Living as I do with one foot in the USA and one foot in Canada, I find myself sending letters from Canada to Canada, Canada to the USA, and sometimes carrying mail with me over the border to mail in the USA to the USA. I have one pile of Canada Post stamps, and another of US Postal Service stamps. But looking up the various postage rates, with their grams and ounces, was a nuisance. I couldn’t find a single rate card which covered both countries succinctly. And with each service raising its prices about once a year, my improvised rate cards were going out of date every few months.
Nearly two years ago I came up with a handy quick reference to current Canada Post and USPS postage rates for basic letters between the USA and Canada. Last spring it was polished enough that I posted it on my web site. I just now updated it to reflect the Canada Post rate increase which took effect on 17. January. You can find it at http://jdlh.com/en/pr/postage_card.html.