Math Calculators

ArrayKit's math calculators cover everyday arithmetic, algebra, geometry and statistics — percentages, fractions, exponents, roots, quadratic equations, triangles, areas, volumes, standard deviation, probability and more. Each calculator runs entirely in your browser, so the numbers you enter are processed on your device and never uploaded. They show the result along with the steps or formula where it helps, so you can check your working. Whether you are doing homework, a quick conversion, a geometry problem or a statistics assignment, these tools give fast, accurate answers with no setup.

• Percentage Calculator — Solve percentage problems: X% of Y, X is what % of Y, and percent change.
• Fraction Calculator — Add, subtract, multiply and divide fractions and simplify the result.
• Percent Error Calculator — Calculate percent error between an experimental and true value.
• Exponent Calculator — Raise a base to any power, including negative and fractional exponents.
• Log Calculator — Compute logarithms in any base, plus natural log and log base 10.
• Root Calculator — Find square roots, cube roots and any nth root of a number.
• Quadratic Formula Calculator — Solve quadratic equations ax²+bx+c=0 with real or complex roots and steps.
• Ratio Calculator — Simplify ratios and solve proportions for a missing value.
• Rounding Calculator — Round numbers to decimals, significant figures or the nearest multiple.
• Scientific Notation Converter — Convert numbers to and from scientific, e-notation and engineering notation.
• LCM Calculator — Find the least common multiple of two or more integers with the steps.
• GCF Calculator — Find the greatest common factor of two or more integers with the steps.
• Factor Calculator — List all factors of a number and its prime factorization.
• Triangle Calculator — Solve a triangle from sides and angles, with area, perimeter and type.
• Right Triangle Calculator — Solve a right triangle from any two sides or a side and an angle.
• Pythagorean Theorem Calculator — Find a missing side of a right triangle with a²+b²=c².
• Area Calculator — Calculate the area of circles, rectangles, triangles, trapezoids and more.
• Volume Calculator — Calculate the volume of spheres, cylinders, cones, boxes and more.
• Surface Area Calculator — Calculate the surface area of spheres, cylinders, cones, boxes and more.
• Circle Calculator — Find a circle’s radius, diameter, circumference and area from any one value.
• Standard Deviation Calculator — Calculate population and sample standard deviation, variance and mean of a data set.
• Mean, Median, Mode, Range Calculator — Find the mean, median, mode and range of a list of numbers.
• Statistics Calculator — Compute full descriptive statistics for a data set — mean, SD, quartiles and more.
• Probability Calculator — Calculate probabilities of single and combined events, including conditional.
• Permutation and Combination Calculator — Calculate permutations (nPr) and combinations (nCr) for n and r.
• Z-score Calculator — Convert a value to a z-score and find the probability from the normal distribution.
• Confidence Interval Calculator — Compute a confidence interval for a mean from sample statistics.
• Sample Size Calculator — Find the survey sample size needed for a confidence level and margin of error.
• Slope Calculator — Find the slope, intercept, distance and equation of a line through two points.
• Distance Calculator — Calculate the distance between two points in 2D or 3D space.
• Number Sequence Calculator — Find terms and sums of arithmetic, geometric and Fibonacci sequences.
• Half-Life Calculator — Solve half-life, decay time, and remaining quantity of a decaying substance.
• Big Number Calculator — Do exact arithmetic on very large integers beyond normal precision.
• Binary Calculator — Add, subtract, multiply and divide binary numbers and convert to decimal/hex.
• Hex Calculator — Add, subtract, multiply and divide hexadecimal numbers and convert bases.
• Matrix Calculator — Add, multiply, transpose and find the determinant and inverse of matrices.
• Scientific Calculator — A full scientific calculator for trig, logs, powers, roots and constants.
• Random Number Generator — Generate random numbers in a range, with unique values, decimals and count.

Frequently asked questions

Do I need to install anything to use these math calculators?

No. Every math calculator on ArrayKit runs directly in your browser, so there is nothing to install and the numbers you enter are processed locally on your device.

Do these math calculators show the steps or just the answer?

Many of them show the formula and intermediate steps alongside the answer — for example the quadratic formula, fraction simplification and standard deviation calculators break down how the result is reached.

Do the math calculators send my numbers anywhere?

No. All of the math happens in your browser, so the values you type never leave your device or get uploaded to ArrayKit.

Which math calculators does ArrayKit offer?

The category includes arithmetic and algebra (percentage, fraction, exponent, log, quadratic), geometry (triangle, circle, area, volume, surface area) and statistics (mean, standard deviation, probability, z-score, confidence interval).