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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Math shows up everywhere — splitting a bill, working out a discount, checking a statistics assignment, or converting a number between bases for a coding project. Our math calculators cover the everyday and the technical, and they always show the working, not just the answer, so you actually understand how the result was reached.
Each tool is designed to double as a quick reference. Alongside the instant answer you will find the formula, worked steps and, where it helps, a chart or table. That makes these pages just as handy for a student checking their method as for anyone who simply needs a fast, reliable calculation.
What you can do with our math calculators
- Calculate percentages, percentage change and percentage-off discounts
- Solve averages, means, ratios and fractions with the steps shown
- Use a full scientific calculator for trig, logs and exponents
- Convert numbers between binary, octal, decimal and hexadecimal