About CalculusSolver

CalculusSolver is a free library of calculus calculators built for students, tutors, and self-learners who want more than a bare final answer. Every tool on this site is designed around one idea: a calculator should help you understand a problem, not replace the work of solving it.

Why We Built This

Calculus is a subject where small procedural mistakes — a dropped negative sign in a chain rule, a misapplied product rule, an off-by-one error in a Riemann sum — are extremely common and extremely hard to catch on your own. Most calculators online either hide their steps behind a paywall or skip them entirely, which means you can check whether your final answer matches but not where your process went wrong. CalculusSolver shows the steps for free, on every tool, because that's the part that actually helps you learn.

How the Calculators Work

Every calculator runs entirely client-side, in your browser, using a custom expression parser and symbolic math engine written specifically for this site. When you type a function, it's parsed into a structured representation, differentiated or integrated using the same rules you'd apply by hand — the power rule, product rule, chain rule, and so on — and then simplified into readable notation. Where a closed-form symbolic result isn't available (which happens with some integrals and most limits at removable discontinuities), the tools fall back to careful numerical methods like Simpson's rule or bisection root-finding, and they say so, rather than pretending to a precision they don't have.

What's Available Today

The current library covers core Calculus I and II topics: derivatives (including implicit and partial derivatives), indefinite and definite integrals, limits, Taylor series, critical points, concavity, arc length, and Riemann sums. We're actively building toward a much larger library — full coverage of integration techniques, differential equations, vector calculus, and more — organized by topic on the All Tools page.

A Note on Accuracy

These tools are built and tested carefully, including automated checks that verify every symbolic derivative and integral against independent numerical calculations. That said, no calculator is a substitute for understanding — always double-check results against your course material, and treat CalculusSolver as a way to verify and learn from your work, not as the final word.

Get in Touch

Found a bug, have a tool request, or want to suggest an improvement? Visit the Contact page — we read every message.