Category · 20 calculators
Mathematics
Percentage calculations, rule of three, online calculator, random number generator and further mathematical tools for everyday and school use.
20 calculators
Percentage Calculator
What is X% of Y, what percentage is one value of another, and by how much did it change? The calculator shows the result and the formula with your numbers.
Open calculator PopularRule of Three Calculator
Solve direct and inverse proportion problems: enter the known pair and the new value to get the result, a three-step solution and the formula used.
Open calculator PopularFraction Calculator
Add, subtract, multiply or divide two fractions. The result is reduced to lowest terms automatically and is also shown as a decimal number.
Open calculatorOnline Calculator
A browser calculator for the four basic operations, with a percent key, sign change, backspace and chained calculations across several steps.
Open calculatorSquare Meter Calculator
Work out the area in square meters of rectangular, L-shaped or triangular rooms and plots from length and width, or from base and height.
Open calculatorTriangle Calculator
From three sides, two sides and the included angle, or one side and two angles, the tool works out all sides and angles plus the area and perimeter.
Open calculatorCircle Calculator
Enter the radius, diameter, circumference or area of a circle and get the other three values, together with the formulas used for them.
Open calculatorCylinder Calculator
Enter radius and height to get a cylinder's volume, base area, lateral surface area and total surface area, each shown with its formula.
Open calculatorVolume Calculator
Volume and surface area of a cube, cuboid, cylinder, sphere, cone or square pyramid: enter the dimensions and read the result with the volume formula.
Open calculatorCubic Meter Calculator
Calculate the volume of a room, container or load from length, width and height in meters, with the result in cubic meters, liters, cm³ and mm³.
Open calculatorSpeed Calculator
Enter two of distance (km), time and speed (km/h) to get the third. Speed is also shown in m/s, distance in meters and time in hours, minutes and seconds.
Open calculatorScale Calculator
Convert real-world lengths to model or drawing size and back at any 1:X scale. Results in mm, cm and m, plus common scales such as 1:87 (H0) and 1:100.
Open calculatorSlope and Gradient Calculator
Enter rise and run, a percentage or an angle to get the slope in percent and degrees, the ratio 1:X and, from rise and run, the sloped length.
Open calculatorMean Calculator
Enter a list of numbers to get the arithmetic mean, median and mode, plus the sum, count, minimum, maximum, range and the values in sorted order.
Open calculatorStatistics Calculator
Get the standard deviation and variance (population and sample), mean, median, quartiles, interquartile range and range for your data set.
Open calculatorRandom Number Generator
Generate one or up to 10,000 random integers between a minimum and maximum of your choice, optionally without repeats, for example for prize draws.
Open calculatorRoman Numeral Converter
Convert numbers from 1 to 3999 into Roman numerals or turn Roman numerals back into Arabic numbers. Invalid notations are detected and flagged.
Open calculatorNumber System Converter
Enter a positive whole number in decimal, binary, octal or hexadecimal and see its value in all four number systems, with binary in groups of four.
Open calculatorCombinatorics Calculator
How many arrangements or selections are possible? Permutations and combinations with and without repetition from n and k, each with its formula.
Open calculatorPixel Calculator
From pixel width, height and DPI the calculator derives the print size in cm and inches, the megapixels and aspect ratio, plus a list of common resolutions.
Open calculatorNo calculator found.
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