Math
Percentages, fractions, ratios, statistics, rounding, grades and the score you need on a final, and other math helpers.
38 tools
- Number Scales ConverterConvert between counting words — dozens, grosses, thousands, lakhs, crores, millions and billions.
- Percentage CalculatorAnswer everyday percentage questions — X% of Y, X as a percent of Y, and percent increase or decrease.
- Fraction CalculatorAdd, subtract, multiply and divide fractions and mixed numbers, with an exact simplified answer.
- Standard Deviation CalculatorCalculate the standard deviation and variance of a data set, as a sample or a whole population.
- Scientific Notation ConverterWrite a number in scientific, E and engineering notation, or turn scientific notation back into a plain number.
- Rounding CalculatorRound a number to any number of decimal places (or tens, hundreds) using the rounding rule you need.
- Significant Figures CalculatorCount the significant figures in a number and round it to a chosen number of significant figures.
- Random Number GeneratorGenerate random whole or decimal numbers in a range, with or without repeats.
- Pythagorean Theorem CalculatorFind the missing side of a right triangle from the other two, plus its area, perimeter and angles.
- Exponent CalculatorRaise a number to any power — whole, negative or fractional — with exact results for whole-number powers.
- Square Root & Nth Root CalculatorFind the square root, cube root or any nth root of a number, with the simplified radical form.
- Logarithm CalculatorFind the logarithm of a number in any base, plus the natural log, log base 10 and log base 2.
- Prime Number & Prime Factorization CalculatorCheck whether a number is prime and break it into its prime factors — exact for very large numbers.
- GCF CalculatorFind the greatest common factor (GCF, also called GCD or HCF) of two or more whole numbers.
- LCM CalculatorFind the least common multiple (LCM) of two or more whole numbers — exact, however large.
- Modulo CalculatorFind a mod n — the remainder after division — with both the math (always positive) and programming conventions.
- Quadratic Equation SolverSolve ax² + bx + c = 0 for real or complex roots, with the discriminant and vertex.
- Completing the Square CalculatorRewrite ax² + bx + c in vertex form a(x − h)² + k by completing the square.
- Fraction, Decimal & Percent ConverterConvert between fractions, decimals and percents — type any one, get all three, including repeating decimals.
- Ratio to Fraction CalculatorTurn a ratio like 3 : 5 into fractions of the whole, percentages and the simplified ratio.
- Percent Error CalculatorFind the percent error between a measured (experimental) value and the true (accepted) value.
- Percent Tolerance CalculatorFind the allowed range for a nominal value with a ± percent tolerance, and check whether a measurement passes.
- Long Division CalculatorDivide whole numbers to get the quotient and remainder, with every long-division step shown.
- Factorial CalculatorCalculate n! exactly for whole numbers up to 5,000, with its digit count and scientific notation.
- Arithmetic Sequence CalculatorFind the nth term and the sum of the first n terms of an arithmetic sequence, and list its terms.
- Geometric Sequence CalculatorFind the nth term, the sum of n terms and the infinite sum of a geometric sequence.
- Exponential Growth & Decay CalculatorProject a quantity that grows or shrinks by a fixed percent per period, with its doubling time or half-life.
- Summation (Sigma) CalculatorAdd up an expression for i from a start value to an end value — sigma notation, evaluated.
- Numbers to Words ConverterSpell out any number in English words, or write a dollar amount the way it goes on a check.
- Final Exam Grade CalculatorFind the score you need on the final exam to finish the course with the grade you want.