Every formula, geometry, and stats calc you ever needed.
School essentials, algebra + calculus, geometry, and statistics — the math you needed in school plus the math you wish you'd kept.
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All 175 math calculators, A-Z
Filter by name, or open a topic to see what's inside. Every tool in this category is listed here.
General Math · 53
Geometry · 41
Linear Algebra · 10
Number Theory · 3
School · 2
Statistics · 59
Hand-picked starters.
The 2 calculators every student needs.
GPA tracking and grade-needed math — back-solve what you need on the final.
Bigger than one calculator? Follow the flow.
Multi-step paths that string the right math tools together in the order most people actually use them — with your numbers carried from step to step.
Algebra, calculus, and the everyday math.
Percentages, fractions, quadratics, derivatives, integrals, and the matrices + logarithms that come up in real problems.
Percentage
Drag value and percent. The widget computes "X% of Y" and "Y is what % of Z" plus % increase / decrease.
Fraction Calculator
Add, subtract, multiply, divide, and simplify fractions — with decimal equivalents and LCD work shown.
¾ + ½= 1¼ = 1.25Areas, volumes, and right-triangle math.
Circles, triangles, polygons, volumes, slopes, and the distance / Pythagorean lookups every geometry student does.
Circles, spheres, and cylinders — every area and volume tool here starts with pi.
Circle Calculator
Drag the radius. Area, circumference, and diameter update live with the exact + decimal forms.
Triangle Calculator
Solve any triangle with 3 known values — sides + angles + area, with law of sines/cosines work shown.
3-4-5 trianglearea = 6Distributions, p-values, and inference.
Z-scores, confidence intervals, hypothesis tests, sample sizes, regression, and descriptive stats — the AP / college-stats toolkit.
Z-Score
Drag value, mean, and standard deviation. The widget computes z + the corresponding normal-distribution percentile.
Standard Deviation
Compute σ (population) and s (sample) with full work shown — variance, deviations, and SE of the mean.
σ = 14.410-value test setVectors, matrices, triangles, and number theory.
Matrix operations and decompositions, dot and cross products and projections, trigonometric identities and triangle solving, plus modular arithmetic and classical number-theory functions.
The math vocabulary, decoded.
Every definition links to the calculator that puts the term to work. Browse the full glossary →
z = (x − μ) / σThe z-score — how many standard deviations a data point sits from the mean. The gateway to every normal-distribution lookup.A = πr²Area of a circle — the most-reached-for geometry formula, from pizza math to pipe cross-sections.% change = (new − old) / old × 100Percent change — the everyday comparison formula behind raises, discounts, and growth rates.Frequently asked questions
Do the math calculators show work, or just the answer?
Every math calculator shows the step-by-step work — formula identification, substitution, simplification, and final answer. The widget shows just the final result; the full calculator (one click away) shows every step. The work is the point; without it, you can't catch your own mistakes when the answer doesn't look right.
What math notation does the site use?
Standard U.S. textbook notation. Exponents as `x²` or `x^2`, square roots as `√x`, fractions as `a/b` or `a÷b`, percentages as `25%` or `0.25`. The Derivative and Integral calculators accept MathJax-like input. Where ambiguity exists (e.g., `log` is base-10 vs `ln` is base-e), the calculator footer clarifies.
Z-score vs. T-score — when to use which?
Z-score: when σ (population standard deviation) is known OR sample size n ≥ 30. T-score: when σ is estimated from the sample AND n < 30. The Z-Score widget assumes you know σ; the Hypothesis Test and Confidence Interval calculators let you pick t- or z-based depending on your inputs.
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