I've never been great at math, but so far, I'm not having issues with calculating yardage. One time, though, I was trying to calculate yardage, and while my math was right, my initial numbers were wrong and my calcs ended up being a total of like 31 yards JUST for the top! I was so confused...lol I knew it couldn't possibly be right, but I also knew my math WAS right...once I rethought it, I realized my initial error and got it sorted out. I could never in a million years explain how I get my answers, but I know they're right. lol