Everyday Math

Percentages, fractions, ratios, averages, factors, rounding and scientific notation.

• Booklet Creep Calculator

  How far the centre pages of a saddle-stitched booklet push out past the cover, from the page count and the paper caliper, and how much to shift the pages on any sheet.

• Percentage Calculator

  Find a percentage of a number, what percent one number is of another, or the whole from a part and its percentage.

• Percentage Change Calculator

  Measure the increase or decrease from an original value to a new value, and the symmetric percentage difference between them.

• Fraction Calculator

  Add, subtract, multiply or divide two fractions and reduce the result.

• Ratio Calculator

  Simplify a two-part ratio and convert each part into a share of the whole.

• Proportion Calculator

  Solve the fourth value that makes two ratios equal.

• Average Calculator

  Find the mean, median, mode, range, sum and count of a list of values.

• Weighted Average Calculator

  Average values that contribute with different weights.

• Standard Deviation Calculator

  Calculate variance and standard deviation for a population or sample.

• Rounding Calculator

  Round once to a chosen decimal place or to the nearest multiple, using nearest, floor, ceiling or half to even.

• Greatest Common Factor Calculator

  Find the largest whole number that divides two integers exactly.

• Least Common Multiple Calculator

  Find the smallest positive multiple shared by two whole numbers.

• Scientific Notation Calculator

  Convert a decimal number to normalized scientific and E notation.

• Scientific Calculator

  Evaluate powers, roots, logarithms and trigonometric functions in degrees.

• Factor Calculator

  List every positive factor of a whole number and show its prime factorization.

• Slope Calculator

  Find the slope, rise, run, angle and line equation through two coordinate points.

• Graphing Calculator

  Graph a quadratic or linear function and inspect its value, vertex and x-intercepts.

• Aspect Ratio Calculator

  The aspect ratio of a width and height in lowest terms, such as 16:9, or the missing side when you resize an image or screen and keep its shape.

• Screen Size Calculator

  The width, height and area of a TV, monitor or phone screen from its diagonal size and aspect ratio, or the diagonal from its width and height.

• PPI Calculator

  Pixels per inch of a screen from its resolution and diagonal, with dot pitch and physical size.