Crown Molding & Trim Calculator

Trim Type

Room Dimensions

Wall 1 Length (feet)

Wall 2 Length (feet)

Wall 3 Length (feet)

Wall 4 Length (feet)

Openings & Details

Number of Doors

3 ft deducted per door

Number of Windows

4 ft deducted per window

Number of Corners

Inside/outside corners

Waste Factor

Materials Needed

0

Linear Feet Needed

(with waste)

0

8-foot Pieces

0

12-foot Pieces

0

Base Perimeter (ft)

0

Deductions (ft)

0

Waste (ft)

$0

Est. Cost ($2/ft)

Miter Cut Summary

Inside corners: 0 miters

Outside corners: 0 miters

Total cuts needed: 0

Scarf joints: 0

💡 Pro Tip

Buy molding in the longest lengths possible to minimize joints. Use scarf joints (45° angles) to join pieces on long walls.

How to Use

Select the type of trim you're installing
Measure each wall length in your room
Count doors, windows, and corners
Choose appropriate waste factor (10% standard, 15-20% for complex rooms)
Click "Calculate Trim Needed" to see material requirements

Trim Installation Guide

Trim Types

Crown molding: ceiling/wall junction. Baseboard: floor/wall junction. Chair rail: 32-36" high on walls. Casing: around doors and windows (3 sides per opening).

Miter Cuts

Inside corners: 45° miter cuts on both pieces. Outside corners: 45° miter cuts outward. Crown molding requires compound miter cuts - use spring angle guide.

Scarf Joints

For long walls, join pieces with 45° scarf joints (overlapping angled cuts). More attractive than butt joints. Secure both pieces to studs for strength.

Installation Tips

Find studs and nail into them. Use brad nailer for clean finish. Fill nail holes with wood filler. Caulk gaps between trim and wall. Paint or stain before or after installation.

📏 Crown Molding & Trim Calculator