Click here to watch a short video on how to use this tool. (It will open in a new window.)

Attention Website Owners/Webmasters! Do you think your visitors would benefit from the use of this tool? You can now download and install it on your own website/s absolutely free. We have detailed instructions on how to do it and it only takes a minute.

We made it available in two formats:

1. You can find a copy-and-paste version here.

2. If you are operating a WordPress blog, we also developed a plug-in version of the calculator. You can find it here.

Both of these versions can be customized very easily to match the color scheme of your website. By downloading and installing the calculator, you agree not to modify the source code in any way.