Math & Education

Percentage Calculator

Percent of a number, percent one number is of another, and percent change.

Fraction Calculator

Add, subtract, multiply, or divide fractions — auto-simplified.

Average Calculator

Mean, median, mode, standard deviation, sum and count from any list.

GPA Calculator

Weighted GPA on the 4.0 scale from your grades and credit hours.

Final Grade Calculator

"What do I need on the final?" — answered in one calculation.

Quadratic Formula Calculator

Roots of ax² + bx + c = 0 — real or complex — with the discriminant.

LCM & GCF Calculator

Least common multiple and greatest common factor of any numbers.

Square Root Calculator

The square root of any number — including negative inputs.

Standard Deviation Calculator

Sample and population standard deviation, variance, and mean.

Ratio Calculator

Simplify ratios and solve for a missing term.

Slope Calculator

Slope, y-intercept, and the line equation from two points.

Combination & Permutation Calculator

Compute nCr and nPr for counting problems.

Significant Figures Calculator

Round numbers to a chosen number of significant figures.

Probability Calculator

Probability as a decimal, percentage, and odds.

Exponent Calculator

Raise any base to any power, including negative and fractional exponents.

Logarithm Calculator

Logarithm of a number in any base, plus ln and log base 10.

Rounding Calculator

Round any number to a chosen number of decimal places.

Scientific Notation Converter

Convert numbers to scientific notation, E notation, and back.

Percentage Change Calculator

Percentage increase or decrease between two values.

Mean, Median, Mode Calculator

All three averages plus range from a list of numbers.

Prime Factorization Calculator

Break any integer into its prime factors.

Pythagorean Theorem Calculator

Solve for any side of a right triangle.

Triangle Area Calculator

Area from base and height, or from three sides (Heron's).

Scientific Calculator

Full scientific calculator with trig, log, memory, and keyboard support.

Triangle Area Calculator

Area of a triangle from base and height, or three sides (Heron's formula).

Circle Area Calculator

Area and circumference of a circle from radius or diameter.

Scientific Notation Calculator

Convert numbers to and from scientific notation.

Logarithm Calculator

Calculate logarithms with any base (common, natural, or custom).

Permutation & Combination Calculator

Calculate nPr and nCr for any n and r.

Rectangle Area Calculator

Area and perimeter of a rectangle from length and width.

Pythagorean Theorem Calculator

Find the missing side of a right triangle (a² + b² = c²).