Math
Geometry, algebra, statistics and number tools — from square roots to quadratic equations.
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Rule of Three Calculator
Solve a proportion: if A relates to B, then C relates to X.
What Percent Is X of Y
Find what percentage one number is of another.
Quadratic Equation Solver
Solve ax² + bx + c = 0 for real or complex roots.
Percentage to Decimal Converter
Convert a percentage to a decimal and a fraction.
2×2 Matrix Determinant Calculator
Calculate the determinant of a 2×2 matrix.
2×2 Matrix Addition Calculator
Add two 2×2 matrices together.
2×2 Matrix Multiplication Calculator
Multiply two 2×2 matrices.
2×2 Matrix Transpose Calculator
Find the transpose of a 2×2 matrix.
Complex Number Calculator
Add, subtract or multiply two complex numbers.
Cubic Equation Solver
Solve a cubic equation ax³ + bx² + cx + d = 0.
Distance Formula Calculator
Find the distance between two points.
Law of Cosines Calculator
Find the third side of a triangle using the law of cosines.
Law of Sines Calculator
Find an unknown side using the law of sines.
Heron’s Formula Calculator
Find a triangle’s area from its three sides.
SOHCAHTOA Calculator
Solve a right triangle from two sides.
Antilog Calculator
Calculate the antilogarithm (inverse log).
Percent Error Calculator
Calculate percent error between measured and true values.
Summation Calculator
Sum a range of integers with a step.
Polar to Cartesian Calculator
Convert polar coordinates to cartesian (x, y).
Cartesian to Polar Calculator
Convert cartesian coordinates to polar (r, θ).
Vector Addition Calculator
Add two 2D vectors and find the resultant.
Unit Vector Calculator
Find the unit vector of a 2D vector.
Angle Between Vectors Calculator
Find the angle between two 2D vectors.
3D Distance Calculator
Find the distance between two 3D points.
Perpendicular Slope Calculator
Find the slope perpendicular to a given slope.
Line Equation from Two Points
Find the equation of a line through two points.
Completing the Square Calculator
Rewrite a quadratic in vertex form.
Remainder Theorem Calculator
Evaluate a polynomial at a value of x.
Proportion Solver
Solve a proportion a/b = c/x for the missing value.
Percentage Difference Calculator
Find the percentage difference between two numbers.
Natural Log Calculator
Calculate the natural logarithm and related values.
Significant Figures Calculator
Round a number to a set number of significant figures.
Radical Simplifier
Simplify a square root into simplest radical form.
Square Pyramid Volume Calculator
Calculate the volume of a square pyramid.
2D Cross Product Calculator
Calculate the scalar cross product of two 2D vectors.
Scalar Triple Product Calculator
Calculate a·(b×c) for three 3D vectors.
Matrix Scalar Multiplication Calculator
Multiply a 2×2 matrix by a scalar.
Centroid of a Triangle Calculator
Find the centroid of a triangle from its vertices.
Slope Percentage Calculator
Convert rise and run to a slope percentage and angle.
Arithmetic Series Sum Calculator
Sum the first n terms of an arithmetic series.
Geometric Series Sum Calculator
Sum the first n terms of a geometric series.
Nth Term (Arithmetic) Calculator
Find the nth term of an arithmetic sequence.
Nth Term (Geometric) Calculator
Find the nth term of a geometric sequence.
Binary Addition Calculator
Add two numbers and see the result in binary.
Binary Subtraction Calculator
Subtract two numbers and see the result in binary.
Two’s Complement Calculator
Find the two’s complement binary of a number.
Regular Pentagon Area Calculator
Calculate the area of a regular pentagon.
Regular Octagon Area Calculator
Calculate the area of a regular octagon.
2×2 Matrix Inverse Calculator
Calculate the inverse of a 2×2 matrix.
2×2 Eigenvalues Calculator
Find the eigenvalues of a 2×2 matrix.
3×3 Matrix Determinant Calculator
Calculate the determinant of a 3×3 matrix.
3D Dot Product Calculator
Calculate the dot product of two 3D vectors.
3D Cross Product Calculator
Calculate the cross product of two 3D vectors.
Vector Projection Calculator
Project one 2D vector onto another.
Distance from Point to Line Calculator
Find the distance from a point to a line ax+by+c=0.
Area of Triangle from Coordinates
Find a triangle’s area from its three vertices.
Collinear Points Checker
Check whether three points lie on the same line.
Perpendicular Bisector Calculator
Find the perpendicular bisector of a segment.
Sum and Product of Roots Calculator
Find the sum and product of a quadratic’s roots.
Long Division Calculator
Divide two numbers to get a quotient and remainder.
