Free Online Math Calculators

Browse our collection of free online math calculators. From basic arithmetic to square roots, percentages, fractions, and scientific calculations — all free, no registration required.

• Basic Free Online Calculator Service

  Free basic online calculator. Add, subtract, multiply, and divide with ease. Simple and fast.

• Engineering Calculator

  Free online engineering calculator with sin, cos, tan, log, ln, powers, roots, factorials, memory and more. Supports DEG/RAD mode.

• Online Square Root Calculator

  Calculate the square root of any number instantly. Free online square root (√) calculator.

• Square Calculator (x², x³, xⁿ)

  Calculate squares (x²), cubes (x³), and any power (xⁿ). Includes a perfect squares table from 1 to 20. Free online square calculator.

• Factorial Calculator (n!)

  Calculate factorial (n!) instantly. Includes a factorial table from 0! to 20!. Free online factorial calculator.

• Fibonacci Sequence Calculator

  Find the nth Fibonacci number or list the Fibonacci sequence. Free online Fibonacci sequence calculator.

• Area Calculator

  Calculate the area of circles, rectangles, triangles, trapezoids, and parallelograms. Free online area calculator with formulas.

• Volume Calculator

  Calculate the volume of cubes, cuboids, spheres, cylinders, and cones. Free online volume calculator with formulas.

• Modulo Calculator (a mod b)

  Calculate the remainder and quotient of any division. Free online modulo (mod) calculator.

• Arithmetic Sequence Calculator

  Find the nth term and sum of an arithmetic sequence. Free online arithmetic sequence calculator with sequence display.

• Geometric Sequence Calculator

  Find the nth term and sum of a geometric sequence. Free online geometric sequence calculator with sequence display.

• Angle Converter

  Convert angles between degrees (°), radians (rad), and gradians (grad). Free online angle converter.

• Number Base Converter

  Convert numbers between binary (2), octal (8), decimal (10), and hexadecimal (16). Free online number base converter.

• Free Online Percent Calculator – Quick and Easy Calculation

  Calculate percentages easily. Find what percent of a number is, percent increase/decrease, and more.

• Binary converter

  Convert between decimal and binary numbers instantly. Free online binary converter and calculator.

• Online Free Power Calculator

  Calculate powers and exponents. Includes powers of 2 table. Free online power (exponent) calculator.

• Ssaljip Calculator

  Calculate real estate investment yield: gross and net rental return from purchase price, annual rent, and ownership costs.

• kg ↔ Pounds Converter

  Convert kilograms to pounds, grams, ounces, and stone. Also converts pounds to kg instantly.

• Fraction Calculator

  Add, subtract, multiply and divide fractions and mixed numbers. Simplifies results automatically. Free.

• GCD and LCM Calculator

  Calculate the Greatest Common Divisor (GCD) and Least Common Multiple (LCM) of two or more numbers. Free.

• Statistics Calculator

  Calculate mean, median, mode, standard deviation, variance, and more. Free online statistics calculator.

• Quadratic Equation Solver

  Free online quadratic equation solver. Find real and complex roots of ax² + bx + c = 0 using the quadratic formula. Shows discriminant and step-by-step results.

• Logarithm Calculator

  Free online logarithm calculator. Compute log base 10 (log₁₀), natural log (ln), log base 2, and any custom base logarithm instantly.

• Trigonometry Calculator

  Free online trigonometry calculator. Compute sin, cos, tan, arcsin, arccos, arctan in degrees or radians instantly.

• Permutation & Combination Calculator

  Free online permutation and combination calculator. Compute nPr (permutations), nCr (combinations), and factorials instantly.

• Prime Factorization Calculator

  Free online prime factorization calculator. Find prime factors, factor tree, exponent form, and all divisors of any number up to 10 million.

• Ratio Calculator

  Free online ratio calculator. Solve for missing values in A:B = C:D proportions, simplify ratios, and find equivalent ratios instantly.

• Matrix Calculator

  Free online matrix calculator. Perform 2×2 and 3×3 matrix addition, subtraction, multiplication, determinant, and transpose operations.

• Average Calculator

  Free online average calculator. Compute arithmetic mean, median, mode, weighted average, geometric mean, harmonic mean and more.

• Pythagorean Theorem Calculator

  Calculate the sides of a right triangle using the Pythagorean theorem. Enter any two sides to find the third.

• Scientific Notation Calculator

  Convert numbers to and from scientific notation. Perform arithmetic in scientific notation format.

• Percent Error Calculator

  Calculate percent error between experimental and theoretical values. Essential for science and math students.

• Speed Distance Time Calculator

  Calculate speed, distance, or time using the fundamental physics formula. Enter any two values to find the third.

