes, it’s responsive and lightweight, unlike some desktop graphers.

Audit: Complete

Formula (LaTeX) + variables + units

This section shows the formulas used by the calculator engine, plus variable definitions and units.

Formula (extracted LaTeX)

\[','\\]

','\

Formula (extracted text)

Linear: 2*x + 3 Quadratic: x^2 - 4*x + 2 Trigonometric: sin(x), cos(x), sin(x)/x Exponential / log: exp(0.3*x), log(x,10) Absolute value: abs(x) Piecewise (basic): use if(x < 0, -x, x) kind of structures (math.js style).

Variables and units

T = property tax (annual or monthly depending on input) (currency)

Sources (authoritative):

NIST — Weights and measures — nist.gov · Accessed 2026-01-19
https://www.nist.gov/pml/weights-and-measures
FTC — Consumer advice — consumer.ftc.gov · Accessed 2026-01-19
https://consumer.ftc.gov/

Changelog

Version: 0.1.0-draft
Last code update: 2026-01-19

0.1.0-draft · 2026-01-19

Initial audit spec draft generated from HTML extraction (review required).
Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
Confirm sources are authoritative and relevant to the calculator methodology.

Verified by Ugo Candido on 2026-01-19
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