Graphing Calculator Online — Free Function Plotter

Enter any function of X in the Y1= field. Supports standard math notation: X², sin(X), log(X), e^(X), abs(X), √(X), and implicit multiplication (2X = 2×X). Click the graph to trace: a dashed line appears and all Y values are shown for that X coordinate. Zoom: Use Zoom + and Zoom − to zoom in/out from the center. Presets: ZStandard (±10), ZDecimal (±4.7 for clean decimal grids), ZTrig (±2π for trig functions). WINDOW: Set exact axis limits and scale intervals with the WINDOW editor. Up to 6 functions in different colors can be graphed simultaneously.

**Graphing polynomial functions** Enter X^2-4 or X²-4 to graph a parabola. Try X³-3X for a cubic. The graph auto-draws as you type. **Graphing trig functions** Set DEG or RAD mode first. sin(X) in DEG mode draws a wave between -1 and 1 with period 360. Use ZTrig preset (xmin=-2π, xmax=2π) for the ideal trig window. **Graphing exponentials and logs** e^(X) grows rapidly — use Zoom + first. log(X) is only defined for X > 0 (the left side will be blank). ln(X) = natural log. **Finding intersections (manual)** Graph both functions (Y1= and Y2=), then trace to approximately find where they cross. For exact intersections, algebraically set Y1=Y2 and solve. **Graphing piecewise / undefined regions** tan(X) has vertical asymptotes — the calculator skips large jumps automatically so you won't see false vertical lines. 1/X works the same way. **Tips** - 2X+1 = 2*X+1 (implicit multiplication works) - X²-4 = X^2-4 (both notations work) - abs(X) graphs the V-shape absolute value function - round(X) graphs a step function