Everyday and advanced math calculators. — 51 free tools.
A fast online basic calculator with memory (M+, M-, MR, MC), keyboard support, history tape, percentages and voice input.
★Full scientific calculator with trigonometry, logarithms, powers, factorial, constants, a graph plotter and equation solver.
★Solve every percentage problem: X% of Y, increase, decrease, difference, reverse percentage and profit percentage with steps.
★Add, subtract, multiply and divide fractions and mixed numbers with simplification and decimal conversion, step by step.
★Calculate mean, median, mode, range, sum, weighted average, standard deviation and variance from a list of numbers.
★Free area calculator for rectangle, square, triangle, circle, parallelogram and trapezoid with instant results.
★Calculate the volume of a cube, box, sphere, cylinder or cone instantly and free.
★Compute a circle’s area, circumference and diameter from the radius.
★Find a triangle’s area from base and height and its perimeter from three sides.
★Calculate the hypotenuse of a right triangle from the two legs using a² + b² = c².
★Solve any quadratic equation ax² + bx + c = 0 and see the roots and discriminant.
★Find the greatest common divisor (HCF) and least common multiple of two numbers.
★Raise any base to any power, including negative and fractional exponents.
★Find the square root, cube root and any nth root of a number.
★Simplify ratios and solve proportions A:B = C:D instantly.
★Find X% of any number instantly.
★Find what percentage one number is of another.
★Calculate the percentage change between two values.
★Increase a number by a given percentage.
★Decrease a number by a given percentage.
★Find the percentage difference between two numbers.
★Calculate percent error between measured and actual values.
★Find the original number before a percentage was added or removed.
★Add a list of numbers together.
★Subtract numbers in sequence.
★Multiply numbers together.
★Divide two numbers and get quotient and remainder.
★Find the remainder of a division (a mod b).
★Calculate the factorial n! of a number.
★Calculate permutations nPr.
★Calculate combinations nCr.
★Calculate log base 10, natural log and log of any base.
★Calculate the antilogarithm of a number.
★Calculate the square of a number.
★Calculate the cube of a number.
★Find the reciprocal (1/x) of a number.
★Find the absolute value of a number.
★Round a number to a chosen number of decimal places.
★Convert a number to scientific notation.
★Check whether a number is prime.
★Break a number down into its prime factors.
★List all factors (divisors) of a number.
★Find the nth Fibonacci number and the sequence.
★Find the least common multiple of numbers.
★Find the highest common factor (GCD) of numbers.
★Convert numbers between binary, octal, decimal and hexadecimal.
★Convert numbers to and from Roman numerals.
★Convert a decimal number into a simplified fraction.
★Convert a fraction to a decimal value.
★Solve a proportion A/B = C/X for the missing value.
★Project exponential growth or decay over time.
Browse allfreecalculators.in tools in this topic. Each calculator includes a clear formula, examples, FAQs, schema markup, related internal links and practical guidance for users, Google Search and AI answer engines.
Author: allfreecalculators.in Editorial Team
Reviewed by: allfreecalculators.in Accuracy Review Desk
Last updated: June 23, 2026
Editorial policy: We explain formulas, assumptions, limitations and examples in plain language and update pages when methods, rates or standards change.
Fact-checking policy: Calculator formulas are reviewed against standard mathematical, financial, scientific or public reference methods where applicable.
Sources: Standard formulas, official government references where relevant, public methodology references and calculator-specific documentation.
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