Math & Percentage Calculators
Percentage, fraction, exponent, root, average, ratio, HCF and LCM, prime factor and standard deviation calculators.
Percentage CalculatorFind X% of any number instantly, with the formula and a worked example.Percentage Change CalculatorEnter the old and new value to get the percentage increase or decrease.What Percent CalculatorFree calculator to find what percent one number is of another, for example what percent 30 is of 200.Discount CalculatorEnter the original price and discount percentage to see the sale price and how much you save, with optional extra discount.Average CalculatorEnter a list of numbers to get the mean, median, sum, count, smallest and largest value instantly.HCF and LCM CalculatorEnter two or more whole numbers to find their highest common factor (GCD) and least common multiple.Quadratic Equation SolverEnter a, b and c to find the roots, the discriminant and whether the roots are real or complex.Ratio CalculatorEnter two numbers to simplify the ratio to its lowest terms and see the decimal value and each part’s share.Standard Deviation CalculatorEnter a list of numbers to get the standard deviation, variance, mean, sum and count, for a sample or population.Percentage Error CalculatorCompare a measured value with the true value to get the percent error, absolute error and direction.Fraction CalculatorAdd, subtract, multiply or divide two fractions and get the simplified answer, mixed number and decimal.Exponent CalculatorRaise any base to any power, including negative and fractional exponents, with scientific notation for big results.Square Root CalculatorFind square, cube and nth roots, see if a number is a perfect square and get the simplified radical form.Speed, Distance & Time CalculatorEnter any two of speed, distance and time to find the third, with time shown in hours and minutes.Prime Factorization CalculatorBreak any whole number into prime factors, check if it is prime and list its divisors.Ohm's Law CalculatorEnter any two of voltage, current and resistance to find the third, plus the power in watts.Pythagorean Theorem CalculatorEnter two sides of a right triangle to find the third, plus area, perimeter and both acute angles.Circle Calculator (Area, Circumference)Enter the radius, diameter, circumference or area and get all the others instantly.Triangle Area Calculator (Heron’s Formula)Enter the three sides to get the area with Heron’s formula, plus perimeter, type of triangle and height.Permutation and Combination Calculator (nPr, nCr)Enter n and r to get nPr, nCr, n factorial and n to the power r, with exact values for large numbers.Scientific Notation CalculatorConvert any number to scientific, engineering and E notation, or standard form, with your chosen significant figures.Log Calculator (Logarithm)Find the logarithm of a number to any base, plus natural log (ln), log base 10 and log base 2.Slope CalculatorEnter two points to get the slope, line equation, angle, distance and midpoint between them.Volume Calculator (Cube, Cylinder, Cone, Sphere)Find the volume and surface area of a cube, box, cylinder, cone or sphere from its dimensions.Area Calculator (Rectangle, Triangle, Circle, Trapezoid)Find the area of a rectangle, triangle, parallelogram, trapezoid or circle from its dimensions, with the formula shown.Z-Score CalculatorEnter a value, the mean and the standard deviation to get the z-score and the share of a normal distribution below and above it.Proportion CalculatorEnter three values of a : b = c : d to find the fourth, using cross multiplication.Probability CalculatorFind the chance that both, either or neither of two independent events happen, and of at least one success in repeated tries.Decimal to Fraction CalculatorConvert a decimal such as 0.375 to a simplified fraction and a mixed number, with a choice of maximum denominator.Arithmetic and Geometric Sequence CalculatorFind the nth term and the sum of the first n terms of an arithmetic or geometric sequence.Percent Difference CalculatorCompare two values with the symmetric percent difference, and see the percentage change from the first to the second.System of Equations Calculator (2 Variables)Solve two linear equations with two unknowns, and see when there is no or infinite solution.Factorial CalculatorFind n factorial exactly for any whole number up to 1,000, with the digit count and trailing zeros.Rounding CalculatorRound a number to decimal places, significant figures or the nearest multiple, with half-up, banker’s, up and down results.