Free · See the smallest and largest values

Number List Extent Finder

Find both ends of a number list and the distance between them.

  • Real extent calculation
  • Private in your browser
  • Text, CSV, and JSON

Try the calculation

This tool uses simple-statistics 7.10.0. Start with the example or enter your own numbers.

Your numbersCommas, spaces, and new lines all work
The library runs in this tab. Your numbers are not uploaded or saved.
Result
Ready for your numbersChoose “Find the extent” to see the answer.

Powered by simple-statistics 7.10.0, an open-source JavaScript library available under the ISC license.

Three simple steps

How to use it

  1. Use the example or enter your own numbers.
  2. Set any option that appears below the number list.
  3. Press “Find the extent,” then read or download the result.

Your numbers stay on this device

simple-statistics runs inside this browser tab. Bookify does not upload or save your list. The tool explains the calculation, but a number cannot judge data quality, study design, or what caused a pattern.