Math Calculators
General math, statistics, geometry, and scientific calculators.
General Math
Fractions, percentages, exponents, logarithms, and number operations.
Big Number Calculator
Calculate result of arithmetic operation from Two large numbers, Operation, with the key formulas and caveats needed to interpret the result correctly.
Binary Calculator
Calculate number converted to binary, hex, or octal from Decimal number, Target base, with the key formulas and caveats needed to interpret the result correctly.
Conversion Calculator
Convert common length measurements or temperatures and keep the unit relationship visible instead of treating every conversion as interchangeable.
Density Calculator
Calculate third quantity from Two of: density, mass, volume, with the key formulas and caveats needed to interpret the result correctly.
Exponent Calculator
Calculate base raised to the exponent power from Base, Exponent, with the key formulas and caveats needed to interpret the result correctly.
Factor Calculator
Calculate all factors and prime factorization from Integer, with the key formulas and caveats needed to interpret the result correctly.
Fraction Calculator
Calculate simplified fraction and decimal equivalent from Numerator 1, Denominator 1, Operation, Numerator 2, Denominator 2, with the key formulas and caveats needed to interpret the result correctly.
GDP Calculator
Calculate gdp and gdp per capita from Consumption, Investment, Government spending, Exports, Imports, with the key formulas and caveats needed to interpret the result correctly.
Greatest Common Factor Calculator
Calculate gcf value from Two or more integers, with the key formulas and caveats needed to interpret the result correctly.
Half-Life Calculator
Calculate remaining quantity from Initial quantity, Half-life, Time elapsed, with the key formulas and caveats needed to interpret the result correctly.
Hex Calculator
Calculate value in all number bases from Number, Input base, with the key formulas and caveats needed to interpret the result correctly.
Least Common Multiple Calculator
Calculate lcm value from Two or more integers, with the key formulas and caveats needed to interpret the result correctly.
Log Calculator
Calculate logarithm value from Number, Base, with the key formulas and caveats needed to interpret the result correctly.
Mass Calculator
Calculate converted mass from Mass value, From unit, To unit, with the key formulas and caveats needed to interpret the result correctly.
Matrix Calculator
Calculate determinant, inverse, and operations from 2×2 matrix entries, with the key formulas and caveats needed to interpret the result correctly.
Molarity Calculator
Calculate molarity in mol/l from Moles of solute, Volume of solution, with the key formulas and caveats needed to interpret the result correctly.
Molecular Weight Calculator
Calculate molecular weight in g/mol from Compound selection, with the key formulas and caveats needed to interpret the result correctly.
Percent Error Calculator
Enter measured and theoretical values to see the absolute difference, signed difference, and percent error behind the comparison.
Percentage Calculator
Three percentage calculations in one place: find X% of a number, determine what percentage A is of B, or calculate the percentage change from one value to another. Each mode shows the formula and result with worked examples.
Quadratic Formula Calculator
Enter coefficients a, b, and c to calculate real or complex roots, the discriminant, and the parabola vertex.
Random Number Generator
Choose a minimum, maximum, and count to generate fresh random integers for games, sampling, or simple simulations.
Ratio Calculator
Enter two ratio parts and a comparison value to simplify the ratio, read equivalent forms, and solve the missing side of a proportion.
Roman Numeral Converter
Enter an integer from 1 to 3999 to convert it into Roman numerals using the standard additive and subtractive symbols.
Root Calculator
Enter a number and root degree to calculate the nth root, inspect common roots, and verify when a negative input leads to an imaginary result.
Rounding Calculator
Enter a number and decimal-place setting to compare the main rounded result with truncation, ceiling, and floor behavior.
Scientific Calculator
Run common scientific math operations in one place: square root, square, cube, log base 10, natural log, sine, cosine, tangent, and absolute value. Trigonometric inputs are interpreted in degrees.
Scientific Notation Calculator
Enter a number to rewrite it as a coefficient times a power of ten and compare the standard and e-notation forms.
Speed Calculator
Choose the unknown value, enter the other two, and calculate speed, distance, or travel time with the matching unit conversions.
Weight Calculator
Enter one weight and unit to compare kilograms, pounds, stones-plus-pounds, and grams without manual conversion.
Statistics
Standard deviation, probability, sample size, and z-score calculators.
