Type or make two numbers have the sum equalled or less 18, then clicking buttons for the sum of two that numbers , view the right; wrong choices and the ratio.

Calculate the percentage of increase/decrease between two units. A simple, effective script.

This compounding interest calculator can show your visitors how much they can save for retirement or other purpose. It also provides your users with the ability of viewing an amortization schedule showing what they will earn during each month. You can easily adjust the style section to make it match your site's color scheme.

Find out the circumference of a circle by entering its radius. Very simple!

Use this script to convert bytes, kilobytes, megabytes, and gigabytes. Quick and easy to use.

This script will factor and solve for both values of X, any quadratic equation that has real number solutions.

Shows air distances between selected world cities.

A manual Beats per Minute (BPM) counter for DJs. Counts the beats-per-minute of a song by tapping a key or the mouse to the beat of a song. Simply click on the page to start the time then tap any key to the beat. Cool.

Convert latitude and longitude from degree decimal to degree, minutes, and seconds and vice versa. This script will also find the farthest point from the point entered, as well as the distance.

This script uses array to store tha values users submit then will alert the largest, smallest number and sum of the numbers.

Change inches to centimeters and back using this short, sweet script. Very easy to use, just type in the number and click.

A fraction calculator that performs addition, subtraction, multiplication, and division on two fractions. It also reduces the result to the lowest terms.

Using basic theory and this calculator, you can quickly find the answers to your chemistry stoichiometry equations.

This is another script to make the basic calculator on your web page.

This script will validate an ABA routing number according to a given algorithm. (Although the number may be valid, it may not be actually assigned to a financial institution.)