math Calculators

Quadratic Formula Calculator

Instantly solve any quadratic equation of the form ax² + bx + c = 0. Enter your three coefficients and get real solutions — perfect for algebra homework, engineering problems, or exam prep.

Find what a given percentage of a number is — for example, 18% of a $42 restaurant bill, or 7.5% sales tax on a $129 purchase. This calculator handles the most common percentage question that comes up in everyday math: "what is P% of N?" Enter the percentage and the base number, and you get the exact partial amount. It is the building block behind tip calculators, discount calculators, tax calculators, and most quick financial estimates you do on the fly.

Circle Area Calculator

Calculate the exact area enclosed by a circle from its radius in any unit. Useful for geometry homework, landscaping projects, cutting circular material, or engineering design.

Compound Interest Calculator

See how an investment or loan grows when interest is compounded annually. Enter your principal, interest rate, and time horizon to find the future value of your money.

Pythagorean Theorem Calculator

Find the hypotenuse of any right triangle by entering the two shorter sides. Ideal for construction, navigation, screen size comparisons, and geometry problems.

Factorial Calculator

Instantly compute the factorial of any non-negative integer. Use it for combinatorics, permutations, probability problems, and algebra involving n!

Slope Calculator

Find the slope of a line passing through any two coordinate points. Useful for geometry homework, graphing linear equations, and analyzing rates of change.

Greatest Common Factor Calculator

Find the greatest common factor of two integers in seconds. Use it to simplify fractions, factor expressions, or solve number-theory problems.

Distance Formula Calculator

Calculate the straight-line distance between two points on a coordinate plane. Ideal for geometry problems, map calculations, and verifying vector lengths.

Logarithm Calculator

Compute the logarithm of any positive number in any base instantly. Use it for solving exponential equations, working with decibels, pH, or Richter scale values.

Percentage Change Calculator

Instantly find how much a value has grown or shrunk between two points. Use it to track price shifts, population changes, or any before-and-after comparison.

Percentage Increase Calculator

Calculate the final value after applying a percentage increase to any starting number. Ideal for computing raises, markups, tax-inclusive prices, or growth projections.

Percentage Decrease Calculator

Find the resulting value after reducing a number by a set percentage. Use it for discounts, depreciation, budget cuts, or any scenario involving a proportional reduction.

Percent Error Calculator

Measure how far an estimated or measured value deviates from the true value as a percentage. Scientists, students, and engineers use it to assess the accuracy of experimental results.

Percentage Difference Calculator

Compare two values symmetrically by expressing their difference as a percentage of their average. Use it when neither value is a reference baseline — such as comparing two survey results or measurements.

Fraction to Percent Calculator

Convert any fraction to a percentage by dividing the numerator by the denominator and multiplying by 100. Useful for grades, ratios, and probability.

Square Root Calculator

Find the square root of any non-negative number instantly. Use it in geometry, physics, and algebra when solving for side lengths or standard deviations.

Cube Root Calculator

Calculate the cube root of any number, including negative values. Useful for finding the side length of a cube from its volume or solving cubic equations.

Exponent Calculator

Raise any base to any power — including negative, fractional, and decimal exponents. Ideal for compound interest, scientific calculations, and algebra.

Scientific Notation Converter

Convert numbers between standard decimal form and scientific notation instantly. Essential for handling very large or very small values in science and engineering.

Fraction Simplifier

Reduce any fraction to its lowest terms instantly by finding the greatest common divisor. Use it when adding fractions, checking equivalence, or simplifying homework answers.

Decimal to Fraction Converter

Convert any terminating decimal into an equivalent fraction in its simplest form. Ideal for students, cooks, and engineers who need exact fractional representations.

Least Common Multiple Calculator

Find the Least Common Multiple (LCM) of two integers — the smallest number both divide into evenly. Essential for adding fractions or scheduling repeating events.

Prime Factorization Calculator

Decompose any positive integer into its unique set of prime number factors. Use it for simplifying fractions, finding GCDs, or exploring number theory.

Prime Number Checker

Instantly determine whether any positive integer is prime or composite. Useful for number theory homework, cryptography study, and mathematical curiosity.

Linear Equation Solver

Solve any single-variable linear equation of the form ax + b = c instantly. Enter your three known values and get the exact solution for x — useful for algebra homework, engineering, or quick mental-math checks.

Ratio Calculator

Simplify any two-number ratio to its lowest terms and explore equivalent ratios in seconds. Ideal for cooking, map scaling, financial analysis, and mixing solutions where proportional relationships matter.

Proportion Calculator

Find the missing fourth value d in any proportion a/b = c/d when three values are known. Perfect for scaling recipes, converting units, solving map distances, and cross-multiplication problems.

Midpoint Calculator

Find the exact midpoint coordinates between any two points on a 2D coordinate plane. Used in geometry, graphic design, GPS path planning, and any task requiring the centre point of a line segment.

Permutation Calculator

Calculate the number of distinct ordered arrangements of r items chosen from a set of n items. Essential for counting passwords, race rankings, scheduling sequences, and any problem where order matters.

Combination Calculator

Find how many unique groups you can form when selecting r items from a set of n, where order doesn't matter. Perfect for lottery odds, team selection, and probability problems.

Basic Probability Calculator

Instantly calculate the probability of an event by entering the number of favorable and total outcomes. Useful for dice, cards, lotteries, and any scenario with countable outcomes.

Rounding Calculator

Round any number to a chosen number of decimal places in seconds. Ideal for homework, financial figures, measurements, and any situation requiring controlled precision.

Absolute Value Calculator

Find the absolute value of any positive or negative number instantly. Used in math, physics, and programming wherever only the magnitude of a value matters, not its sign.

Average Calculator

Calculate the arithmetic mean (commonly just called "the average") of up to five numbers — the simplest and most widely used measure of central tendency. Enter two to five values and the calculator returns their sum divided by the count of numbers entered. Missing or blank fields are excluded, so you can average just two or three values without having to fill all five. Useful for quickly averaging test scores, monthly expenses, sensor readings, or any small set of numbers where you want a single summary value that represents the group.

Modulo Calculator

Quickly find the remainder when one integer is divided by another. Essential for programming, cryptography, and checking divisibility in everyday math problems.

Tip Calculator

Calculate the tip amount and the total per person for any restaurant bill, with an optional split between multiple people. Use it for fast tip math in the US or any country with a tipping culture, especially when splitting the check with friends.