This script will format a telephone number entered into a text box. Numbers can be entered as 1234567890 and will automatically be formatted as (123)456-7890.

Ever wonder how fast your tires are rotating at a certain speed and at what G-force? The script in this tutorial will figure it out for you!

Computers read and store the decimal numbers we see everyday (1, 5, 10, 100, etc.) as binary numbers, a number of just 1's and 0's. All that you do is enter the decimal number and the script will output the binary equivalent! It is a binary converter!

This script will convert celsius to fahrenheit or fahrenheit to celsius, all you have to do is fill in the prompts and the conversion will appear in an alert box!

Having trouble converting to Roman numerals? This script should do the trick!

Converts a Unix timestamp (in seconds) to a human-readable date. (Based on the standard Unix epoch of 01/01/1970 at 00:00:00 GMT)

This script takes a number and converts it to its English equivalent. If you enter 45678 in the number box and click the appropriate button, Forty Five Thousand Six Hundred Seventy Eight appears in the lower box.

Pass a range of numbers to this JavaScript function and it will return a random number within that range. For example, passing the range of [1, 158] would return a number such as 37, 141, 18, etc. Awesome!

This script initiates a countdown based on the number you enter and ends at zero.

The computer will thinks of a random number between 0 and 49. Just guess it! Higher and lower hints included!

Play the JavaScript version of Guess-A-Number. First, select a number range and then try to guess the number the computer has chosen.

Learn how to generate a random number in java script