What is Miter Cut?
A miter cut is an angled cut made across the face of a board with the blade remaining vertical, commonly used for picture frames, crown molding, and trim joints.
A miter cut is an angled cut across the face (width) of a board, with the blade staying vertical. The most common angle is 45 degrees, which allows two pieces to join and form a clean 90-degree corner.
The angle formula. Divide the desired corner angle by 2. A 90-degree corner needs two 45-degree miters. An octagonal frame needs 22.5-degree miters. A hexagonal shape uses 30-degree cuts.
Miter vs. bevel vs. compound. A miter angles across the face while the blade stays vertical. A bevel tilts the blade to angle through the edge. A compound miter combines both, which is how crown molding is typically cut.
Tools. The miter saw (also called a chop saw) is the primary tool. You can also cut miters on a table saw with a miter gauge. For precise picture frames, a dedicated miter trimmer gives the cleanest results.
Joint strength. Miter joints look clean because no end grain is visible, but they are not the strongest. End grain glues poorly, so reinforcement with splines, biscuits, or pin nails is common for structural joints.
In the cut list workflow, miter cuts affect part length. Measure to the long point or short point of the miter and note which in your list to avoid confusion at the saw. SmartCutList includes miter-cut parts in your cut list so you can track dimensions, angles, and material needs in one place.
Frequently Asked Questions
- What angle is a standard miter cut?
- A standard miter cut is 45 degrees, used to join two pieces at a 90-degree corner. Picture frames, door trim, and baseboard corners all use 45-degree miters. For other angles, divide the desired corner angle by 2 to get the miter setting.
- What is the difference between a miter cut and a bevel cut?
- A miter cut angles across the face of a board (the blade stays vertical, the fence angle changes). A bevel cut angles through the thickness (the blade tilts while the fence stays at 90 degrees). A compound miter combines both angles at once.
- How do you get tight miter joints?
- Use a sharp, fine-tooth blade (60-80 teeth) and cut slightly long, then sneak up on the final fit with micro-adjustments. Check both pieces against a square before gluing. Apply glue to both faces, use painter's tape as a clamp for small joints, and check for square while the glue sets.
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