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Free Online Calculators

20 tools

From quick everyday sums to statistics, geometry, and number theory, our free calculators give instant, accurate answers right in your browser.

All Calculators Finance Health Text Developer AI Weather World Tamil Entertainment SEO Security Utility Spirituality Image PDF Date & Time Lifestyle
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Basic Calculator Perform everyday arithmetic instantly - addition, subtraction, multiplication, and division - with a clean, easy-to-use online calculator. Scientific Calculator Solve advanced math problems with trigonometry, logarithms, exponents, and more. Perfect for students, engineers, and scientists. Percentage Calculator Find percentages, calculate discounts, percentage change, and more. A versatile tool for shopping, finance, and everyday math. All Calculators Browse every calculator across all categories - finance, health, math, calendar, and spirituality - in one convenient place. Age Calculator Calculate your exact age in years, months, and days from your date of birth. Also shows the upcoming birthday countdown. Countdown Timer Count down to any upcoming event - weddings, exams, holidays, or product launches. Get days, hours, minutes, and seconds remaining. Fraction Calculator Add, subtract, multiply, and divide fractions with step-by-step solutions. Also simplifies fractions to their lowest form. Random Number Generator Generate truly random numbers within any range. Useful for lottery picks, statistics, games, simulations, and decision-making. Triangle Calculator Calculate the area, perimeter, angles, and sides of any triangle using Heron's formula, SSS, SAS, or ASA methods. Statistics Calculator Calculate mean, median, mode, range, variance, and standard deviation for any dataset. Ideal for students and data analysts. Standard Deviation Calculator Compute population or sample standard deviation and variance for any set of numbers. See step-by-step working. Average Calculator Calculate the arithmetic mean, weighted average, or median of a list of numbers. Simple and fast for any dataset. Ratio Calculator Simplify ratios, find missing values in proportions, and scale ratios up or down. Handy for recipes, maps, and finance. Number Base Converter Convert numbers between binary, octal, decimal, and hexadecimal. Essential for programmers, students, and digital electronics. Prime Number Checker Check if any number is prime, find prime factors, and list all primes up to 10,000 with the Sieve of Eratosthenes. LCM & GCD Calculator Find the Least Common Multiple (LCM) and Greatest Common Divisor (GCD) of two or more numbers instantly. Factorial Calculator Calculate the factorial (n!) of any number from 0 to 170 with exact BigInt precision and step-by-step expansion. Quadratic Equation Solver Solve quadratic equations (ax² + bx + c = 0) using the quadratic formula. Shows real and complex roots with steps. Roman Numeral Converter Convert between Arabic numbers and Roman numerals (I, V, X, L, C, D, M). Supports values from 1 to 3,999. Number to Words Convert any number up to 999 trillion into English words. Perfect for writing checks, invoices, and legal documents.

About Calculators Tools

This collection covers the calculations people reach for most often - percentages and discounts, fractions, averages and standard deviation, triangles, prime numbers, factorials, and quadratic equations - plus handy converters for Roman numerals, number bases, and numbers into words. Each tool returns its result instantly and, where it helps learning, shows the working behind it.

Every calculator is free, needs no sign-up, and runs entirely in your browser, so your inputs never leave your device. For money-related math see the Finance tools, and for date and time math see Date & Time.

Frequently Asked Questions

Are these calculators free to use?

Yes. Every calculator is completely free, with no sign-up, no limits, and no watermarks.

Do the calculators show step-by-step working?

Many do - for example the fraction, standard deviation, and quadratic solvers display the steps, not just the answer.

Do I need to install anything?

No. They run in any modern web browser on desktop or mobile, with nothing to download.