Continued Fraction Calculator
Express a decimal as a continued fraction.
Harmonic Series Sum Calculator
Sum the first n terms of the harmonic series.
Multinomial Coefficient Calculator
Calculate a multinomial coefficient.
Stars and Bars Calculator
Count ways to distribute items into bins.
Catalan Number Calculator
Calculate the nth Catalan number.
Triangular Number Calculator
Calculate the nth triangular number.
Pentagonal Number Calculator
Calculate the nth pentagonal number.
Perfect Number Checker
Check whether a number is perfect.
Collatz Sequence Calculator
Compute the Collatz (3n+1) sequence length.
Digital Root Calculator
Find the digital root of a number.
Number of Divisors Calculator
Count how many divisors a number has.
Aliquot Sum Calculator
Sum the proper divisors of a number.
Euler’s Totient Calculator
Count integers coprime to a number.
Happy Number Checker
Check whether a number is a happy number.
Narcissistic Number Checker
Check if a number equals the sum of its digits raised to its length.
Palindrome Number Checker
Check whether a number is a palindrome.
Exponent Calculator
Raise a base to any power.
Root Calculator
Find the square, cube or nth root of a number.
Factorial Calculator
Calculate the factorial (n!) of a whole number.
Rounding Calculator
Round a number to decimals or the nearest multiple.
Scientific Notation Converter
Convert numbers to and from scientific notation.
Logarithm Calculator
Calculate logarithms with any base.
Circle Calculator
Calculate area, circumference and diameter from the radius.
Triangle Area Calculator
Calculate the area of a triangle from base and height.
Cylinder Volume Calculator
Calculate the volume and surface area of a cylinder.
Sphere Volume Calculator
Calculate the volume and surface area of a sphere.
Pythagorean Theorem Calculator
Find the hypotenuse from two right-triangle sides.
Slope Calculator
Calculate the slope between two points.
Distance Between Two Points
Calculate the distance between two coordinates.
Prime Number Checker
Check whether a number is prime and list its factors.
Modulo Calculator
Find the remainder of a division (a mod b).
Permutation & Combination Calculator
Calculate nPr and nCr.
Arithmetic Sequence Calculator
Find the nth term and sum of an arithmetic sequence.
Geometric Mean Calculator
Calculate the geometric mean of a set of numbers.
Square & Square Root Calculator
Find the square and square root of a number.
Cube & Cube Root Calculator
Find the cube and cube root of a number.
Reciprocal Calculator
Find the reciprocal (1/x) of a number.
Absolute Value Calculator
Find the absolute value of a number.
Percentage Increase Calculator
Increase a number by a percentage.
Percentage Decrease Calculator
Decrease a number by a percentage.
Triangle Height Calculator
Find a triangle’s height from its area and base.
Diameter from Circumference
Find a circle’s diameter and radius from its circumference.
Sphere Radius from Volume
Find a sphere’s radius from its volume.
Cube Side from Volume
Find a cube’s side length from its volume.
Rectangle Diagonal Calculator
Find the diagonal of a rectangle.
Equilateral Triangle Calculator
Find area, height and perimeter of an equilateral triangle.
Polygon Interior Angle Calculator
Find the interior angle of a regular polygon.
Polygon Diagonals Calculator
Count the diagonals of a polygon.
Even or Odd Checker
Check whether a number is even or odd.
Round to Nearest Calculator
Round a number to the nearest 5, 10, 100 and more.
Sum of Squares Calculator
Calculate the sum of squares of numbers.
Product Calculator
Multiply several numbers together.
Vector Magnitude Calculator
Find the magnitude of a 3D vector.
Dot Product Calculator
Calculate the dot product of two 3D vectors.
Scale Factor Calculator
Find the scale factor between two lengths.
Map Scale Calculator
Convert map distance to real-world distance.
Significant Figures Rounder
Round a number to a set number of significant figures.
Exponential Decay Calculator
Model exponential decay over time.
Collatz Conjecture Calculator
Count the steps for a number to reach 1.
Digit Sum Calculator
Add up the digits of a number.
Reverse Number Calculator
Reverse the digits of a number.
Armstrong Number Checker
Check if a number is an Armstrong (narcissistic) number.
Discriminant Calculator
Calculate the discriminant of a quadratic equation.
Slope-Intercept Calculator
Find the equation y = mx + b from two points.
Distance, Rate & Time Calculator
Solve for distance from rate and time.
Percentage Points Calculator
Find the difference in percentage points.
Mixed Number to Improper Fraction
Convert a mixed number into an improper fraction.
Improper Fraction to Mixed Number
Convert an improper fraction into a mixed number.
