Math Calculators

Solve everyday arithmetic, algebra, geometry and statistics problems with a growing set of fast, privacy-friendly calculators.

Binary Calculator

Perform addition, subtraction, multiplication, or division on two non-negative integers and see the result rendered in any of four numeral systems — binary (base 2), decimal (base 10), hexadecimal (base 16) or octal (base 8). Type the two values as plain decimal numbers; the calculator treats them as if they were written in the chosen system and shows the answer in that same system. For example, with Numeral system = Binary, enter A = 204 and B = 170 to compute 11001100 + 10101010 = 101101110.

Circle Area Calculator

Calculate the area of any circle from its radius. Pick any unit for the radius — the result is shown in square meters and re-expressed in the unit you chose, so you always see a number that fits the input. Useful for plates, wheels, plots, pizzas, pipes, lenses, and any round surface.

Mean, Median, Mode, Range Calculator

Compute the four classical descriptive statistics — mean (average), median (middle value), mode (most frequent value), and range (max − min) — from a list of numbers. Paste any list separated by commas, spaces, semicolons, or newlines.

Percent Error Calculator

Calculate the percent error between an observed (measured) value and a true (accepted) value. Useful for lab reports, measurement accuracy checks, and forecast-vs-actual comparisons.

Percentage Calculator

Calculate percentages in five ways: X% of Y, what percent X is of Y, add or subtract a percentage, and percent change between two numbers. Useful for discounts, tips, interest rates, grade scores, and growth rates.

Probability Calculator

Calculate the probability of events A and B (intersection, union, either, neither, or conditional) assuming independence. Enter each probability between 0 and 1, then choose the operation.

Rectangle Area Calculator

Calculate the area of any rectangle from its width and height. Pick any unit for each side — the result is shown in square meters and re-expressed in the unit you chose, so you always see a number that fits the inputs you entered. Useful for floors, walls, plots, screens, paper, tiles, and any flat surface.

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Financial Calculators

Plan loans, amortisation schedules, mortgage payments, and salary breakdowns with calculators that work entirely in your browser.

Fitness Calculators

Estimate your body composition, daily energy needs, and macronutrient targets with a set of fast, privacy-friendly calculators.