We have updated our website calculator as well as our iPhone®, Android™ and BlackBerry® Apps to incorporate the 2015 Ontario Discount Rate, which is the same as the 2014 rate.

The apps are available immediately for download. Be sure to update them when you receive the notification on your smartphone.

Our app is also available for the new iOS8 operating system.

Watch for your hard copy of the McKellar Slide Rule coming in the mail!