Basic Math Calculators

Calculate absolute value, cube root and factorial and other basic math calculations.

Popular:Absolute Value CalculatorCube Root CalculatorFactorial CalculatorGCF CalculatorLCM CalculatorModulo Calculator

All Basic Math Calculators

Absolute Value CalculatorCalculate the absolute value of a number — its distance from zero, always expressed as a non-negative value.Cube Root CalculatorCalculate the cube root of any number, positive or negative.Factorial CalculatorCalculate the factorial (n!) of a whole number — the product of all positive integers up to n.GCF CalculatorCalculate the greatest common factor (GCF), also known as the greatest common divisor (GCD), of two whole numbers.LCM CalculatorCalculate the least common multiple (LCM) of two whole numbers.Modulo CalculatorCalculate the modulo of two numbers (a mod b) — the result always takes the sign of the divisor, matching the convention used in mathematics and languages like Python.Nth Root CalculatorCalculate the nth root of any number, for any root degree you choose — a generalization of square root and cube root.Percent Error CalculatorCalculate the percent error between an experimental (measured) value and a theoretical (accepted) value — commonly used in science and lab work.Percentage CalculatorCalculate what a given percentage of a number is, along with the remaining amount — for example, "what is 20% of 250?"Percentage Change CalculatorCalculate the percentage change between an original value and a new value — works for both increases and decreases.Percentage Decrease CalculatorCalculate the percentage decrease from an original value to a lower new value.Percentage Difference CalculatorCalculate the symmetric percentage difference between two values, treating neither value as the "before" baseline.Percentage Increase CalculatorCalculate the percentage increase from an original value to a higher new value.Remainder CalculatorCalculate the remainder of two numbers (a divided by b) — the result always takes the sign of the dividend, matching the convention used by most calculators and programming languages like JavaScript and C.Rounding CalculatorRound a number to a fixed number of decimal places, or to the nearest multiple of any amount — to the nearest value, always up, or always down.Scientific Notation CalculatorConvert a number between standard decimal form and scientific notation (a × 10^b), in either direction.Square Root CalculatorCalculate the square root of any non-negative number.

Basic Math Guides

Mathematics2 min read

Big Number Results in Scientific Notation

A big-number arithmetic result can run to dozens of digits, and feeding that exact digit string straight into the scientific notation calculator turns it into a compact, readable mantissa and exponent.

Read guide
Mathematics2 min read

Converting Numbers to Scientific Notation: Worked Examples

Scientific notation rewrites any number as a mantissa between 1 and 10 multiplied by a power of ten, and the direction can be reversed to expand a compact scientific value back into a full decimal.

Read guide
Mathematics2 min read

How a Number Is Rounded: Decimal Places vs. Nearest Multiple

Rounding can mean two different things — trimming a number down to a fixed number of decimal places, or snapping it to the nearest multiple of some amount — and the direction (nearest, up, or down) changes the outcome of each.

Read guide
Mathematics2 min read

How a Percentage of a Number Is Calculated

Finding "X% of Y" is a single multiplication once the percentage is converted to a decimal fraction, but the result rarely lands on a clean, round figure — worked examples show why the leftover decimal places matter.

Read guide
Mathematics1 min read

How Exponents, Roots, and Logarithms Are Inverse Operations

Exponentiation, roots, and logarithms all describe the same relationship between three numbers — a base, an exponent, and a result — each one solving for whichever piece the other two leave unknown.

Read guide

Other Mathematics Subcategories

Arithmetic12 calculatorsExplore →Geometry8 calculatorsExplore →Number Systems7 calculatorsExplore →Trigonometry6 calculatorsExplore →