Math & Science Calculators
Percentages, statistics, geometry, and more ยท 35 calculators
Percentages & Money4
Percentage Calculator
Calculate percentages, percent change, percent of a number, and more. Solves all common percentage problems instantly.
Percent Change Calculator
Calculate the percentage increase or decrease between two numbers. See the change as a percent and as an absolute difference, with the formula shown.
Markup & Margin Calculator
Calculate selling price, profit, markup, and margin from cost. Enter a markup percent, a margin percent, or a sale price to solve for the rest.
Ratio Calculator
Simplify a ratio A:B to lowest terms, or solve a proportion A:B = C:x to find the missing value. Also converts the ratio to a decimal and a percentage.
Arithmetic & Number Theory7
Fraction Calculator
Add, subtract, multiply, and divide two fractions. Get the answer fully simplified, as a mixed number, and as a decimal โ with the steps shown.
Fraction to Decimal Calculator
Convert a fraction to a decimal and a decimal back to a fraction. Detects repeating decimals and turns them into an exact fraction, fully simplified.
LCM & GCD Calculator
Find the least common multiple (LCM) and greatest common divisor (GCD) of two or more numbers, using the prime-factor and Euclidean methods.
Prime Factorization Calculator
Break any whole number into its prime factors and see the factorization in exponent form. Also checks whether a number is prime and lists all its divisors.
Exponent Calculator
Raise any base to any power, including negative and fractional exponents. Get the result plus the expanded form, and see what fractional powers mean as roots.
Logarithm Calculator
Calculate the logarithm of a number in any base, plus the natural log (ln) and common log (logโโ). Uses the change-of-base formula and shows the steps.
Square Root Calculator
Find the square root of any number, simplify a radical to aโb form, and calculate cube roots and nth roots. Shows exact simplified surds where possible.
Statistics13
Mean, Median, Mode & Range Calculator
Paste a list of numbers to find the mean, median, mode, range, sum, and count instantly. Handles any separator โ commas, spaces, or new lines.
Average Calculator
Find the average (mean) of a list of numbers, or compute a weighted average from values and weights. Shows the sum, count, and the result instantly.
Standard Deviation Calculator
Calculate the standard deviation and variance of a data set, for both a population and a sample. Also shows the mean, sum, and count of your numbers.
P-Value Calculator
Find the p-value from a z-score or t-statistic for a one- or two-tailed test. Uses an accurate normal CDF and Student-t distribution, with significance at ฮฑ = 0.05.
Confidence Interval Calculator
Calculate a confidence interval for a mean (z when ฯ is known, t when it isn't) or for a proportion. Shows the margin of error and the lower and upper bounds.
Z-Score Calculator
Calculate the z-score of a value given the mean and standard deviation, and find the percentile and tail probabilities from the standard normal distribution.
Normal Distribution Calculator
Find normal distribution probabilities โ P(X < x), P(X > x), or the probability between two values โ for any mean and standard deviation, using the normal CDF.
Sample Size Calculator
Find the survey sample size you need for a target confidence level and margin of error, with an optional finite-population correction. Uses n = zยฒp(1โp)/Eยฒ.
Margin of Error Calculator
Calculate the margin of error for a proportion or a mean at any confidence level. See the confidence interval bounds and the critical value used.
Probability Calculator
Calculate single- and multiple-event probabilities โ A and B, A or B, the complement, and draws with or without replacement โ from the chances of each event.
Permutation & Combination Calculator
Calculate permutations (nPr) and combinations (nCr) for choosing r items from n. Shows the factorial formulas and handles large values without overflow.
Percentile Calculator
Find a percentile or a percentile rank from a list of data, or compute a percentile from a mean and standard deviation using the normal distribution.
Correlation Coefficient Calculator
Calculate the Pearson correlation coefficient (r) between two paired lists of numbers, with the coefficient of determination (rยฒ) and a strength interpretation.
Algebra3
Scientific Calculator
A full scientific calculator with trig, log, ln, exponents, square root, ฯ, e, and factorial. Respects order of operations (PEMDAS) on any expression.
Quadratic Formula Calculator
Solve any quadratic equation axยฒ + bx + c = 0 using the quadratic formula. Finds real or complex roots, the discriminant, and the vertex of the parabola.
Slope Calculator
Find the slope of a line from two points, plus the y-intercept, the equation y = mx + b, the angle, and the distance between the points.
Geometry3
Area Calculator
Calculate the area of a rectangle, triangle, circle, trapezoid, or parallelogram. Pick a shape, enter the dimensions, and see the area and the formula.
Volume Calculator
Calculate the volume of a box, sphere, cylinder, or cone. Choose a shape, enter the dimensions, and get the volume with the formula used.
Circle Calculator
Enter any one of radius, diameter, circumference, or area, and instantly get the other three. Solves a complete circle from a single value.
Notation & Rounding3
Significant Figures Calculator
Count the significant figures in any number and round it to a chosen number of sig figs. Shows the result in standard and scientific notation, with the rules explained.
Scientific Notation Calculator
Convert a number to and from scientific notation and standard form, and see it in E-notation and engineering notation. Handles very large and very small numbers.
Rounding Calculator
Round a number to the nearest 10, 100, 1000, or to a set number of decimal places. Choose round-half-up or round-half-to-even (banker's rounding).
Numbers & Motion2
Random Number Generator
Generate one or more random numbers in any range. Choose integers or decimals and whether numbers can repeat โ for draws, picks, and games.
Speed, Distance & Time Calculator
Solve for speed, distance, or time when you know the other two. Choose your units โ miles or kilometers, hours or minutes โ for travel and pace math.