calculator california canadian company custom domestic estimate fees guessing international john merchants ottawa ounce primarily rate reasonably ship shipping states support toronto usps values vancouver york

I am a Canadian Company in Ottawa, ON. I ship to Vancouver, BC as well as Toronto, ON and St. John's NF. This we will also be shipping to the states, primarily California and New York. I don't want to keep guessing about my shipping fees. Do you have anything that would reasonably estimate the shipping fees?

We only support USPS shipping calculator currently, which works for U.S. merchants or you can enter a custom per ounce rate, but that can only take 2 values - domestic and international.