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The tools students reach for most often. If you only have a minute, start with these.
Derivative Calculator
Step-by-step differentiation with the chain, product, and quotient rules.
Open tool →Integral Calculator
Step-by-step integration with u-sub, by parts, partial fractions, and trig sub.
Open tool →Limit Calculator
Evaluate limits with L'Hôpital, factoring, and conjugate techniques.
Open tool →RREF Calculator
Reduce a matrix to row-echelon form and see every row operation.
Open tool →Quadratic Solver
Solve quadratics by factoring, completing the square, or formula — with steps.
Open tool →Slope Calculator
Find slope, line equations, and parallel/perpendicular relationships.
Open tool →Related Rates Solver
Set up and solve related-rates problems with the standard template.
Open tool →Taylor / Maclaurin Series
Build Taylor expansions around any point with error bounds.
Open tool →Matrix Inverse
Find inverses with cofactors or row reduction, step by step.
Open tool →Bellman-Ford Visualizer
Watch shortest paths and negative-weight relaxation in real time.
Open tool →MST Visualizer
Compare Kruskal and Prim algorithms building a minimum spanning tree.
Open tool →SAT Math Practice
Timed practice with the 60-Second Rule for the Digital SAT.
Open tool →SAT English Practice
Timed Reading & Writing module with the 60-Second Rule for the Digital SAT.
Open tool →Full Digital SAT
Full 4-module timed practice test: two Reading & Writing modules and two Math modules.
Open tool →Teaching Slides
233 step-by-step lesson decks across 14 subjects, revealing one idea at a time with worked examples and quick checks.
Open tool →Browse every subject
Every category is a curated set of step-by-step calculators that show how to work the problem — not just an answer box.
Algebra 1 46 tools
Equations, inequalities, linear functions, factoring, quadratics, exponent rules, and graphing.
Algebra 2 45 tools
Polynomials, rational functions, complex numbers, logarithms, conic sections, sequences, and matrices.
Algebra 53 tools
Word problems, systems, functions, and mixed algebra practice that spans Algebra 1 and 2.
Pre-Calculus 29 tools
Function transformations, advanced trig, vectors, polar coordinates, parametric equations, and limits.
Trigonometry 29 tools
Unit circle, identities, inverse trig, law of sines/cosines, complex polar form, and De Moivre's theorem.
Calculus 63 tools
Limits, derivatives, integrals, related rates, optimization, series, Taylor polynomials, and ODEs.
Differential Equations 28 tools
Separable, linear, exact, Laplace transforms, systems, slope fields, and numerical methods.
Linear Algebra 42 tools
RREF, eigenvalues, SVD, decompositions, projections, transformations, and matrix operations.
Statistics 36 tools
Distributions, hypothesis tests, regression, confidence intervals, ANOVA, and probability calculators.
Probability 30 tools
Counting, Bayes theorem, distributions, expected value, and random variables.
Geometry 32 tools
Area, perimeter, volume, angles, circles, triangles, coordinate geometry, and transformations.
Physics 36 tools
Kinematics, dynamics, energy, momentum, electromagnetism, optics, and waves.
SAT Math 24 tools
Heart of Algebra, Problem Solving, Passport to Advanced Math, Geometry, and timed practice.
GED Math 23 tools
Fractions, percents, ratios, geometry, statistics, and algebra for the GED Mathematical Reasoning test.
Cryptography 13 tools
Working ciphers you can run: Caesar, Vigenère, Hill, frequency analysis, one-time pads, hashing, RSA, Diffie-Hellman, and elliptic curves.
Frequently Asked Questions
Are the calculators really free?
Yes — every calculator and visualizer is free with no account, no email, and no paywall. They show step-by-step solutions, not just answers.
Can I use these tools in my class or homework?
Yes. They're designed to help you understand the process, not just get an answer. Many students use them alongside textbooks to check work and rebuild intuition.
Do they work on phones?
Yes. Every tool works on phone, tablet, and desktop browsers — no app required.
What if I'm still stuck after using a tool?
Bring the exact problem and the step where the tool stopped helping to a free 30-minute tutoring consultation. We'll figure out the underlying gap.