Education & Math

Graphing Calculator

Plot and visualize mathematical functions with this graphing calculator. Supports multiple functions, zoom, pan, and common math operations.

Pythagorean Theorem Calculator

Calculate the missing side of a right triangle using the Pythagorean theorem. Includes step-by-step solutions, diagrams, and a right triangle checker.

Triangle Calculator

Solve any triangle from 3 sides (SSS), 2 sides and an angle (SAS), or 2 angles and a side (ASA). Shows area, perimeter, heights, and a diagram.

Circle Calculator

Calculate circle radius, diameter, circumference, and area from any single measurement. Includes visual diagram and step-by-step formulas.

Class Grade Calculator

Calculate your weighted or unweighted grade average and see what you need on the final exam. Letter grade, percentage, and progress bar included.

Quadratic Formula Calculator

Solve any quadratic equation with this quadratic formula calculator. Shows roots, discriminant, vertex, step-by-step work, and a parabola graph.

2D Area Calculator

Calculate area and perimeter for circles, triangles, rectangles, trapezoids, parallelograms, and ellipses. Step-by-step formulas with every result.

3D Volume Calculator

Calculate volume and surface area for spheres, cylinders, cones, cubes, rectangular prisms, and pyramids. Step-by-step formulas included.

Slope Calculator

Find slope (rise over run), distance, and line equation from two points. Outputs slope-intercept, point-slope, and standard form with a visual plot.

Equation Solver

Solve linear equations, quadratic equations, and systems of two equations with this equation solver. Step-by-step solutions included.

Standard Deviation Calculator

Free standard deviation calculator for any data set. Get variance, mean, and more with population and sample modes plus step-by-step breakdowns.

Square Root Calculator

Find square roots, cube roots, and nth roots. Simplify radicals, check for perfect squares, and see if results are rational or irrational.

GPA Calculator

Calculate your GPA from letter grades and credit hours. Supports weighted, unweighted, college, and high school grade point average on a 4.0 scale.

Logarithm Calculator

Calculate logarithms in any base (log, ln, log2) with step-by-step working. Includes antilog mode and a properties reference card.

Significant Figures Calculator

Count significant figures in any number, round to N sig figs, and do arithmetic with correct significant figures. Color-coded digit breakdown.

Percent Error Calculator

Calculate percent error for chemistry and physics experiments. Shows absolute and relative error with step-by-step formula and experimental value range.

Unit Circle Reference

Explore the unit circle with this interactive tool. See sin, cos, and tan values for any angle with a visual diagram and reference table.

Circumference Calculator

Calculate circumference, diameter, radius, and area of a circle from any one value. Includes arc length and sector area tools.

Mean, Median & Mode Calculator

Enter a dataset and instantly get mean, median, mode, range, min, and max. Sorted data display with frequency table and bar chart.

Molar Mass Calculator

Calculate the molar mass of any chemical compound. Enter a formula like H2SO4 or Ca(OH)2 and get an element-by-element breakdown with mass percentages.

GCF & LCM Calculator

Find the GCF and LCM of 2 or more numbers using prime factorization. Step-by-step working with a factor comparison table.

Ratio Calculator

Solve ratios (A:B = C:?), simplify, scale up or down, and compare two ratios. Step-by-step working with a recipe scaling example.

Exponent Calculator

Calculate any base raised to any exponent with step-by-step working. Supports negative and fractional exponents with a properties reference.

Dilution Calculator

Solve C1V1 = C2V2 dilution equations instantly. Find the volume or concentration needed for any solution dilution in chemistry or biology.

Scientific Notation Calculator

Convert to and from scientific notation. Do arithmetic in scientific notation with step-by-step working. Includes engineering notation.

Probability Calculator

Calculate probability for single events, two independent events, and conditional probability. Includes visual bars, presets, and step-by-step work.

Permutations & Combinations Calculator

Calculate nPr and nCr with step-by-step factorial expansion. Toggle repetition on or off with real-world examples like lottery and PIN codes.

Prime Factorization Calculator

Break any number into its prime factors with this prime factorization calculator. Includes a factor tree, divisor list, and GCD/LCM calculator.

