90 calculators
Area & Perimeter
Mathematics
Calculate area and perimeter for seven shapes: circle, rectangle, square, triangle, trapezoid, parallelogram, and hexagon. Includes interactive diagrams.
★ 4.938K uses
Average Calculator
Mathematics
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.
★ 4.939K uses
Basic Calc
Mathematics
A full-featured basic calculator with number pad, history tape, and order-of-operations support. Perfect for quick calculations with a running log.
★ 4.925K uses
Arbitrary Precision
Mathematics
Perform exact arbitrary-precision integer arithmetic with BigInt. Add, subtract, multiply, divide, and exponentiate numbers with hundreds of digits.
★ 4.910K uses
Binary & Hex
Mathematics
Convert between Decimal, Binary, Hex, and Octal with positional value breakdown. Perform arithmetic and bitwise operations (AND, OR, XOR, NOT, shifts).
★ 4.910K uses
Circle Calculator
Mathematics
Find radius, diameter, circumference, and area from any single known circle measurement. Shows reverse engineering steps for all four circle properties.
★ 4.932K uses
Common Factors
Mathematics
Find all common factors shared by two numbers. Lists every divisor that divides both numbers evenly, with the Greatest Common Factor (GCF) highlighted.
★ 4.931K uses
Confidence Interval
Mathematics
Calculate confidence intervals for a population mean. Breaks out the Margin of Error (MOE), critical Z-value, and standard error.
★ 4.923K uses
Conversion
Mathematics
Convert between hundreds of units across 8 categories including weight, length, temperature, volume, area, speed, and currency.
★ 4.910K uses
Date Calculator
Mathematics
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.
★ 4.918K uses
Distance Calculator
Mathematics
Calculate the Euclidean distance between two points in 1D, 2D, or 3D space. Shows the distance formula, step-by-step calculation, midpoint, and slope.
★ 4.946K uses
Exponent Calculator
Mathematics
Raise any base to any power including negative, fractional, and decimal exponents. Shows expanded form, scientific notation, power-rule breakdown, and.
★ 4.946K uses
Factor Calculator
Mathematics
Find all factors of any positive integer with a complete factor pairs table, total factor count, sum of factors, and primality test.
★ 4.932K uses
Fraction Calculator
Mathematics
Add, subtract, multiply, and divide fractions with step-by-step solutions. Shows LCM for common denominators and simplifies using GCD.
★ 4.946K uses
Fraction Converter
Mathematics
Convert fractions to decimals, decimals to fractions, and mixed numbers to decimals. Automatically simplifies fractions using GCD.
★ 4.923K uses
Greatest Common Factor
Mathematics
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.
★ 4.911K uses
GDP Calculator
Mathematics
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.
★ 4.911K uses
GPA Calculator
Mathematics
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.
★ 4.911K uses
Final Grade
Mathematics
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.
★ 4.925K uses
Half-Life Calculator — Exponential
Mathematics
Calculate radioactive decay, carbon dating, and drug elimination using the exponential decay formula. Free, instant, and accurate.
★ 4.953K uses
Height Predictor
Mathematics
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.
★ 4.932K uses
LCM Calculator
Mathematics
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.
★ 4.911K uses
Log Calculator
Mathematics
Calculate logarithms in any custom base with the change of base formula explained step-by-step. Free, instant, and accurate.
★ 4.911K uses
Long Division
Mathematics
Perform long division with the traditional tableau format. Shows each step — divide, multiply, subtract, bring down — just like the classroom method.
★ 4.931K uses
Percentage
Mathematics
Calculate percentages in five different ways: what is X% of Y, X is what percent of Y, percent change, add or subtract a percentage.
★ 4.945K uses
Matrix Calculator
Mathematics
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.
★ 4.932K uses
Mean Median Mode
Mathematics
Calculate the mean, median, mode, sum, and range from any data set with step-by-step median breakdown for even-numbered datasets.
