Math Calculators

Percentages, percent change, standard deviation, GCF and LCM, and the quadratic formula.

• Percentage CalculatorThree common percentage problems in one place.
• Percent Change CalculatorEnter a starting value and an ending value to see the percent increase or decrease and the absolute difference.
• Percent of a Number CalculatorEnter a percentage and a number to find the amount, plus the totals when you add or subtract that percentage.
• Standard Deviation CalculatorPaste or type a list of numbers and choose whether it is a whole population or a sample.
• GCF and LCM CalculatorEnter two or three positive whole numbers to find their greatest common factor and least common multiple.
• Quadratic Formula CalculatorEnter the coefficients a, b and c of a quadratic equation to get its roots, the discriminant and the vertex of the parabola.
• Fraction CalculatorEnter two fractions and choose an operation.
• Prime Factorization CalculatorEnter a whole number from 2 up to 1,000,000,000,000.
• Factorial CalculatorEnter a whole number from 0 to 170.
• Exponent CalculatorEnter a base and an exponent.
• Square Root CalculatorEnter a number and the root you want.
• Percent Error CalculatorChoose percent error to compare a measured value with a true value, or percent difference to compare two values neither of which is the reference.
• Ratio CalculatorA ratio problem such as 2 : 3 = 4 : x has three known numbers and one unknown.
• Roman Numeral ConverterChoose which way you want to convert, then enter a number or a Roman numeral.
• Pythagorean Theorem CalculatorEnter any two sides of a right triangle and leave the third empty.
• Triangle CalculatorEnter the lengths of the three sides.
• Area CalculatorChoose a shape, pick your unit and enter the measurements.
• Circle CalculatorPick the measurement you know, enter it, and the calculator works out the other three.
• Volume CalculatorChoose a shape, pick your unit and enter the measurements.
• Slope, Distance and Midpoint CalculatorEnter the coordinates of two points.
• Logarithm CalculatorEnter a number and a base.
• Number Sequence CalculatorChoose the kind of sequence, enter the first term and the step, and say how many terms you want.
• Factor CalculatorEnter a whole number.
• Rounding CalculatorEnter a number, choose how many places or significant figures and a method.
• Scientific Notation CalculatorType a number as a plain decimal, in E notation such as 6.022e23, or as 6.022 × 10^23.
• Long Division CalculatorEnter a dividend and a divisor.
• Basic CalculatorType a calculation such as (12.5 + 7.5) × 3 − 18 ÷ 4.
• Random Number GeneratorSet the smallest and largest number and how many you want.
• Half-Life CalculatorChoose what you want to find and enter the other three values.
• Matrix CalculatorType one or two matrices, with the rows separated by semicolons, and choose an operation.
• Big Number CalculatorEnter two whole numbers of any size and choose an operation.
• P-Value CalculatorChoose the distribution, enter the test statistic and the degrees of freedom, and pick the tail.
• Density CalculatorChoose what you want to find and enter the other two values with their units.
• Molarity CalculatorChoose what to find.
• Molecular Weight CalculatorType a chemical formula.