Percent to Fraction Converter
Convert a percentage to a simplified fraction.
Decimal to Fraction Converter
Convert a decimal to a simplified fraction.
GCF of Three Numbers
Find the greatest common factor of three numbers.
LCM of Three Numbers
Find the least common multiple of three numbers.
Sum of Consecutive Numbers
Sum all integers in a range.
3D Midpoint Calculator
Find the midpoint of two 3D points.
Direction Angle Calculator
Find the angle of a vector from the x-axis.
Polar to Cartesian Calculator
Convert polar coordinates to Cartesian (x, y).
Cartesian to Polar Calculator
Convert Cartesian coordinates to polar (r, θ).
Pythagorean Triple Checker
Check if three numbers form a Pythagorean triple.
Cross Product Magnitude (2D)
Find the magnitude of the 2D cross product of two vectors.
Combination Lock Calculator
Count the possible combinations of a lock.
Percentage Error Calculator
Calculate the percent error between a measured and true value.
Z-Score Calculator
Find how many standard deviations a value is from the mean.
Rectangle Area Calculator
Calculate the area and perimeter of a rectangle.
Trapezoid Area Calculator
Calculate the area of a trapezoid.
Parallelogram Area Calculator
Calculate the area of a parallelogram.
Cone Volume Calculator
Calculate the volume of a cone.
Cube Volume Calculator
Calculate the volume and surface area of a cube.
Box (Rectangular Prism) Volume Calculator
Calculate the volume of a box.
Radius From Area Calculator
Find a circle’s radius from its area.
Mixed Number to Decimal
Convert a mixed number to a decimal.
3D Distance Calculator
Calculate the distance between two 3D points.
Midpoint Calculator
Find the midpoint between two points.
Sum of First N Numbers
Sum all whole numbers from 1 to n.
Fibonacci Calculator
Find the nth Fibonacci number.
Golden Ratio Calculator
Split a length by the golden ratio (φ ≈ 1.618).
Harmonic Mean Calculator
Calculate the harmonic mean of three numbers.
Weighted Average Calculator
Calculate a weighted average of two values.
Quadratic Vertex Calculator
Find the vertex of a parabola y = ax² + bx + c.
Exponential Growth Calculator
Project growth or decay over time.
Half-Life Calculator
Find the remaining quantity after radioactive decay.
Hexagon Area Calculator
Calculate the area of a regular hexagon.
Pentagon Area Calculator
Calculate the area of a regular pentagon.
Ellipse Area Calculator
Calculate the area of an ellipse.
Circle Sector Area Calculator
Calculate the area of a circular sector.
Arc Length Calculator
Calculate the length of a circular arc.
Regular Polygon Area Calculator
Calculate the area of any regular polygon.
Triangle Perimeter Calculator
Calculate the perimeter and area of a triangle from its three sides.
Standard Deviation Calculator
Calculate the standard deviation and variance of numbers.
Variance Calculator
Calculate the variance of a set of numbers.
Trigonometry Calculator
Find sine, cosine and tangent of an angle.
Inverse Trigonometry Calculator
Find arcsin, arccos and arctan of a value.
Right Triangle Calculator
Solve a right triangle from its two legs.
Square Calculator
Find the area, perimeter and diagonal of a square.
Pyramid Volume Calculator
Calculate the volume of a rectangular pyramid.
Rhombus Area Calculator
Calculate the area of a rhombus from its diagonals.
Annulus (Ring) Area Calculator
Calculate the area of a ring between two circles.
Cone Surface Area Calculator
Calculate the surface area of a cone.
Divisors Calculator
Find all the divisors of a number.
Sum of Divisors Calculator
Find the sum of all divisors of a number.
Perfect Number Checker
Check if a number equals the sum of its proper divisors.
Geometric Sequence Calculator
Find the nth term of a geometric sequence.
Geometric Series Sum Calculator
Find the sum of a geometric series.
Binomial Probability Calculator
Calculate binomial probability P(X=k).
Mean Absolute Deviation Calculator
Calculate the mean absolute deviation of numbers.
Range Calculator
Find the range, min and max of numbers.
Midrange Calculator
Find the midrange (average of min and max).
Percentage Difference Calculator
Calculate the percentage difference between two values.
Simplify Fraction Calculator
Reduce a fraction to its simplest form.
Add Fractions Calculator
Add two fractions and simplify the result.
Multiply Fractions Calculator
Multiply two fractions and simplify.
Decimal to Percent Converter
Convert a decimal to a percentage.
Coefficient of Variation Calculator
Calculate the coefficient of variation from mean and SD.
Combinations with Repetition Calculator
Count combinations where items can repeat.