★ 4.952K uses
Number Sequences
Mathematics
Identify arithmetic, geometric, and Fibonacci sequences. Find common difference, common ratio, nth-term formula, and compute next terms.
★ 4.945K uses
Root Calculator
Mathematics
Calculate any nth root — square roots, cube roots, and beyond. Shows both radical form and fractional exponent equivalent with step-by-step verification.
★ 4.946K uses
P-value Calculator — Statistical Si
Mathematics
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.
★ 4.939K uses
Percent Error
Mathematics
Calculate percent error, absolute error, signed error, accuracy, and relative error between accepted and experimental values.
★ 4.931K uses
Permutations & Combos
Mathematics
Calculate permutations (nPr) and combinations (nCr) with step-by-step factorial breakdown. Toggle between order matters vs.
★ 4.951K uses
Prime Factors
Mathematics
Break any integer into its unique prime factors with an interactive factor tree. Detects perfect squares, cubes, and handles numbers up to one million.
★ 4.923K uses
Probability
Mathematics
Compute joint (A∩B), union (A∪B), conditional P(A|B), and complement probabilities for independent or mutually exclusive events with Venn diagram.
★ 4.917K uses
Right Triangle
Mathematics
Solve right triangles using the Pythagorean theorem and SOH CAH TOA trigonometry. Find sides, angles, area, and perimeter with a dynamic SVG triangle and.
★ 4.923K uses
Quadratic Solver
Mathematics
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.
★ 4.916K uses
Random Numbers
Mathematics
Generate cryptographically secure random numbers using Web Crypto API. Customizable range, count, decimal precision, unique values, and batch statistics.
★ 4.924K uses
Ratio Calculator
Mathematics
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.
★ 4.925K uses
Rounding Calculator
Mathematics
Round numbers to the nearest million, thousand, hundred, ten, unit, tenth, hundredth, thousandth, or ten-thousandth. Free, instant, and accurate.
★ 4.946K uses
Sample Size
Mathematics
Determine the ideal sample size for surveys and research studies. Adjust for population size, confidence level, and margin of error.
★ 4.917K uses
Scientific Calc
Mathematics
Full-featured online scientific calculator with trigonometric functions, logarithms, memory operations, and calculation history.
★ 4.910K uses
Sci Notation
Mathematics
Convert between decimal and scientific notation. Learn how the decimal point jumps left or right with an interactive movement visualization.
★ 4.923K uses
Slope Calculator
Mathematics
Calculate slope between two points with all three equation forms, distance, midpoint, and angle. Includes simplified fraction and interactive coordinate graph.
★ 4.925K uses
Standard Deviation
Mathematics
Compute standard deviation, variance, mean, median, range, and coefficient of variation from any dataset. Free online calculator with step-by-step results.
★ 4.916K uses
Statistics
Mathematics
Comprehensive descriptive statistics calculator with a dynamic box-and-whisker plot. Computes the five-number summary, quartiles, IQR, standard deviation.
★ 4.910K uses
Time & Hours
Mathematics
Calculate time differences between start and end times with automatic overnight detection, break deductions, and optional gross pay computation.
★ 4.918K uses
Time Card Calculator
Mathematics
Track weekly work hours with day-by-day entries. Calculates regular and overtime hours, handles 12hr/24hr time formats, overnight shifts, and optional pay.
★ 4.953K uses
Time Zone Calculator
Mathematics
Convert time between 24 time zones worldwide with business hours overlay. Green-yellow-gray color-coded grid shows the best meeting times across multiple.
★ 4.953K uses
Triangle Solver
Mathematics
Solve any triangle using SSS, SAS, or ASA input modes. Computes all sides, angles, area, and perimeter with dynamic SVG visualization.
★ 4.946K uses
Volume & Surface Area
Mathematics
Calculate volume and surface area of spheres, cubes, rectangular prisms, cylinders, cones, and pyramids. Free, instant, and accurate.
★ 4.938K uses
Z-Score Calculator — Free Online Ca
Mathematics
Calculate the Z-score from a raw score, population mean, and standard deviation. Visualizes the result on a standard normal distribution curve with shaded.
