Tools

Everything here is free, needs no account, and runs entirely in your browser. Nothing you type is sent to a server, so your work stays on your own device.

• Graphing calculator

  Plot functions and equations, animate parameters, find roots and intersections, export for printing.

• Statistics calculator

  Summary statistics, histograms and box plots, distributions, confidence intervals and hypothesis tests.

• Derivative calculator

  Derivatives with the working shown, integrals, turning points and inflections, and limits, all from one expression.

What each one is for

Graphing calculator

Plot functions, equations, inequalities and implicit curves. Add sliders to any parameter and watch the curve respond. Find roots, turning points and intersections to full precision rather than reading them off a pixel. Fit regression models to your own data. Export a graph as a vector SVG that prints cleanly, or share it as a link that carries the whole state.

Statistics calculator

One- and two-variable summary statistics with histograms and box plots. Probabilities from the normal, t, chi-square, binomial and Poisson distributions, with the region shaded so you can see you asked the right question. Confidence intervals and hypothesis tests that show the working — standard error, critical value, degrees of freedom — and list the conditions each procedure assumes.

Still to come

These are planned. They are listed here so it is clear what does not exist yet rather than implied by omission.

• Matrix calculator with row operations shown step by step.
• Derivatives and integrals with the working, not just the answer.
• 3D surface plotting for functions of two variables.
• Equation solver that shows how it got there.

Learn how to use them

The guides work through the topics these tools are for, with worked examples and graphs you can open and change.

• How to graph a parabola

  Standard, vertex and factored form, and how to read the vertex, intercepts and direction off each one.

• Finding intercepts

  What the intercepts mean, three ways to find them, and how to get exact values instead of estimates.

• Domain and range

  Reading both off a curve, writing them in interval notation, and the endpoint cases that cost marks.

All guides →