The most complete free crown molding calculator app online. Calculate miter angles, bevel cuts, spring angles, projection, height, linear footage, and total project cost — with a visual cut diagram and room-by-room breakdown. Works for any crown molding profile and any corner angle.
Enter your room dimensions, molding profile, and corner angles — get cut angles, footage, projection, and cost
From first cut to final cost, this free crown molding calculator app covers every angle, every measurement, and every budget line.
Computes the exact compound miter angle (saw tilt) and bevel angle (fence rotation) for your specific spring angle and corner angle. Works for 90° corners and any non-square corner from 1° to 179°.
Pre-loaded presets for the three most common spring angles — 38°, 45°, and 52° — plus a fully custom input for any spring angle. The spring angle determines all compound cut calculations.
Calculates the horizontal projection (how far the molding extends from the wall) and vertical rise (how far it drops from the ceiling) from your molding width and spring angle. Essential for planning.
Determines the installed height of crown molding on the wall from the spring angle and molding width, helping you plan backing, picture rail placement, and paint line height accurately.
A clear visual cut diagram shows exactly how to orient the molding on your saw, with written instructions for left and right miters for both inside and outside corners — never cut the wrong direction again.
Enter room length, width, and ceiling height to get the full linear footage needed, pieces required, and a plan-view diagram showing the room layout with molding positions highlighted.
Calculate total project cost including molding material, labour, supplies, and tax. Toggle each cost item on or off for material-only or fully installed estimates.
Converts linear footage to the number of full-length sticks to purchase, accounting for offcuts and waste. Choose from 8 ft, 12 ft, 16 ft, or 20 ft stock lengths available from your lumber yard.
Select 5%, 10%, 15%, or 20% waste allowance to account for offcuts, mis-cuts, and corner fitting. Always add waste — crown molding offcuts cannot be reused for most cuts.
Out-of-square walls are extremely common in older homes. Enter any custom corner angle and the calculator instantly adjusts all miter and bevel angles for a perfect fit.
Copy a text summary of all angles, footage, and cost to your clipboard for sharing with tradespeople. Print the full calculation as a PDF reference to take to the job site.
This free crown molding calculator app works entirely in your browser. No account, no subscription, no data collection. Use it for residential, commercial, or professional estimating without limits.
Miter angles, spring angles, bevel cuts, projection, height, footage, and cost — everything you need to know about crown molding calculators
A crown molding calculator is a tool that takes the guesswork and the trigonometry out of one of carpentry's most notoriously tricky tasks. Crown molding runs at an angle between the wall and the ceiling — that spring angle means every cut is a compound cut, involving both a miter angle (the rotation of the blade on the horizontal plane) and a bevel angle (the tilt of the blade on the vertical plane). Getting these two angles right is the difference between tight, invisible joints and visible gaps that require excessive caulk to disguise.
Before digital tools became widely available, carpenters calculated these angles by hand using trigonometry formulas, or they relied on experience and trial-and-error with test pieces. The crown molding angle calculator does that calculation instantly and accurately for any spring angle, any corner angle, and any molding profile. Whether you are a professional trim carpenter or a determined DIY homeowner tackling your first ceiling installation, using a calculator eliminates the most common source of wasted material and frustration.
Beyond the angle calculations, a complete crown molding calculator app also handles the project planning side — calculating total linear footage, the number of stock pieces to purchase, projection and rise measurements, and total installed cost. This makes it equally valuable as a crown molding cost calculator for budgeting and quoting.
The spring angle is the angle at which crown molding tilts away from vertical when it is installed. It is the single most important measurement for any crown molding miter calculator, because all the compound cut angles derive directly from it. When crown molding sits flat against a wall in its installed position, it forms a triangle between the wall, the ceiling, and the back face of the molding. The spring angle is the angle between the back face of the molding and the wall.
The two most common spring angles are 38° and 45°. A 38° spring angle is most common on mass-produced flat-back crown molding — the type you find at every big-box lumber yard. A 45° spring angle means the molding forms equal legs against the wall and ceiling, and this type is common on more ornate profiles. Some steep architectural crown molding profiles use a 52° spring angle. If you are not sure of your molding's spring angle, hold it against the corner where a wall meets the ceiling and measure the angle between the back of the molding and the wall with a digital angle gauge — or simply check the manufacturer's product specification.
