Math calculators
Percentage, fractions, roots, rounding, modulo, midpoint, statistics, and geometry in this tab. Not a CAS or graphing calculator.
70 tools
Subcategories
In this group
Start with the scientific calculator or percentage. Order of operations is PEMDAS. Rounding covers half up, half even, floor, ceil, and significant figures. Modulo compares Euclidean remainder with JavaScript a % n. The midpoint of a segment sits with distance and slope. Statistics and geometry have their own groups.
Fractions, GCD, LCM, primes, and the quadratic formula live in this group. Integer binary math is binary calculator. Base conversion without arithmetic is number base.
- Adding Machine Running total of a list: sum, count, and mean. Negatives allowed as subtractions.
- Binary Math Calculator Integer binary math and bitwise ops. Output in decimal, binary, hex, and octal. Stays in this tab.
- Combination Calculator C(n, k) = n! / (k! (n − k)!) for unordered selections.
- Decimal to Fraction Calculator Best-fit fraction for a decimal, searching denominators up to the cap you set.
- Distance Between Two Points Euclidean distance between two plane points.
- Equation of a Line Calculator Enter two distinct plane points. The page returns slope m, y-intercept b, slope-intercept form y = mx + b, and point-slope form through the first point. Vertical segments report x = constant instead.
- Euclidean Algorithm Calculator Compute gcd(a, b) by repeating a = bq + r until the remainder is 0. The page lists each division step so you can check homework against the classic Euclidean algorithm. Defaults are a = 1071 and b = 462.
- Exponent Calculator base^exponent with IEEE floating point. Rejects non-finite results.
- Factorial Calculator n! for an integer from 0 to 170. 0! is 1.
- Fibonacci Sequence Calculator Build the classic Fibonacci list starting at F0 = 0 and F1 = 1. Enter how many terms you want (up to 78 so every value stays a safe integer). The page lists the full sequence and highlights the last term.
- Fraction to Decimal Calculator Divide a fraction to a decimal and show the simplified form.
- Fraction Calculator Add, subtract, multiply, or divide two fractions. Result is simplified, mixed, and decimal.
- GCD Calculator Greatest common divisor of two or more integers, Euclidean algorithm.
- Increase or Decrease by Percent Increase or decrease a number by a percent. Returns the new amount and the difference.
- LCM Calculator Least common multiple of two or more integers. Rejects results beyond safe integers.
- Logarithm Calculator log_base(value), plus ln and log10 of the same value. Value must be positive.
- Long Division Calculator Integer division with quotient, remainder, and a reconstruction check. Truncates toward zero.
- Matrix Calculator Work with square 2x2 or 3x3 matrices only. Choose determinant, add, subtract, multiply, or inverse. Type each row as numbers separated by spaces, and separate rows with semicolons. This is numeric linear algebra for small matrices, not a computer algebra system (CAS).
- Midpoint Calculator The midpoint of a plane segment is the average of the endpoints. Type x1, y1, x2, and y2. Distance and slope of the same segment live on other math pages.
- Mixed Number Calculator Convert mixed numbers to improper fractions and back, then simplify.
- Modulo Calculator Type integers a and n. The page shows a Euclidean remainder (non-negative when n is positive), the JavaScript remainder a % n that follows the sign of a, and a floored remainder. n cannot be 0.
- Nth Root Calculator Principal real nth root. Even roots of negatives are rejected. n cannot be 0.
- Order of Operations Calculator Evaluate an arithmetic expression with ^ as power, * / before + −, and parentheses. Same parser as the scientific calculator.
- Percent Yield Calculator Compute percent yield from actual and theoretical yields. Both yields must use the same unit (grams or moles). Formula: % yield = (actual / theoretical) × 100.
- Percentage Change Calculator Percent change from an original value to a new value, plus the raw difference.
- What Is P Percent of X What is P percent of X. Same arithmetic as the percentage hub, locked to this job.
- Percentage to Fraction Convert a percent to a simplified fraction, mixed number, and decimal.
- Percentage Calculator Everyday percentage jobs: of, what percent, change, increase, and decrease. Figures stay on this device.
- Permutation Calculator P(n, k) = n! / (n − k)! for ordered selections. n at most 170 on this page.
- Price Elasticity Calculator Compute price elasticity of demand from two prices and two quantities. Choose midpoint (arc) elasticity or simple percent change from the initial values. Informational, not pricing advice.
- Prime Factorization Prime factorization of an integer from 2 to 1,000,000,000,000.
- Prime Checker Trial-division primality for integers up to 1,000,000,000,000 in absolute value.
- Proportion Calculator Solve a/b = c/d. Leave exactly one of a, b, c, d blank.
- Quadratic Formula Calculator Roots of ax² + bx + c = 0, including complex roots when the discriminant is negative.
- Ratio Calculator Simplify a:b and optionally solve a:b = c:x.
