Figuring a 45 degree angle is a foundational skill that shows up everywhere from weekend woodworking projects to professional construction sites. Whether you are cutting picture frame molding, laying out a stair stringer, or setting a miter saw for a perfect corner joint, knowing how to find and mark a 45 degree angle accurately can mean the difference between a tight, professional fit and a visible gap. This guide walks you through the most reliable methods for figuring a 45 degree angle, explains the geometry that makes it work, and helps you avoid common mistakes that throw off even experienced builders.
What Is a 45 Degree Angle?
A
