Calculate area and perimeter for seven shapes: circle, rectangle, square, triangle, trapezoid, parallelogram, and hexagon. Includes interactive diagrams.
Find mean, median, min, max, and sum from any data set. Smart parser strips dollar signs, commas, and percent signs so you can paste directly from spreadsheets.
A full-featured basic calculator with number pad, history tape, and order-of-operations support. Perfect for quick calculations with a running log.
Perform exact arbitrary-precision integer arithmetic with BigInt. Add, subtract, multiply, divide, and exponentiate numbers with hundreds of digits.
Convert between Decimal, Binary, Hex, and Octal with positional value breakdown. Perform arithmetic and bitwise operations (AND, OR, XOR, NOT, shifts).
Find radius, diameter, circumference, and area from any single known circle measurement. Shows reverse engineering steps for all four circle properties.
Find all common factors shared by two numbers. Lists every divisor that divides both numbers evenly, with the Greatest Common Factor (GCF) highlighted.
Calculate confidence intervals for a population mean. Breaks out the Margin of Error (MOE), critical Z-value, and standard error.
Convert between hundreds of units across 8 categories including weight, length, temperature, volume, area, speed, and currency.
Add or subtract years, months, weeks, and days from any date. Includes a business-days-only mode that skips weekends, leap year handling, and month-end.
Calculate the Euclidean distance between two points in 1D, 2D, or 3D space. Shows the distance formula, step-by-step calculation, midpoint, and slope.
Raise any base to any power including negative, fractional, and decimal exponents. Shows expanded form, scientific notation, power-rule breakdown, and.
Find all factors of any positive integer with a complete factor pairs table, total factor count, sum of factors, and primality test.
Add, subtract, multiply, and divide fractions with step-by-step solutions. Shows LCM for common denominators and simplifies using GCD.
Convert fractions to decimals, decimals to fractions, and mixed numbers to decimals. Automatically simplifies fractions using GCD.
Find the Greatest Common Factor (also called GCD or HCF) of two numbers using both the Euclidean algorithm with step-by-step division and prime.
Calculate Nominal and Real GDP using the expenditure approach: GDP = C + I + G + (X − M). Free online calculator with formula guide and step-by-step results.
Compute weighted and unweighted GPA from course grades and credits. Target GPA mode shows the exact grades needed in remaining courses to reach your goal.
Determine what score you need on your final exam to achieve your target overall grade. Supports any current grade, desired grade, and exam weight combination.
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Half-Life Calculator — Exponential Calculate radioactive decay, carbon dating, and drug elimination using the exponential decay formula. Free, instant, and accurate.
Predict a child's adult height using the Mid-Parental Height (Tanner) method with gender-specific adjustments. Includes expected range (±2 in), worked examples for pediatricians and parents, and guidance on when height predictions warrant medical follow-up.
Find the Least Common Multiple of two or more numbers using both the efficient GCD-based formula and the prime factorization method side by side.
Calculate logarithms in any custom base with the change of base formula explained step-by-step. Free, instant, and accurate.
Perform long division with the traditional tableau format. Shows each step — divide, multiply, subtract, bring down — just like the classroom method.
Calculate percentages in five different ways: what is X% of Y, X is what percent of Y, percent change, add or subtract a percentage.
Calculate the determinant and inverse of square matrices from 2×2 to 5×5. Shows step-by-step calculation with LaTeX-style formatting for college assignments.
Calculate the mean, median, mode, sum, and range from any data set with step-by-step median breakdown for even-numbered datasets.
Identify arithmetic, geometric, and Fibonacci sequences. Find common difference, common ratio, nth-term formula, and compute next terms.
Calculate any nth root — square roots, cube roots, and beyond. Shows both radical form and fractional exponent equivalent with step-by-step verification.
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P-value Calculator — Statistical Si Compute p-values from Z-scores or T-scores for one-tailed and two-tailed hypothesis tests. Free online calculator with formula guide and step-by-step results.
Calculate percent error, absolute error, signed error, accuracy, and relative error between accepted and experimental values.
Calculate permutations (nPr) and combinations (nCr) with step-by-step factorial breakdown. Toggle between order matters vs.
Break any integer into its unique prime factors with an interactive factor tree. Detects perfect squares, cubes, and handles numbers up to one million.
Compute joint (A∩B), union (A∪B), conditional P(A|B), and complement probabilities for independent or mutually exclusive events with Venn diagram.
Solve right triangles using the Pythagorean theorem and SOH CAH TOA trigonometry. Find sides, angles, area, and perimeter with a dynamic SVG triangle and.
Solve any quadratic ax²+bx+c=0 with the quadratic formula. Get real or complex roots, discriminant, vertex, axis of symmetry, factored form, and Vieta.
Generate cryptographically secure random numbers using Web Crypto API. Customizable range, count, decimal precision, unique values, and batch statistics.
Simplify ratios, find missing values in proportions, and scale dimensions. Includes common aspect ratio presets (16:9, 4:3, 1:1, 21:9) for digital.
Round numbers to the nearest million, thousand, hundred, ten, unit, tenth, hundredth, thousandth, or ten-thousandth. Free, instant, and accurate.
Determine the ideal sample size for surveys and research studies. Adjust for population size, confidence level, and margin of error.
Full-featured online scientific calculator with trigonometric functions, logarithms, memory operations, and calculation history.
Convert between decimal and scientific notation. Learn how the decimal point jumps left or right with an interactive movement visualization.
Calculate slope between two points with all three equation forms, distance, midpoint, and angle. Includes simplified fraction and interactive coordinate graph.
Compute standard deviation, variance, mean, median, range, and coefficient of variation from any dataset. Free online calculator with step-by-step results.
