Math Calculators
Percentages, discounts and a full scientific calculator.
Percentage Calculator
Percent of, percent change, and add/subtract a percentage instantly.
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Scientific Calculator
Full keypad with trig, powers, roots, logs, parentheses and memory.
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Fraction Calculator
Add, subtract, multiply and divide fractions with a simplified result.
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Standard Deviation
Mean, variance, standard deviation and count for a set of numbers.
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Random Number Generator
Generate random numbers in a range, with or without duplicates.
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Average / Mean
Mean, median, mode, range and sum for any list of numbers.
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Triangle Solver
Angles, area, perimeter and type of a triangle from its three sides.
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Significant Figures
Count significant figures and round a number to a chosen precision.
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Ratio Calculator
Simplify a ratio, get its decimal value and scale it to a new term.
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Number Base Converter
Convert between binary, octal, decimal and hexadecimal instantly.
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Density Calculator
Solve density, mass or volume with ρ = m / V.
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Probability Calculator
P(A and B), P(A or B), P(neither) for two independent events.
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Half-Life Calculator
Remaining quantity after decay from initial amount, half-life and elapsed time.
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Logarithm Calculator
Logarithm of any value to any base, plus natural, log₁₀ and log₂.
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Root Calculator
nth root of a number, plus square and cube roots.
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Exponent Calculator
Raise any base to any power, with squares and cubes.
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Quadratic Formula Solver
Solve ax² + bx + c = 0 with real or complex roots and the discriminant.
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Slope Calculator
Slope, y-intercept and angle of the line through two points.
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Distance Calculator
Straight-line distance between two points on a plane.
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Midpoint Calculator
The midpoint of a line segment between two coordinates.
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Circle Calculator
Area, circumference and diameter of a circle from its radius.
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Pythagorean Theorem
Find the hypotenuse or a missing leg of a right triangle.
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LCM & GCF Calculator
Least common multiple and greatest common factor of two numbers.
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Factorial Calculator
Compute n! for any non-negative integer.
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Permutation & Combination
nPr and nCr — count ordered arrangements and unordered selections.
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Percentage Change
Percent increase or decrease between an old and new value.
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Z-Score Calculator
Standard score and percentile of a value in a normal distribution.
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Modulo Calculator
Remainder and quotient of a division (a mod n).
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Proportion Calculator
Solve A/B = C/X for the missing term by cross-multiplication.
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Rounding Calculator
Round a number to any number of decimal places, up, down or nearest.
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Variance Calculator
Sample or population variance and standard deviation of a data set.
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Percentile Calculator
The nth percentile of a data set with min, median and max.
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Confidence Interval
Confidence interval for a mean from sample size and standard deviation.
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Sample Size Calculator
Survey sample size needed for a target margin of error and confidence.
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Margin of Error
Margin of error for a survey from sample size, proportion and confidence.
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Binomial Probability
Exact and cumulative binomial probabilities for n trials.
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Arithmetic Sequence
The nth term and sum of an arithmetic sequence.
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Geometric Sequence
The nth term and sum of a geometric sequence.
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Exponential Growth
Growth or decay of a value over a number of periods.
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Scientific Notation
Convert a number to scientific, engineering and E-notation.
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Decimal to Fraction
Convert a decimal into its simplest fraction.
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Fraction to Decimal
Convert a fraction into a decimal and percentage.
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Weighted Average
Weighted mean of values with matching weights.
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Golden Ratio Calculator
Split a length into the golden ratio (φ ≈ 1.618).
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Odds to Probability
Convert betting odds into win probability and decimal odds.
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Geometric Mean
Geometric mean of a set of positive numbers.
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Sphere Calculator
Volume, surface area and diameter of a sphere from its radius.
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Cube Calculator
Volume, surface area and diagonal of a cube.
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Cylinder Calculator
Volume, surface area and lateral area of a cylinder.
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Cone Calculator
Volume, surface area and slant height of a cone.
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Rectangular Box Calculator
Volume, surface area and diagonal of a rectangular prism.
