Here is a list of angles that can be easily formed with a straight board across a carpenter’s square. For the desired angle, set the board at the length and height marks listed and clamp into place. All the angles shown in the table are accurate within ¼ of a degree. For angles larger than 45°, just exchange the height and length. For example, a 30° angle would be formed when setting your board at 19" long and 11" high, so 60° would be measured at 11" long and 19" high.
