Crown molding angles that fit any corner
Enter your corner angle and the molding spring angle. Get the exact miter and bevel to set on the saw, with a diagram showing how to lay the molding down. Built for odd corners, not just a square 90. Free, in your browser.
Where the paid apps fall down
Any corner, not just 90
Bay windows, stair walls, and vaulted ceilings are rarely square. Measure the real angle and the calculator returns the right miter and bevel for it.
Open the calculator 02Every spring angle
38, 45, and 52 degree crown each need different settings. Pick yours and the math adjusts, so the joint closes instead of gapping.
About spring angles 03A diagram that shows you
Which edge is up, which way the table turns, inside versus outside. The orientation is half the battle, so we draw it for every result.
Inside vs outsideWhy a tool, when a chart could do it?
A printed angle chart gives you one row: a 90 degree corner with one spring angle. The moment your wall reads 92, or you are wrapping an outside corner on a vaulted ceiling, the chart is no help and the usual guess of 45 degrees leaves a visible gap. Crown is a compound cut, and the right answer changes continuously with the corner and the spring angle.
CrownMiter does the trigonometry for whatever you measure. It takes the corner angle and the spring angle, applies the standard compound-miter relations, and returns the exact miter and bevel, then draws how the molding sits on the saw. The numbers match the settings every reference and saw detent gives for the common cases, so you can trust them on the odd ones.
A square 90 degree corner with 38 degree spring crown takes a 31.6 degree miter and a 33.9 degree bevel. Widen the corner to 135 degrees, as in a bay window, and the same molding wants a 59.6 degree miter and a 15.7 degree bevel. One chart row cannot tell you that; the math can.
Method: standard flat-on-saw compound miter. References on the calculator page.Learn the cut, not just the number
How to cut crown molding for odd corners
Most rooms are not square. A corner that should be 90 degrees often reads 88 or 93, and bay windows, stair walls, and vaulted c...
Read the guide 02Crown molding spring angle explained
The spring angle is the angle the back of the molding makes with the wall once it is up. It is the number that decides how the...
Read the guide 03Crown molding inside vs outside corners
An inside corner wraps into the room; an outside corner wraps around a column or a chimney breast. For a square corner the mite...
Read the guide 04How to cut crown molding flat on the saw
There are two ways to cut crown: nested against the fence at its spring angle, or laid flat on the table with a compound miter...
Read the guideFrequently asked questions
What is a crown molding angle calculator?
It is a tool that turns the angle of your corner and the spring angle of your molding into the two saw settings you need: the miter (table rotation) and the bevel (blade tilt) for cutting the molding flat. It saves the trigonometry and, unlike a fixed chart, it works on corners that are not exactly 90 degrees.
Is it really free?
Yes. The calculator runs entirely in your browser, needs no sign-up, and the printable cut sheet is free to download. There is nothing to install and nothing to pay.
Does it handle odd or out-of-square corners?
Yes, that is the whole point. Measure the real angle between your two walls and enter it. The calculator recomputes the miter and bevel for any corner, which is what bay windows, stair walls, and vaulted ceilings need and what fixed-angle apps get wrong.
Are the numbers correct?
Yes. The formulas reproduce the published settings every reference and saw detent gives: 38 degree spring on a 90 degree corner returns 31.6 miter and 33.9 bevel. The math is checked against cited woodworking sources before anything ships.