Skip to main content

Calculators

Calculate percentage change, hours between times, decimal hours, age, aspect ratio, DPI and print size free. 11 simple calculators with instant results.

Tools in Calculators

  • Age Calculator Work out an exact age, or the time between any two dates, in years, months and days.
  • Aspect Ratio Calculator Find the aspect ratio of any width and height, and get the matching dimension for a target size.
  • Business Days Calculator Count business days between two dates, or add business days to a date, skipping weekends and US federal holidays.
  • DPI Calculator Calculate an image's DPI from its pixel dimensions and the size you want to print it at.
  • Decimal Hours Calculator Convert hours and minutes into decimal hours for timesheets, and decimal hours back into time.
  • Hours Between Two Times Work out the hours and minutes between a start and end time, including overnight shifts and breaks.
  • PPI Calculator Calculate the pixel density of a screen or digital image from its resolution and diagonal size.
  • Percentage Difference Calculator Calculate the percentage difference between two numbers, measured against their average.
  • Percentage Increase Calculator Work out how much a number rose or fell as a percentage, from a starting value to a new one.
  • Pixels to Inches Calculator Convert pixel dimensions to inches, centimetres and millimetres at any DPI or PPI.
  • Print Size Calculator See how large an image can be printed at a chosen DPI, in both inches and centimetres.
  • Reverse Percentage Calculator Find the original value before a percentage increase, decrease, discount, or markup was applied.