Cut with the piece standing flat against the miter saw fence.
Cut flooring trim at angles.
Measure along the wall and floor junction from the first corner to the first cut point.
The video above provides a great cheat sheet that makes it even easier for you to identify exactly what angle you need to cut.
The first step in cutting trim is going to be identifying the angle you need to cut.
You will need a miter saw to cut the trim at an angle and form a corner.
Learn how to quickly cut a 45 degree angle cut with a circular saw on a quarter round or molding.
Cut the 45 degree angle on both sides from the short to short direction.
Cutting the trim for a door is another great way to practice with your miter cutting skills.
Slice a trim board at a 45 degree angle.
Just an fiy take on the same principal that chris uses there s a youtube video that shows a master carpenter who basically threw out his angle finder crown molding protractor in lieu of a roll of paper drywall joint tape to figure out angles a link is easy to find by typing how to measure for crown molding without tools but basically the idea is cut 2 strips of joint tape.
The most popular angles for interior trim are 90 and 135 degrees and each of those angles can be straight on or with a bullnose.
Measure across top of door and on the inside and add 3 8 inch to the measurement.
Record this measurement with an additional note detailing if the left and right sides of the trim are.
If you need to measure a mitered angle that s other than 90 degrees you could hunt around for your protractor but there s a better way.