Why does this matter so much? Because changing the spring angle changes every single miter and bevel angle. A 38° spring molding at a 90° inside corner requires a miter angle of 31.62° and a bevel of 33.86°. A 45° spring molding at the same 90° corner requires a miter of 35.26° and a bevel of 30°. Using the wrong spring angle setting on your saw will guarantee a poor-fitting joint, even if you cut precisely.
The crown molding angle calculator outputs two distinct angles, and understanding the difference between them is critical for setting up your miter saw correctly.
The miter angle is the horizontal rotation of the saw blade — the angle you set by rotating the saw's table or the fence. On a standard miter saw, this is the angle indicated on the scale at the base. A miter cut at 0° produces a perfectly square cut straight across the face of the molding. A miter of 45° produces a diagonal cut across the face. The miter angle for crown molding is always less than 45° for 90° corners when using the compound cut method (molding flat on the saw table).
The bevel angle is the tilt of the saw blade off vertical — the angle you set by tilting the blade left or right. On a compound miter saw, this is a second adjustment independent of the miter angle. Together, the miter and bevel angles produce a compound cut whose geometry replicates what would happen if you held the molding at its spring angle against the wall and made a 45° miter cut through it. The key insight is that lying the molding flat on the saw table and using a compound cut produces the same result as holding it at its spring angle — and it is much safer and more accurate to cut flat.
There are two main ways to cut crown molding on a miter saw. The nested method positions the molding at its spring angle against both the fence and the table of the saw, so the back faces rest against the fence and table just as they would rest against the wall and ceiling. In this position, a simple miter cut (no bevel) produces the correct angle. The disadvantage is that the molding can be difficult to hold steady, especially for long pieces, and the saw must have a fence tall enough to support the molding's height. The compound cut method lays the molding flat on the saw table, uses both a miter angle and a bevel angle, and is generally considered more accurate and repeatable. Our crown molding cut calculator outputs compound cut angles for the flat-on-table method.
The crown molding projection calculator outputs two key measurements that are often overlooked until the molding is already on the wall: the horizontal projection and the vertical rise.
The horizontal projection is how far the crown molding extends horizontally from the wall into the room. For a 3.5-inch wide crown with a 38° spring angle, the projection is approximately 2.76 inches. This matters for several reasons: it affects how much of the ceiling is covered and can interfere with light fixtures, curtain rods, ceiling fans, or other elements positioned close to the wall.
The vertical rise (also called the crown height on the wall) is how far the molding drops down the wall from the ceiling line. This determines where the bottom edge of the crown molding will sit — critical information for painting the wall below, positioning picture rails, and planning wainscoting or chair rail installations that need to be proportionally spaced below the crown. The crown molding height calculator computes this as: rise = molding width × sin(spring angle).
A crown molding cost calculator takes the guesswork out of project budgeting. The total cost of a crown molding installation has several components that all need to be accounted for accurately.
| Cost Component | Typical DIY Range | Typical Installed Range |
|---|---|---|
| Molding Material | $1.50–$8/linear ft | $1.50–$8/linear ft |
| Labour | — | $4–$12/linear ft |
| Supplies | $25–$60 flat | Included in labour |
| Painting | $0.75–$2/linear ft | $1–$3/linear ft |
| Total (12×14 room) | $150–$400 | $400–$900+ |
Crown molding material prices vary enormously by profile type, material, and width. Basic finger-jointed MDF or pine crown (suitable for painting) costs $1.50–$3.00 per linear foot for a standard 3.5-inch profile. Solid wood crown in poplar or oak runs $3–$6 per linear foot. Ornate multi-piece assemblies, architectural crown, or specialty profiles in wider widths can cost $6–$15 or more per linear foot. Polyurethane foam crown molding — a lightweight option that requires no cutting skill for joints — is typically $2–$5 per linear foot but has limitations in high-humidity spaces.
Professional crown molding installation labour ranges from $4 to $12 per linear foot depending on the region, the complexity of the room (number of corners, ceiling height, non-square walls), and the width of the profile. Wider and more ornate profiles take more time to cut and fit. Rooms with cathedral or vaulted ceilings, bay windows, or complex architectural details take significantly longer. When using the free crown molding calculator for a professional project quote, always get at least two labour quotes from local trim carpenters and add the material cost separately for accuracy.