Crown Molding Miter Calculator
Miter and bevel angles for crown molding corners.
Enter your values
Choose one of: 90° (standard corner), 135° (bay window), 45° (octagon bay).
Choose one of: 38° (most common), 45°.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Miter saw angle
- 31.6°
- Bevel saw angle
- 33.9°
- Corner angle used
- 90°
- Spring angle used
- 38°
Quick answer
Compound miter angles for crown molding depend on the wall corner angle and the molding's spring angle off the wall.
derived from spring angle using standard crown molding miter/bevel tables
At a glance
| What it does | Miter and bevel angles for crown molding corners. |
|---|---|
| Category | Home & DIY |
| Inputs needed | Corner angle, Spring angle |
| Main output | Miter saw angle |
| Formula | derived from spring angle using standard crown molding miter/bevel tables |
| Cost | Free — no sign-up, no download |
How to use the Crown Molding Miter Calculator
- 1Identify the wall corner angle — 90° for a standard inside or outside corner.
- 2Check the spring angle stamped or measured on your crown profile, usually 38° or 45°.
- 3Set your compound miter saw to the miter and bevel angles shown and always test-cut scrap first.
Inputs explained
- Corner angle
- Choose one of: 90° (standard corner), 135° (bay window), 45° (octagon bay).
- Spring angle
- Choose one of: 38° (most common), 45°.
Worked example
Using the values the calculator loads with:
Inputs
- Corner angle90° (standard corner)
- Spring angle38° (most common)
Results
- Miter saw angle31.6°
- Bevel saw angle33.9°
- Corner angle used90°
- Spring angle used38°
Frequently asked questions
Why does spring angle matter?
Crown sits at an angle off the wall and ceiling, so the cut angles differ from flat trim.
Can I cut crown flat on the saw table instead?
Yes, using a crown-stop jig and different, saw-specific angles, but the compound method shown works on any miter saw.
What do I need to enter into the Crown Molding Miter Calculator?
Just 2 values: corner angle, spring angle. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Crown Molding Miter Calculator work out the answer?
Compound miter angles for crown molding depend on the wall corner angle and the molding's spring angle off the wall. It applies the formula derived from spring angle using standard crown molding miter/bevel tables and shows the working so you can check each step by hand.
Is the Crown Molding Miter Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.