One of the most useful and time-tested tricks in carpentry is the 3-4-5 rule, also known as the Pythagorean Theorem trick. This simple method helps you create a perfect 90-degree angle without needing fancy tools like a framing square or laser level. It’s a game-changer for building square walls, decks, frames, and stair stringers.
How It Works:
- Measure 3 units along one side (e.g., inches, feet, or any consistent unit).
- Measure 4 units along the perpendicular side from the same starting point.
- Measure diagonally between those two points—if it measures exactly 5 units, you have a perfect right angle!
Why It’s So Useful:
- Works at any scale (small furniture to large buildings)
- No need for specialized tools—just a tape measure and a pencil
- Ensures accuracy when squaring frames, laying out foundations, or installing cabinets
Next time you’re framing a wall, setting up a deck, or aligning a workpiece, use the 3-4-5 trick for spot-on precision. It’s an old-school technique that pros rely on every day! 🔨📏