Confidence Interval Calculator
Calculate confidence interval range from Sample mean, Standard deviation, Sample size, Confidence level, with the key formulas and caveats needed to interpret the result correctly.
Mean, Median, Mode, Range Calculator
Enter up to six values to compare average, middle value, most frequent value, spread, and total count in one view.
Number Sequence Calculator
Calculate nth term and sum of sequence from First term, Common difference or ratio, Number of terms, with the key formulas and caveats needed to interpret the result correctly.
Permutation and Combination Calculator
Enter total items and chosen items to compare ordered arrangements with unordered selections using the matching factorial formulas.
Probability Calculator
Enter favorable and total outcomes for two events to compare probability, complement, and independent AND/OR combinations.
Sample Size Calculator
Enter confidence level, margin of error, and population size to estimate how many responses a simple proportion survey needs.
Standard Deviation Calculator
Enter five values to compare average spread for a full population versus a sample taken from a wider population.
Statistics Calculator
Enter eight values to summarize center and spread with mean, median, quartiles, IQR, standard deviation, and range.
Z-Score Calculator
Enter a data point, mean, and standard deviation to see how many standard deviations the point sits from the mean.
Geometry
Area, volume, triangle, circle, distance, and shape calculators.
Area Calculator
Calculate the area of common 2D shapes using the correct formula for rectangles, squares, circles, triangles, and trapezoids. Keep the same unit for every dimension so the result is a true square-unit measurement.
Circle Calculator
Calculate circle measurements from Radius or diameter, with the key formulas and caveats needed to interpret the result correctly.
Cone Calculator
Enter the base radius and perpendicular height to get cone volume, slant height, lateral surface area, and total surface area. The height is the straight distance from base center to apex, not the slant.
Cube Calculator
Enter the side length to instantly calculate volume, surface area, face diagonal, and space diagonal of a cube. All six faces of a cube are equal squares, so one number describes the entire shape.
Cylinder Calculator
Enter radius and height to calculate cylinder volume, total surface area, and lateral surface area. Use radius (not diameter) — divide any measured diameter by 2 before entering.
Distance Calculator
Calculate euclidean distance from Two coordinate points, with the key formulas and caveats needed to interpret the result correctly.
Ellipse Calculator
Enter the semi-major axis (a) and semi-minor axis (b) to calculate the area, perimeter, and eccentricity of an ellipse. The perimeter uses Ramanujan's accurate approximation — there is no exact closed-form formula.
Parallelogram Calculator
Enter the base, the adjacent side, and the perpendicular height to calculate area and perimeter. The height is the distance between the two parallel bases measured at 90°, not the slant length of the side.
Pythagorean Theorem Calculator
Solve for any missing side of a right triangle: find the hypotenuse from both legs, or find a missing leg from the hypotenuse and the other leg. Enter two known sides and the calculator does the rest.
Rectangle Calculator
Enter the length and width to get area, perimeter, and diagonal in one step. Keep both dimensions in the same unit for a correct squared-unit area result.
Rectangular Prism Calculator
Enter length, width, and height to calculate volume, total surface area, and space diagonal of a rectangular prism (cuboid). Use the same unit for all three dimensions.
Right Triangle Calculator
Enter the two perpendicular legs to calculate the hypotenuse, both acute angles, area, and total perimeter.
Slope Calculator
Enter two points to calculate slope, line equation, distance between points, and whether the line rises, falls, stays horizontal, or is vertical.
Sphere Calculator
Enter the sphere radius to instantly get volume, surface area, and diameter. All sphere properties depend on a single measurement.
Square Calculator
Enter the side length to instantly get area, perimeter, diagonal, and inscribed circle radius. All four sides of a square are equal, so one number describes the whole shape.
Surface Area Calculator
Choose a 3D shape, enter its dimensions, and calculate the total exposed area in square units.
Trapezoid Calculator
Enter the two parallel sides, the perpendicular height, and the two non-parallel legs to calculate area and perimeter. The height must be the perpendicular distance between the parallel sides, not the slanted leg length.
Triangle Calculator
Enter three side lengths to verify triangle validity and calculate area, perimeter, interior angles, and type.
Volume Calculator
Calculate the volume of spheres, cubes, cylinders, cones, and rectangular prisms. Enter dimensions in one unit system and read the result as cubic units, with liter guidance when dimensions are in centimeters.