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Pyramid Calculator
Volume, surface area and slant height of a square pyramid.
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Ellipse Calculator
Area, circumference and eccentricity of an ellipse.
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Trapezoid Calculator
Area and median of a trapezoid from its parallel sides and height.
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Parallelogram Calculator
Area of a parallelogram from base and height.
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Regular Polygon Calculator
Area, perimeter, apothem and interior angle of a regular polygon.
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Linear Regression
Best-fit line (slope, intercept), correlation and R² from x/y data.
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Correlation Calculator
Pearson correlation coefficient (r) between two data sets.
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Covariance Calculator
Sample and population covariance between two variables.
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Quartile & IQR Calculator
Five-number summary: min, Q1, median, Q3, max and the IQR.
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Coefficient of Variation
Relative variability (CV) of a data set as a percentage.
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Standard Error Calculator
Standard error of the mean from a sample of numbers.
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Harmonic Mean
Harmonic mean of a set of positive numbers.
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Root Mean Square (RMS)
The root mean square of a set of numbers.
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Prime Number Checker
Check if a number is prime and see its prime factorization.
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Fibonacci Calculator
The nth Fibonacci number and the sequence up to it.
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Triangle Area Calculator
Area of a triangle from its base and height.
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3D Distance Calculator
Straight-line distance between two points in 3D space.
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Rectangle Calculator
Area, perimeter and diagonal of a rectangle.
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Square Calculator
Area, perimeter and diagonal of a square.
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Rhombus Calculator
Area, side and perimeter of a rhombus from its diagonals.
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Hexagon Calculator
Area, perimeter and apothem of a regular hexagon.
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Circle Sector Calculator
Sector area, arc length and chord of a circle.
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Annulus (Ring) Calculator
Area and width of a ring between two concentric circles.
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Torus Calculator
Volume and surface area of a torus (donut).
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Triangular Prism Calculator
Volume of a triangular prism from base, height and length.
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T-Test Calculator (One-Sample)
One-sample t-statistic and degrees of freedom for a hypothesis test.
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Two-Sample T-Test
Welch's t-test comparing the means of two independent groups.
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Mean Absolute Deviation
Average absolute distance of values from the mean (MAD).
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Midrange Calculator
The midrange (min + max) / 2 of a data set.
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Sum of Squares
Total squared deviation from the mean.
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Mode Calculator
The most frequent value(s) in a data set.
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Range Calculator
The range, minimum and maximum of a data set.
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Outlier Calculator
Detect outliers with the 1.5 × IQR rule.
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Frustum Calculator
Volume and surface area of a conical frustum.
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Ellipsoid Calculator
Volume and surface area of a triaxial ellipsoid.
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Hemisphere Calculator
Volume and surface area of a hemisphere.
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Spherical Cap Calculator
Volume and curved area of a spherical cap.
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Capsule Calculator
Volume and surface area of a capsule (pill) shape.
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Pentagon Calculator
Area and perimeter of a regular pentagon.
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Octagon Calculator
Area and perimeter of a regular octagon.
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Kite Area Calculator
Area of a kite from its two diagonals.
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ANOVA Calculator (One-Way)
One-way analysis of variance F-statistic and ANOVA table from group data.
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Chi-Square Calculator
Chi-square goodness-of-fit statistic from observed and expected counts.
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Dodecahedron Calculator
Volume and surface area of a regular dodecahedron from its edge.
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Octahedron Calculator
Volume and surface area of a regular octahedron from its edge.
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Tetrahedron Calculator
Volume, surface area and height of a regular tetrahedron.
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Hollow Cylinder Calculator
Material volume and surface area of a tube from outer and inner radius.
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Change of Base Logarithm
Logarithm in any base plus natural, log₁₀ and log₂ via change of base.
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2×2 Matrix Determinant
Determinant and inverse of a 2×2 matrix (ad − bc).
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Vector Magnitude Calculator
Magnitude and unit vector of a 2D or 3D vector.
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GCD & LCM of a List
Greatest common divisor and least common multiple of several numbers.
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