Math Calculators

Free online fraction calculator to add, subtract, multiply, and divide fractions. Get the result reduced to lowest terms, plus its decimal and mixed number form, step by step.

Calculate the mean, median and mode of any list of numbers instantly. Enter your data separated by commas or spaces and get the average, count, sum, minimum, maximum and range at once.

Free online power and root calculator. Raise any base to any exponent, including negative and fractional exponents, and find square, cube, and nth roots instantly with clear formulas.

Calculate the final price after a percentage discount, or find out what discount percentage separates two prices. See exactly how much money you save on any purchase.

Convert numbers to Roman numerals and Roman numerals to numbers instantly. Supports 1 to 3999 with subtractive notation. No sign-up, instant results.

Free online GCD and LCM calculator. Find the greatest common divisor and least common multiple of two numbers instantly, computed with the Euclidean algorithm.

Free online quadratic equation solver. Enter a, b, and c to find the roots x₁ and x₂ of ax²+bx+c=0 instantly, with the discriminant and the quadratic formula explained.

Free scientific notation converter. Turn any number, large or small, into scientific notation (m × 10ⁿ) and E notation instantly, with the mantissa and exponent shown clearly.

Free combinations and permutations calculator. Enter n and r to get nCr, nPr and the factorial of n instantly, with clear formulas and worked examples.

Free online logarithm calculator. Compute the logarithm of any number in any base, plus the natural logarithm (ln, base e) and the common logarithm (log₁₀), with the exact formula.

Calculate a weighted average instantly. Enter each value with its weight and get the result, the number of values and the total weight. Ideal for grades with different percentages or any weighted mean.

Free online area and perimeter calculator for the most common geometric shapes. Compute the area and perimeter of a circle, square, rectangle, or triangle instantly, with results that update as you type.

Free online prime number checker and factorization calculator. Instantly find out if a number is prime and break it down into its prime factors as you type.

Count words, characters (with and without spaces), sentences and paragraphs in your text instantly. Free online counter for essays, articles, tweets, SEO meta descriptions and more.

Find out what grade you need on your final exam to reach the grade you want. Enter your current grade, the weight of the final and your desired grade to get the score you must earn.

Free online speed, distance and time calculator. Enter any two values to find the third using v = d / t, d = v × t and t = d / v, with instant results in km/h, km and hours.

Free online Ohm's law calculator. Solve for voltage, current, resistance or power in a circuit using V = I × R and P = V × I. Enter any two values and get the third instantly.

Free online converter for fraction to decimal and decimal to fraction. Enter a numerator and denominator to get the decimal value, or a decimal number to get the reduced fraction instantly.

Free online density calculator. Find density, mass, or volume from the other two using ρ = m / V. Solve any of the three quantities instantly with clear, consistent units.

Work out how many litres of paint you need from the wall area (width × height), the number of coats, and the paint coverage in m²/L. Get an instant estimate before you head to the store.

Calculate how many tiles you need for a floor from the room dimensions and the size of each tile, plus a waste percentage for cuts and breakages. Get the exact tile count in seconds.

Calculate the volume of concrete for a slab or floor from its length, width and thickness, plus an estimate of how many bags of premixed concrete you need. Fast, free and metric-based (m³).

Free online number base converter. Instantly convert any number between binary (base 2), octal (base 8), decimal (base 10) and hexadecimal (base 16) as you type, with clear results.

Calculate exactly how much oil to add to your gasoline for a 2-stroke engine. Enter the fuel amount and the mix ratio (50:1, 40:1, 25:1...) and get the oil in milliliters instantly.

Free online multiplication table generator. Create the times table of any number, from 1 to 12 or beyond, instantly as you type.

Solve the Pythagorean theorem online. Enter two legs to find the hypotenuse, or the hypotenuse and one leg to find the other side. Instant results with a²+b²=c².

Calculate your GPA on the US 4.0 scale. Add each course with its letter grade and credit hours to get your credit-weighted grade point average instantly.

Calculate the volume of the most common 3D shapes: cube, rectangular box, sphere, cylinder and cone. Pick a shape, enter the dimensions and get the volume instantly.

Calculate percent error between a measured (experimental) value and the true (theoretical) value. Enter both numbers and get the percent error and absolute error instantly.

Find the equation of a straight line from two points. Enter (x₁, y₁) and (x₂, y₂) to get the slope m, the y-intercept b and the slope-intercept form y = mx + b instantly.