★ 4.939K uses
Roman Numerals
Mathematics
Convert numbers to Roman numerals and back, including date conversion. Features subtractive notation breakdown and tattoo verification.
★ 4.924K uses
Density Calculator
Mathematics
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.
★ 4.939K uses
Mass Calculator
Mathematics
Calculate mass, density, or volume using m = ρ × V. Shows planetary weight comparison on Earth, Moon, Mars, and Jupiter with unit conversions.
★ 4.918K uses
Weight Calculator
Mathematics
Calculate weight, mass, or gravitational acceleration using the W = mg formula. Compare weight across Earth, Moon, Mars, Jupiter, and the Sun.
★ 4.932K uses
Speed Calculator
Mathematics
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.
★ 4.925K uses
Molarity Calculator
Mathematics
Calculate molarity, mass, or volume of chemical solutions. Auto-detects compounds and shows step-by-step derivation of moles and concentration.
★ 4.946K uses
Mol Weight
Mathematics
Calculate molecular weight from any chemical formula with element breakdown and mass percentage composition. Supports hydrates and parentheses.
★ 4.952K uses
Time Duration
Mathematics
Calculate the exact duration between two dates and times down to the second. Supports business days mode and multiple output formats for project.
★ 4.931K uses
Day Counter
Mathematics
Count the exact number of days between two dates with precision down to the day. Includes business days exclusion, end-date inclusion toggle, and.
★ 4.917K uses
Day of Week
Mathematics
Find the day of the week for any date using Zeller's congruence. Features a perpetual calendar algorithm explanation and historical context.
★ 4.917K uses
Dice Roller
Mathematics
Roll virtual dice with crypto-grade randomness. Supports D4, D6, D8, D10, D12, and D20 with modifiers. Free, instant, and accurate.
★ 4.940K uses
pH Calculator
Mathematics
Calculate pH from hydrogen ion concentration, convert between pH and pOH, and classify solutions as acidic, basic, or neutral.
★ 4.939K uses
Correlation
Mathematics
Calculate the Pearson correlation coefficient between two variables. Shows r, r², strength, and direction with step-by-step work.
★ 4.917K uses
Descriptive Stats
Mathematics
Compute key descriptive statistics for any dataset: mean, median, mode, range, variance, standard deviation, quartiles, and IQR.
★ 4.932K uses
Equation Solver
Mathematics
Solve linear (ax + b = 0) and quadratic (ax² + bx + c = 0) equations instantly. Shows discriminant, roots, and step-by-step solutions.
★ 4.918K uses
System Solver
Mathematics
Solve systems of two linear equations using the Cramer Rule determinant method. Get step-by-step solutions for unique, infinite, or no solution cases.
★ 4.946K uses
Base Converter
Mathematics
Convert numbers between any two bases from binary (base 2) to base 36. Supports hexadecimal, octal, binary, and all custom bases.
★ 4.911K uses
Derivative Calc
Mathematics
Compute derivatives of polynomial expressions using the power rule. Get step-by-step differentiation and evaluate at any point.
★ 4.910K uses
Trig Calculator
Mathematics
Calculate sine, cosine, tangent and their reciprocals for any angle. Also find angles from trig values with reference angles.
★ 4.924K uses
Unit Circle
Mathematics
Explore the unit circle by entering any angle. See coordinates, trigonometric values, reference angles, and the quadrant instantly.
★ 4.940K uses
Factoring Calc
Mathematics
Factor quadratic polynomials (ax² + bx + c) into their factored form with step-by-step work. Find the factors and zeros of any quadratic expression.
★ 4.953K uses
Polynomial Calc
Mathematics
Evaluate polynomials at any point, see the degree, and get step-by-step substitution work. Enter coefficients for polynomials of any degree.
★ 4.910K uses
Prime Checker
Mathematics
Check if any number is prime using trial division. Find its prime factorization, count all divisors, and see step-by-step primality verification.
