Carpentry lives and dies on angles that refuse to stay in one plane. A crown molding corner is not just a 45-degree miter; the molding also tilts against the wall, so the saw blade must swing on two axes at once. Get either angle wrong and the joint gapes open. This calculator takes your two input values and evaluates the combined result, sparing you the trigonometry.

Type your first angle into the Variable A field and your second into Variable B -- for a standard 90-degree inside corner with 38-degree spring-angle crown molding, those are the classic starting points. The Result field returns the evaluated combination, which you can then dial into your miter saw and bevel settings. Woodworkers cutting picture frames, stair handrails, and hip roofs use the same two-variable approach whenever a joint bends in two directions.

The math underneath handles any pair of values, not just woodworking angles, so the tool doubles as a general two-variable evaluator. But its heart belongs to the shop: measure twice in degrees, cut once in inches, and the molding meets cleanly at the corner instead of leaving a wedge-shaped gap your caulk tube cannot hide.

With the pre-filled defaults — Variable A 10, Variable B 5 — the Compound Angle Calculator returns Result 50.0000. Change any input and those results update instantly, so you can see exactly how each number you enter moves the answer.