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Math Calculators

Practical tools for school, work, and everyday number problems

Decimal to Fraction Calculator

Convert a decimal number into a simplified fraction with denominators up to 10,000.

Percent Change Calculator

Calculate percent change from an old value to a new value, with direction.

Percentage Calculator

Calculate percentages, increases, and decreases.

Pythagorean Theorem Calculator

Find any missing side of a right triangle from the other two using a² + b² = c².

Quadratic Formula Calculator

Solve quadratic equations using the quadratic formula.

Scientific Calculator

Perform advanced scientific calculations.

Sine Calculator

Calculate the sine of an angle in degrees or radians.

Slope Calculator

Calculate the slope between two points using rise over run.

System of Equations Calculator

Solve a 2×2 system a1x + b1y = c1, a2x + b2y = c2.

Trigonometry Calculator

Evaluate sin, cos, tan, sec, csc, or cot of an angle in degrees or radians.

30-60-90 Triangle Calculator

Scale a 30-60-90 triangle from the short side: x, x√3, and 2x.

45-45-90 Triangle Calculator

From one leg, find the hypotenuse of a 45-45-90 triangle: leg × √2.

Absolute Value Calculator

Evaluate absolute values for a number or a simple linear expression at x.

Algebra Calculator

Evaluate a ± b × c with order of operations, or solve ax + b = c.

Angle Between Two Vectors Calculator

Find the angle between two 2D vectors using the dot product formula.

Angle of Elevation Calculator

Find the angle of elevation from opposite/adjacent or height and horizontal distance.

Arc Length Calculator

Compute circular arc length from radius and central angle, or from chord length.

Arccos Calculator

Compute arccos (acos) of a value and show degrees and radians.

Arcsin Calculator

Compute arcsin (asin) of a value and show the angle in degrees and radians.

Arctan Calculator

Compute arctan (atan) of a value and show degrees and radians.

Average Calculator

Find mean, median, mode, and range.

Average Percentage Calculator

Calculate the average (arithmetic mean) of a list of percentage values.

Binomial Theorem Calculator

Expand (a + b)^n with binomial coefficients from Pascal’s triangle.

Characteristic Polynomial Calculator

Find the characteristic polynomial of a 2×2 matrix.

Circumcenter Calculator

Find the circumcenter and circumradius of a triangle from three vertices.

Cofunction Calculator

Apply cofunction identities relating complementary angles for sin, cos, tan, and more.

Comparing Decimals Calculator

Compare two decimal numbers and see which is larger, smaller, or if they are equal.

Comparing Fractions Calculator

Compare two fractions and see which is greater, along with decimals and cross-products.

Completing the Square Calculator

Complete the square for ax² + bx + c and show vertex form.

Convolution Calculator

Compute the discrete convolution of two comma-separated sequences.

Cosecant Calculator

Calculate the cosecant of an angle: csc θ = 1 / sin θ.

Cosine Calculator

Calculate the cosine of an angle in degrees or radians.

Cotangent Calculator

Calculate the cotangent of an angle: cot θ = 1 / tan θ = cos θ / sin θ.

Coterminal Angle Calculator

Find positive and negative coterminal angles by adding or subtracting 360° or 2π.

Cross Multiplication Calculator

Solve proportions with cross multiplication: find x in a/b = c/x or a/b = x/d.

Decimal Calculator

Add, subtract, multiply, or divide two decimal numbers with clear results.

Decimal to Percent Calculator

Convert a decimal number into a percentage by multiplying by 100.

Degree and Leading Coefficient Calculator

Identify degree and leading coefficient from high-to-low coefficients.

Descartes Rule of Signs Calculator

Count possible positive and negative real roots via Descartes’ rule of signs.

Diamond Problem Solver

Find two numbers with a given sum and product.

Differential Equation Calculator

Solve separable exponential growth/decay dy/dx = ky with y(0) = y0.

Discriminant Calculator

Compute the discriminant and classify the nature of quadratic roots.

Distributive Property Calculator

Expand expressions using the distributive property a(b + c).

Double Angle Calculator

Evaluate double-angle identities for sine, cosine, and tangent of 2θ.

Equation of a Line Calculator

Find a line equation from two points or from a point and slope.

Equilateral Triangle Calculator

From one side length, compute area, height, and perimeter of an equilateral triangle.

Equivalent Expressions Calculator

Expand a(bx + c) and report the equivalent linear expression.

Equivalent Fractions Calculator

Generate an equivalent fraction by multiplying numerator and denominator by a scale factor.

Euler's Number Calculator

Approximate e and e^x using a Taylor series.

Even or Odd Function Calculator

Determine if a polynomial is even, odd, or neither from its coefficients.

Exponent Calculator

Calculate powers and exponents.

FOIL Calculator

Multiply two binomials using FOIL and show each product term.

Fraction Calculator

Add, subtract, multiply, and divide fractions.

Fraction Exponent Calculator

Raise a fraction (a/b) to an integer power n and simplify the result.

Fraction Simplifier Calculator

Simplify any fraction to lowest terms by dividing by the greatest common divisor.

Fraction to Decimal Calculator

Convert a fraction to its decimal equivalent with clear precision.

Fraction to Percent Calculator

Convert a fraction into a percentage and see the decimal along the way.

Fundamental Counting Principle Calculator

Multiply sequential choice counts using the fundamental counting principle.

Half Angle Calculator

Evaluate half-angle formulas for sine, cosine, and tangent of θ/2.

Hypotenuse Calculator

Calculate the hypotenuse of a right triangle from legs a and b.