Comprehensive descriptive statistics calculator with a dynamic box-and-whisker plot. Computes the five-number summary, quartiles, IQR, standard deviation.
Calculate time differences between start and end times with automatic overnight detection, break deductions, and optional gross pay computation.
Track weekly work hours with day-by-day entries. Calculates regular and overtime hours, handles 12hr/24hr time formats, overnight shifts, and optional pay.
Convert time between 24 time zones worldwide with business hours overlay. Green-yellow-gray color-coded grid shows the best meeting times across multiple.
Solve any triangle using SSS, SAS, or ASA input modes. Computes all sides, angles, area, and perimeter with dynamic SVG visualization.
Calculate volume and surface area of spheres, cubes, rectangular prisms, cylinders, cones, and pyramids. Free, instant, and accurate.
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Z-Score Calculator — Free Online Ca Calculate the Z-score from a raw score, population mean, and standard deviation. Visualizes the result on a standard normal distribution curve with shaded.
Convert numbers to Roman numerals and back, including date conversion. Features subtractive notation breakdown and tattoo verification.
Calculate density, mass, or volume using ρ = m/V with the formula triangle mnemonic. Includes unit conversion between g/cm³, kg/m³, and lbs/ft³ with.
Calculate mass, density, or volume using m = ρ × V. Shows planetary weight comparison on Earth, Moon, Mars, and Jupiter with unit conversions.
Calculate weight, mass, or gravitational acceleration using the W = mg formula. Compare weight across Earth, Moon, Mars, Jupiter, and the Sun.
Calculate speed, distance, or time using S = D/T. Converts between mph, km/h, m/s, and knots with simultaneous display. Free, instant, and accurate.
Calculate molarity, mass, or volume of chemical solutions. Auto-detects compounds and shows step-by-step derivation of moles and concentration.
Calculate molecular weight from any chemical formula with element breakdown and mass percentage composition. Supports hydrates and parentheses.
Calculate the exact duration between two dates and times down to the second. Supports business days mode and multiple output formats for project.
Count the exact number of days between two dates with precision down to the day. Includes business days exclusion, end-date inclusion toggle, and.
Find the day of the week for any date using Zeller's congruence. Features a perpetual calendar algorithm explanation and historical context.
Roll virtual dice with crypto-grade randomness. Supports D4, D6, D8, D10, D12, and D20 with modifiers. Free, instant, and accurate.
Calculate pH from hydrogen ion concentration, convert between pH and pOH, and classify solutions as acidic, basic, or neutral.
Calculate the Pearson correlation coefficient between two variables. Shows r, r², strength, and direction with step-by-step work.
Compute key descriptive statistics for any dataset: mean, median, mode, range, variance, standard deviation, quartiles, and IQR.
Solve linear (ax + b = 0) and quadratic (ax² + bx + c = 0) equations instantly. Shows discriminant, roots, and step-by-step solutions.
Solve systems of two linear equations using the Cramer Rule determinant method. Get step-by-step solutions for unique, infinite, or no solution cases.
Convert numbers between any two bases from binary (base 2) to base 36. Supports hexadecimal, octal, binary, and all custom bases.
Compute derivatives of polynomial expressions using the power rule. Get step-by-step differentiation and evaluate at any point.
Calculate sine, cosine, tangent and their reciprocals for any angle. Also find angles from trig values with reference angles.
Explore the unit circle by entering any angle. See coordinates, trigonometric values, reference angles, and the quadrant instantly.
Factor quadratic polynomials (ax² + bx + c) into their factored form with step-by-step work. Find the factors and zeros of any quadratic expression.
Evaluate polynomials at any point, see the degree, and get step-by-step substitution work. Enter coefficients for polynomials of any degree.
Check if any number is prime using trial division. Find its prime factorization, count all divisors, and see step-by-step primality verification.
Calculate the factorial of any number from 0 to 170. Shows the step-by-step multiplication, digit count, and trailing zeros.
Calculate the nth Fibonacci number, view the full sequence, and get the sum. Uses iteration and the Binet formula for verification. Free, instant, and accurate.
Apply the law of sines to solve triangles. Enter known side-angle pairs to find missing sides, angles, and the circumradius.
Solve triangles using the law of cosines. Find missing sides (SSS) or angles (SAS) with step-by-step work. Free, instant, and accurate.
Compute inverse trigonometric functions: arcsin, arccos, and arctan. Get results in degrees and radians with the principal value.
Calculate definite integrals numerically using Simpsons rule with step-by-step formula breakdown. Supports polynomial, trig, and exponential functions.
Compute limits of functions as x approaches any value. Evaluate left-hand, right-hand, and two-sided limits with approach tables.
Sum mathematical series from any start to end value. Supports expressions with n, exponents, and common mathematical functions.
Compute Taylor series of common functions like e^x, sin(x), cos(x) around any center point. Adjust the expansion order for accurate polynomial approximation.
Compute vector operations including addition, subtraction, dot product, cross product, magnitudes, and the angle between vectors in 2D or 3D.
Compute the cross product of two 3D vectors. Shows the resulting vector, magnitude, unit vector, and area of the parallelogram.
Calculate the dot product of two vectors, the angle between them, and determine if they are orthogonal. Supports 2D and 3D vectors.
Solve proportion equations a/b = c/d for any missing value. Enter three known values and find the fourth using cross-multiplication.
Find the least common denominator (LCD) for fractions. Convert each to equivalent form using LCM step-by-step calculations and scaling factors.
Calculate what grade you need on your final exam to achieve your target overall grade. Handles weighted grading systems with impossible target detection.
A playful compatibility calculator using a deterministic L-O-V-E letter algorithm. Includes zodiac sign matching for fun social entertainment at parties.