- Rounding Calculator Pick a rounding kind and a digit count. Half up, half down, and half even disagree on ties. Floor and ceil step toward -infinity or +infinity. Significant figures use the digits field as the significant count.
- Scientific Calculator Type an expression or use the keypad. Trigonometry uses the angle mode you pick. Nothing is uploaded.
- Slope Calculator Slope, y-intercept, line equation, and distance between two points. Vertical lines are flagged.
- Square Root Calculator Principal square root. Negatives are rejected as non-real on this page.
- Standard Form Calculator Convert any finite number into standard form a × 10^n, where the coefficient satisfies 1 ≤ |a| and |a| is less than 10 when the value is non-zero. Enter 12300 to see 1.23 × 10^4. Zero maps to 0 × 10^0.
- Vector Addition Calculator Add or subtract vectors a and b by matching components. Choose the operation, enter ax through bz, and read the result triple plus its Euclidean magnitude.
- Vector Magnitude Calculator Find the Euclidean length of a vector from components x, y, and optional z. Nonzero vectors also return the unit vector in the same direction.
- What Percent Is X of Y What percent is A of B. Whole cannot be 0.
- X and Y Intercepts Calculator Choose slope-intercept form or standard form. The page returns where the line meets the axes. Horizontal lines have no x-intercept. Vertical lines have no y-intercept.
- Bayes Theorem Calculator Update a prior with evidence. Enter P(A), P(B|A), and P(B) to get the posterior P(A|B) = P(B|A) P(A) / P(B).
- Binomial Probability Calculator Exact P(X = k), P(X ≤ k), and P(X ≥ k) for a binomial experiment with n trials, success probability p, and k successes. n is capped at 1000 on this page.
- Confidence Interval Calculator Build a normal (z) confidence interval for a mean from sample mean, SD, sample size, and a common confidence level. Educational large-n form, not a Student-t table product.
- Correlation Calculator Pearson product-moment r for paired numbers. Type one x y pair per line. r sits between -1 and 1. This is not Spearman rank or a p-value table.
- Average Calculator Arithmetic mean, sum, count, min, max, and range of a list you type.
- Median and Mode Median and mode of a numeric list. Ties for mode are listed together.
- Probability Calculator Combine two probabilities with and, or, not, or conditional rules. Toggle independence or type P(A and B) when events depend on each other.
- Sample Size Calculator Wald sample size for a proportion. n = z^2 p (1-p) / e^2. Optional finite N. Educational, not a survey product and not a power analysis for a mean.
- Standard Deviation Calculator Population and sample standard deviation and variance for a list you type.
- t-Score Calculator Compute the one-sample t statistic from a value x, hypothesized or sample mean, sample SD s, and sample size n. Educational arithmetic only; no critical-value table.
- Variance Calculator Population and sample variance, with matching standard deviations.
- Weighted Average Weighted average from value-weight pairs. Weights must sum to more than 0.
- Z-Score Calculator z = (x − mean) / SD. Standard deviation cannot be 0.
- Circle Calculator Radius, diameter, circumference, and area. Enter any one; the rest follow with π from this device.
- Circumference to Diameter Calculator Enter exactly one of circumference, diameter, or radius. The page fills the other two using Math.PI from this browser. Area is not on this spoke; use the circle calculator for area.
- Cone Calculator Right circular cone. Volume is one third π r squared h. Slant height is the hypotenuse of r and h. Lateral and total surface follow from that slant. Units are whatever you typed.
- Cylinder Calculator Right circular cylinder: volume, lateral area, and total surface area.
- Ellipse Calculator Enter semi-axes a and b. Area is exactly πab. Perimeter uses Ramanujan's closed-form approximation, not an elliptic-integral solver.
- Heron's Formula Calculator Find the area of any triangle when you know all three sides. Heron's formula uses the semi-perimeter s = (a + b + c) / 2, then area = sqrt(s(s - a)(s - b)(s - c)). Defaults show the classic 3-4-5 right triangle.
- Parallelogram Area Calculator Compute parallelogram area from base and perpendicular height. Enter the adjacent side when you also want perimeter. Area uses A = base × height, not the slanted side alone.
- Regular Polygon Area Calculator Compute area, perimeter, circumradius, and apothem for a regular polygon. Enter integer side count n and equal side length s. Irregular polygons are out of scope.
- Pythagorean Theorem Calculator Solve a² + b² = c². Enter exactly two of a, b, and c.
- Rectangle Calculator Rectangle area, perimeter, and diagonal. A square is the case length = width.
- Sphere Calculator Sphere volume and surface area from radius.
- Trapezoid Area Calculator Enter the two parallel bases and the perpendicular height. Area uses ((a + b) / 2) × h. Add both non-parallel legs when you also want perimeter.
- Triangle Calculator SSS triangle: Heron area, perimeter, all three angles, side class, and acute/right/obtuse.