Miter Angle Calculator
Professional miter angle calculator for precise woodworking cuts. Calculate miter angles for frames, crown molding, and complex joints with real-time results and cutting guides.
⚠️ CUTTING SAFETY NOTICE
Always wear appropriate safety equipment when cutting. Double-check angle calculations before cutting expensive materials. Test cuts on scrap wood first. Ensure proper saw setup and blade alignment for accurate results.
Angle Parameters
Project Type
Frame Settings
Angle Results
Select project type and parameters to calculate precise miter angles for your woodworking project.
Picture Frame Miters
For standard rectangular frames, each corner requires a 45° miter cut. Octagonal frames need 22.5° cuts for perfect joints.
Crown Molding
Crown molding requires compound miter cuts. Spring angle and wall angle determine the precise miter and bevel settings.
Polygon Calculations
For any regular polygon, the miter angle equals (180° - interior angle) ÷ 2. Interior angle = (n-2) × 180° ÷ n.
Compound Cuts
Compound cuts combine miter and bevel angles. Essential for complex joints and angled assemblies in furniture making.
Precision Measuring
Use digital angle finders and precision squares to verify calculated angles. Test cuts on scrap material first.
Saw Setup
Proper miter saw calibration is crucial. Check blade alignment, fence square, and miter gauge accuracy regularly.
Frequently Asked Questions
For rectangular frames, use 45° miter cuts at each corner. For other polygons, divide 180° by the number of sides to get the miter angle. For example, an octagon requires 22.5° cuts (180° ÷ 8 = 22.5°).
A miter cut is angled across the width of the board (horizontal plane), while a bevel cut is angled through the thickness (vertical plane). Compound cuts combine both miter and bevel angles.
Crown molding requires compound miter cuts. The spring angle (typically 38° or 45°) and wall angle determine the miter and bevel settings. Use our crown molding calculator for precise angles based on your specific molding profile.
Common causes include: inaccurate angle calculations, saw blade not perpendicular to the table, fence not square, or material movement during cutting. Always test cuts on scrap wood and verify saw calibration.
Essential tools include: miter saw or miter box, digital angle finder, combination square, precision ruler, and sharp blade. For crown molding, consider a compound miter saw with positive stops.
For professional results, aim for accuracy within 0.1°. Small errors compound across multiple joints. Use digital tools when possible and always verify calculations with test cuts on scrap material.