Percentage Calculator
Work out any percentage, change or markup.
Math & Numbers
Calculators for arithmetic, algebra, geometry & stats.
Fraction Simplifier
Reduce a fraction and convert it to decimal or mixed form.
GCD & LCM Calculator
Find the greatest common divisor and least common multiple.
Prime Number Checker
Test for primes, find the next prime, or list them.
Factorial Calculator
Compute n!, permutations and combinations exactly.
Standard Deviation Calculator
Get mean, median, variance and standard deviation.
Area Calculator
Area and perimeter for six common shapes.
Average Calculator
Mean, median, mode and range in one click.
Circle Calculator
Find radius, diameter, circumference and area.
Decimal to Fraction
Turn any decimal into an exact, reduced fraction.
Distance Between Points
Find the distance between two 2D points instantly.
Exponent Calculator
Raise any number to any power, instantly.
Fraction Calculator
Add, subtract, multiply and divide fractions.
Fraction to Decimal
Turn any fraction into its exact decimal.
Linear Equation Solver
Solve a·x + b = c·x + d for x instantly.
Logarithm Calculator
Compute logs in any base instantly.
Mean Calculator
Arithmetic, geometric and harmonic means.
Median and Mode Calculator
Find the median and mode of any number set.
Midpoint Calculator
Find the midpoint and distance between two points.
Modulo Calculator
Find the remainder and true modulo of any division.
Number Sequence Generator
Generate arithmetic, geometric and Fibonacci sequences.
Percentage Change Calculator
Find the percent increase or decrease.
Permutations and Combinations
Count nPr, nCr and their repetition variants.
Prime Factorization
Break any whole number into its prime factors.
Proportion Solver
Solve a : b = c : d for the missing term.
Pythagorean Theorem Calculator
Solve right triangles with a² + b² = c².
Quadratic Equation Solver
Solve ax² + bx + c = 0 with real or complex roots.
Ratio Calculator
Simplify ratios and solve proportions instantly.
Root Calculator
Find the square, cube or any nth root of a number.
Rounding Calculator
Round numbers your way, to any precision.
Scientific Notation Converter
Convert numbers to scientific, E and decimal form.
Slope Calculator
Find the slope between two points instantly.
Triangle Solver
Solve any triangle from sides and angles.
Volume Calculator
Find the volume of cubes, boxes, spheres and more.
About Math & Numbers
Calculators for the maths that comes up in real life and study: percentages and percentage change, fractions, GCD and LCM, prime checking, factorials, standard deviation, random numbers and more. Each calculator shows the formula it used and the intermediate steps where that helps you learn or double-check — not just a bare answer. They run instantly in your browser with no uploads and no ads between you and the result, and they work offline once loaded. Useful for homework checking, quick engineering sanity checks and settling dinner-table arguments.