• Density Calculator

  Calculate density, mass, or volume. Enter any two values to find the third using the density formula (D = M/V).

• Slope Calculator

  Calculate the slope, distance, and equation of a line between two points. Uses the slope formula m=(y2-y1)/(x2-x1).

• Rounding Calculator

  Round numbers to any decimal place. Round up, down, or to nearest value. Supports rounding to significant figures.

• Roman Numerals Converter

  Convert numbers to Roman numerals and vice versa. Easy online Roman numeral converter with full chart.

• Significant Figures Calculator

  Round numbers to a given number of significant figures. Perfect for chemistry, physics, and science calculations.

• Percentage Change Calculator

  Calculate percentage change between two values. Find percentage increase, decrease, or difference quickly.

• Derivative Calculator

  Calculate the derivative of any polynomial f(x) step by step. Enter a polynomial like 3x³−2x²+5x−7 and get f'(x) instantly. Free online calculus tool.

• Definite Integral Calculator

  Calculate definite integrals of common functions (xⁿ, sin, cos, eˣ, ln) using numerical integration. Free online calculus tool.

• Circle Area Calculator

  Calculate circle area and circumference using π to 5, 10, 15, or 20 decimal places. See how π precision affects results with side-by-side comparison.

• Triangle Calculator

  Calculate all sides, angles, area, and perimeter of any triangle. Supports SSS, SAS, AAS, and ASA input methods using the law of cosines and law of sines.

• Standard Deviation Calculator

  Calculate mean, median, mode, range, population and sample variance, and standard deviation for any list of numbers. Includes step-by-step formula breakdown.

• Z-Score Calculator

  Calculate Z-scores and percentiles instantly. Convert a value to a Z-score using mean and standard deviation, or convert a Z-score to its percentile rank.

• Probability Calculator

  Calculate simple probability, AND/OR probability for independent or dependent events, and conditional probability P(A|B). Includes complement, fraction, decimal, and percent output.

• Sphere Calculator

  Calculate sphere volume, surface area, and great circle circumference from radius or diameter. Compare results using π to 5, 10, 15, or 20 decimal places.

• Cylinder Calculator

  Calculate cylinder volume, total surface area, lateral surface area, and base area from radius and height. Compare results using π to 5, 10, 15, or 20 decimal places.

• Cone Calculator

  Calculate cone volume, total surface area, lateral surface area, base area, and slant height from radius and height. Compare results using π to 5, 10, 15, or 20 decimal places.

• Cube Root Calculator

  Calculate the cube root (∛n) or any nth root of any number. Supports negative cube roots. Choose decimal precision from 5 to 20 places. Instant verification included.

• Linear Equation Calculator

  Solve linear equations (ax + b = c) and systems of 2 linear equations step by step. Handles no solution and infinite solutions cases. Free online math solver.

• Confidence Interval Calculator

  Calculate confidence intervals using Z-distribution (σ known) or t-distribution (σ unknown). Supports 90%, 95%, and 99% confidence levels with margin of error and critical value reference table.

• Circle Area Calculator

  Calculate the area of a circle from its radius or diameter. Free online circle area calculator using the formula A = π × r².

• Rectangle Area Calculator

  Calculate the area of a rectangle by entering width and height. Free online rectangle area calculator with the formula A = w × h.

• Triangle Area Calculator

  Calculate the area of a triangle from base and height. Free online triangle area calculator with the formula A = (a × h) / 2.

• Trapezoid Area Calculator

  Calculate the area of a trapezoid from parallel bases and height. Free online trapezoid area calculator with the formula A = (a + b) × h / 2.

• Parallelogram Area Calculator

  Calculate the area of a parallelogram from base and height. Free online parallelogram area calculator with the formula A = a × h.

• Quadrilateral Area Calculator

  Calculate the area of a rectangle or quadrilateral by entering width and height. Free online area calculator with the formula A = w × h.

• Random Number Generator

  Generate random numbers between any min and max. Choose count, allow or exclude duplicates. Free online random number generator.

• Hex Calculator

  Perform addition, subtraction, multiplication, division and bitwise operations (AND, OR, XOR, NOT) on hexadecimal numbers. Free online hex calculator.

• Half-Life Calculator

  Calculate remaining quantity after radioactive decay using half-life formula. Find elapsed time or half-life from initial and remaining amounts. Free online calculator.

• Variance Calculator

  Calculate population variance, sample variance, standard deviation, mean, and range from a data set. Supports comma-separated or line-by-line input. Free online.

• Number List Calculator

  Paste numbers separated by spaces, commas, tabs, or newlines. Instantly get count, sum, mean, median, mode, min, max, range, variance, and standard deviation.

Free Online Calculator