Math Calculators
Solve everyday arithmetic, algebra, geometry and statistics problems with a growing set of fast, privacy-friendly calculators.
Binary CalculatorPerform 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 CalculatorCalculate 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 CalculatorCompute 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 CalculatorCalculate 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 CalculatorCalculate 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 CalculatorCalculate 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 CalculatorCalculate 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.