The basic rule of thumb is that if a bear stands 36 inches at the shoulders, his hide will square right around 6 feet. What’s nice about the limbo pole is you don’t have to worry about various angles of viewing as you do with a mark on a tree, or a barrel. When a bear walks under the pole, if its back doesn’t touch, it’s a small bear. If its back does touch the pole, it’s right around 6 feet. If the bear really has to hunch to get under the pole, it’s definitely a shooter.