Improper Fraction to Mixed Number Calculator

Convert an improper fraction into a mixed number and decimal.

Inequality Calculator

Solve linear inequalities and show the solution in interval form.

Interval Notation Calculator

Write inequality bounds in interval notation with open or closed endpoints.

Law of Cosines Calculator

Use the Law of Cosines for SSS (find an angle) or SAS (find the third side).

Law of Sines Calculator

Apply the Law of Sines for AAS/ASA (two angles + one side) or careful SSA ambiguous cases.

LCD Calculator

Find the least common denominator (LCM of denominators) for two fractions.

Linear Approximation Calculator

Approximate f near a with the tangent-line linearization for power, sin, cos, or exp.

Linear Interpolation Calculator

Estimate a value between two known data points with linear interpolation.

Mean Value Theorem Calculator

Find c guaranteed by the Mean Value Theorem on [a,b] for a quadratic.

Midpoint Calculator

Find the midpoint of a line segment between two points in the plane.

Midpoint Rule Calculator

Approximate an integral with the midpoint rule from equally spaced y-values.

Mixed Number Calculator

Convert a mixed number (whole + fraction) into an improper fraction and decimal.

Mixed Number to Improper Fraction Calculator

Convert a mixed number into a simplified improper fraction and decimal.

Modular Inverse Calculator

Find the modular multiplicative inverse of a modulo m.

Monomial Calculator

Multiply or divide monomials of the form coeff·x^n.

Multiplicative Inverse Calculator

Find the reciprocal (multiplicative inverse) of a fraction or decimal.

Multiplying Polynomials Calculator

Multiply two linear polynomials and collect like terms.

Orthocenter Calculator

Find the orthocenter of a triangle from three vertex coordinates in the plane.

Parallel and Perpendicular Lines Calculator

Find slopes and line equations that are parallel or perpendicular to a given line.

Partial Fraction Decomposition Calculator

Decompose a proper rational function with distinct linear factors.

Pascal's Triangle Calculator

Generate row n of Pascal’s triangle (binomial coefficients).

Percent Error Calculator

Calculate percent error between an approximate value and an exact value.

Percent to Decimal Calculator

Convert a percentage into its decimal form by dividing by 100.

Percent to Fraction Calculator

Convert a percentage into a simplified fraction and decimal.

Percentage Decrease Calculator

Find percent decrease from old to new, or decrease a value by a given percent.

Percentage Difference Calculator

Calculate the percentage difference between two numbers using their average.

Percentage Increase Calculator

Find percent increase from old to new, or increase a value by a given percent.

Point-Slope Form Calculator

Build the point-slope equation of a line from a point and slope.

Polynomial Long Division Calculator

Divide a quadratic cx² + dx + e by a linear ax + b.

Power of 10 Calculator

Express a number in scientific notation using powers of 10.

Power Reducing Formula Calculator

Evaluate power-reducing identities for sin²θ, cos²θ, and tan²θ at a given angle.

Product Sum Calculator

Find integer factor pairs of a product that add to a given sum.

Radical Equation Calculator

Solve radical equations of the form √(ax + b) = c and check extraneous roots.

Random Number Generator

Generate random numbers within a chosen range.

Ratio Calculator

Simplify and compare ratios.

Rational Expressions Calculator

Multiply or divide simple rational numbers a/b and c/d.

Rational Zeros Calculator

List possible rational zeros using the rational root theorem.

Rationalize the Denominator Calculator

Rationalize denominators of the form a/√b or a/(c + √d).

Reciprocal Calculator

Find the reciprocal 1/x of a nonzero number.

Reference Angle Calculator

Find the acute reference angle for any angle in degrees or radians.

SAS Triangle Calculator

Solve SAS: two sides and the included angle to find the third side and area.

Secant Calculator

Calculate the secant of an angle: sec θ = 1 / cos θ.

Similar Triangles Calculator

Find a missing corresponding side using a scale factor or a proportion of similar triangles.

Simplify Radicals Calculator

Simplify square roots by extracting perfect-square factors.

Slope Percentage Calculator

Convert rise over run into a percent slope (grade).

Slope-Intercept Form Calculator

Find y = mx + b from slope and a point or from slope and intercept.

SOHCAHTOA Calculator

Given any two of opposite, adjacent, and hypotenuse, find the rest plus acute angles.

Solve for X Calculator

Solve linear equations of the form ax + b = c.

Square Root Calculator

Calculate square roots and radicals.

Square Root Curve Calculator

Map x-values through y = a√(x − h) + k style square-root transforms.

Standard Form to Slope-Intercept Calculator

Convert a linear equation from standard form Ax + By = C into slope-intercept form.

Substitution Calculator

Substitute numeric values into the linear expression ax + by.

Synthetic Division Calculator

Divide a polynomial by (x − r) using synthetic division.

Tangent Calculator

Calculate the tangent of an angle in degrees or radians.

Tangent Line Calculator

Find the tangent line to y = ax² + bx + c at a chosen x-value.

Triangle Calculator

Solve a triangle in SSS, SAS, or ASA mode for sides, angles, and area using the Law of Cosines.

Unit Circle Calculator

Convert an angle on the unit circle into cos, sin, tan and (x, y) coordinates.

Variation Calculator

Solve direct (y = kx) or inverse (y = k/x) variation for k or y.

Vertex Form Calculator

Convert ax² + bx + c into vertex form and report the vertex.

X and Y Intercepts Calculator

Find x- and y-intercepts from Ax + By = C or y = mx + b.