Long Division Calculator

See long division worked out step by step with remainder. Option to continue dividing for decimals. Shows result as a fraction too.

Matrix Calculator

Perform matrix operations with this matrix calculator. Supports addition, subtraction, multiplication, transpose, determinant, and inverse.

Factorial Calculator

Calculate n! for any positive integer with full expansion shown. Supports double factorial, subfactorial, and Stirling's approximation.

Modulo Calculator

Calculate a mod b with quotient and remainder. Step-by-step explanation with clock arithmetic visual and negative number handling.

Times Table Generator

Learn and practice multiplication with this times table generator. Includes an interactive grid, quiz mode with scoring, and difficulty levels.

Flashcard Maker

Free flashcard maker to build, flip, and study printable or online decks. Save to your browser, track progress, and review at your own pace.

Z-Score Calculator

Calculate z-scores from raw values, find probabilities and percentiles from z-scores, or reverse-calculate values. Includes a bell curve visual and z-table.

Confidence Interval Calculator

Calculate confidence intervals for means and proportions. Supports 90%, 95%, 99% or custom levels with margin of error and step-by-step formulas shown.

p-value Calculator

Calculate p-values from z, t, chi-square, or F test statistics. One-tail and two-tail options with significance interpretation at common alpha levels.

Sample Size Calculator

Determine the required sample size for surveys and research. Enter confidence level, margin of error, and population proportion to get the number you need.

Variance Calculator

Calculate population and sample variance from a dataset. See the mean, deviations table, standard deviation, and coefficient of variation step by step.

Percentile Calculator

Find the kth percentile of a dataset or what percentile a value falls in. Shows quartiles, IQR, five-number summary, outliers, and a box plot visual.

Law of Sines Calculator

Solve triangles using the law of sines (a/sinA = b/sinB = c/sinC). Handles the ambiguous SSA case with step-by-step solutions for each possibility.

Law of Cosines Calculator

Solve triangles using the law of cosines. Find a missing side from two sides and an included angle, or find angles from three sides. Shows working.

Trig Functions Calculator

Calculate sin, cos, tan, csc, sec, and cot for any angle in degrees or radians. Inverse trig functions and a unit circle reference table included.

Midpoint & Distance Calculator

Calculate the midpoint, distance, and slope between two points in 2D or 3D. Shows formulas with substituted values and an SVG coordinate plot for 2D.

Correlation Calculator

Calculate Pearson correlation coefficient, R-squared, p-value, and regression equation from paired data. Includes scatter plot with best-fit line.

Fibonacci Generator

Generate Fibonacci sequences up to N terms or a max value. See the golden ratio converge to phi and explore sequence properties.

Pascal's Triangle Generator

Generate Pascal's triangle up to N rows. Highlight even/odd patterns, view binomial coefficients, and click any number to see its nCr value.

Golden Ratio Calculator

Input any dimension to find its golden ratio pair. Explore phi (1.618) relationships for design, photography, typography, and web layout.

Stem and Leaf Plot Generator

Paste a dataset to generate a stem-and-leaf plot with summary stats. Supports back-to-back plots for comparing two datasets side by side.

Surface Area Calculator

Calculate surface area for cubes, rectangular prisms, spheres, cylinders, cones, and pyramids. Formulas shown with step-by-step substitution.

Chi-Square Calculator

Run a chi-square test of independence on any contingency table. Get the test statistic, p-value, expected frequencies, and effect size instantly.

T-Test Calculator

Run one-sample, two-sample, or paired t-tests on your data. Get the t-statistic, p-value, confidence interval, and a t-distribution curve.

Normal Distribution Calculator

Calculate probabilities from a normal distribution. Enter mean, standard deviation, and x-values to find areas under the bell curve.

ANOVA Calculator

Run a one-way ANOVA test on 2 to 10 groups. Get the F-statistic, p-value, effect size, and a full ANOVA summary table instantly.

Regression Calculator

Run simple linear regression on your data. Get the equation, R-squared, scatter plot with best-fit line, residuals, and predictions.