This is simple
HST calculator for harmonized sale tax calculation in Ontario province in Canada.
Calculator is very easy customizable: you can change color of background, borders and text to match your web site's theme and change widget title.
- Extract the zip file and just drop the contents in the wp-content/plugins/ directory of your WordPress installation
- Activate the plugin through the 'Plugins' menu in WordPress
- Go to Appearance -> Widgets and add the widget to your website sidebar
Please visit
plugin home page for more detailed installation and setup instructions