For quick 3/5 rule eligibility calculation, please try the following:
https://beta.theglobeandmail.com/news/politics/citizenship-calculator/article34574747/?ref=http://www.theglobeandmail.com&
https://beta.theglobeandmail.com/news/politics/citizenship-calculator/article34574747/?ref=http://www.theglobeandmail.com&