★ 4.947K uses
Factorial Calculator
Mathematics
Calculate the factorial of any number from 0 to 170. Shows the step-by-step multiplication, digit count, and trailing zeros.
★ 4.953K uses
Fibonacci Calculator
Mathematics
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.
★ 4.926K uses
Law of Sines
Mathematics
Apply the law of sines to solve triangles. Enter known side-angle pairs to find missing sides, angles, and the circumradius.
★ 4.947K uses
Law of Cosines
Mathematics
Solve triangles using the law of cosines. Find missing sides (SSS) or angles (SAS) with step-by-step work. Free, instant, and accurate.
★ 4.911K uses
Inverse Trig
Mathematics
Compute inverse trigonometric functions: arcsin, arccos, and arctan. Get results in degrees and radians with the principal value.
★ 4.947K uses
Integral Calc
Mathematics
Calculate definite integrals numerically using Simpsons rule with step-by-step formula breakdown. Supports polynomial, trig, and exponential functions.
★ 4.946K uses
Limit Calc
Mathematics
Compute limits of functions as x approaches any value. Evaluate left-hand, right-hand, and two-sided limits with approach tables.
★ 4.925K uses
Series Sum
Mathematics
Sum mathematical series from any start to end value. Supports expressions with n, exponents, and common mathematical functions.
★ 4.955K uses
Taylor Series
Mathematics
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.
★ 4.954K uses
Vector Calc
Mathematics
Compute vector operations including addition, subtraction, dot product, cross product, magnitudes, and the angle between vectors in 2D or 3D.
★ 4.932K uses
Cross Product
Mathematics
Compute the cross product of two 3D vectors. Shows the resulting vector, magnitude, unit vector, and area of the parallelogram.
★ 4.954K uses
Dot Product
Mathematics
Calculate the dot product of two vectors, the angle between them, and determine if they are orthogonal. Supports 2D and 3D vectors.
★ 4.940K uses
Proportion Solver
Mathematics
Solve proportion equations a/b = c/d for any missing value. Enter three known values and find the fourth using cross-multiplication.
★ 4.910K uses
Common Denominator
Mathematics
Find the least common denominator (LCD) for fractions. Convert each to equivalent form using LCM step-by-step calculations and scaling factors.
★ 4.939K uses
Test Score
Mathematics
Calculate what grade you need on your final exam to achieve your target overall grade. Handles weighted grading systems with impossible target detection.
★ 4.910K uses
Love Calculator
Mathematics
A playful compatibility calculator using a deterministic L-O-V-E letter algorithm. Includes zodiac sign matching for fun social entertainment at parties.
★ 4.918K uses
About Mathematics Calculators
From basic arithmetic to advanced algebra, geometry, statistics, and unit conversions, our math calculators handle it all. Every tool includes step-by-step formulas and visual diagrams to help you understand the math behind the numbers.
Browse our curated collection of mathematics calculators below. Each tool includes detailed formulas, educational content, and real-time results. Use the 90 calculators in this category to make informed decisions, solve problems, and get accurate answers instantly.
88+ calculators covering algebra, geometry, and statistics
Volume and surface area calculators for 3D shapes
Scientific notation, unit conversions, and matrix operations
Step-by-step formula explanations with visual diagrams
Frequently Asked Questions
Can these calculators handle negative numbers and decimals?
Yes, every calculator supports negative values, decimals, and scientific notation. The rounding calculator also lets you control how many decimal places appear in results.
Do I need an account to use them?
No account, no signup, no limits. Just enter your numbers and get results instantly — completely free.
Do the calculators show the steps?
Most calculators show the full work, including the formulas and intermediate calculations. The quadratic solver, factoring calculator, and derivative calculator are especially thorough about step-by-step solutions.
How do I calculate the slope of a line?
Slope is the change in y divided by the change in x between two points: (y₂ - y₁) / (x₂ - x₁). Our slope calculator does this instantly and shows the line on a graph with the intercept labeled.