Crown Molding Calculator
Professional crown molding calculator for precise trim installation. Calculate miter angles, material requirements, cutting lists, and installation measurements for perfect crown molding projects.
⚠️ INSTALLATION SAFETY NOTICE
Always use proper safety equipment when cutting and installing crown molding. Verify measurements twice before cutting. Use appropriate ladder safety when working at height. Secure all power tools properly.
Room & Molding Specifications
Room Configuration
Room Dimensions
Crown Molding Specifications
Installation Parameters
Installation Analysis
Enter room dimensions and crown molding specifications to calculate material requirements, cutting angles, and installation measurements for your project.
Miter Angles
Precise miter and bevel angles for perfect crown molding joints. Accounts for spring angle and corner geometry.
Material Requirements
Calculate exact linear footage needed including waste allowance and standard length optimization.
Cutting List
Detailed cutting list with piece lengths and angles for efficient material usage and installation.
Installation Guide
Step-by-step installation guidance with proper techniques for professional-quality results.
Corner Analysis
Analyze different corner types and room configurations for accurate angle calculations.
Cost Estimation
Accurate material cost calculations including waste factors and installation considerations.
Frequently Asked Questions
Spring angle is the angle at which crown molding sits against the wall and ceiling. Most crown molding has a 38° or 45° spring angle. This angle determines the miter and bevel angles needed for proper corner joints.
Crown molding is measured by its width (wall contact) and height (ceiling contact). The actual face width is larger. Always measure the flat surfaces that contact the wall and ceiling, not the decorative face.
For 90° corners with 38° spring angle: Inside corners use 31.6° miter and 33.9° bevel. Outside corners use 31.6° miter and 33.9° bevel but with opposite orientations. Always test cut on scrap material first.
Order 10-15% extra material for waste, mistakes, and future repairs. Complex rooms with many corners may need 20% extra. It's better to have too much than to run short and not match the profile later.
Yes, but it requires careful scribing and possibly flexible molding. Small irregularities can be handled with caulk. Large variations may require shimming or using flexible crown molding designed for uneven surfaces.
Essential tools include: compound miter saw, nail gun or hammer, level, measuring tape, pencil, safety glasses, and ladder. A crown molding jig for your miter saw makes cutting much easier and more accurate.