Gate Brace Calculator
Enter the gate width and height to get the diagonal brace length.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
A rectangular gate frame racks (sags out of square) under its own weight unless a diagonal brace ties opposite corners together. That brace length is simple geometry — the Pythagorean theorem, brace = √(width² + height²) — since the brace, width, and height form a right triangle across the frame.
Carpenters, fence installers, and DIY builders use this to cut a diagonal 2x4 or steel tube to the exact length before installing it corner-to-corner, which is what keeps a wooden or metal gate hanging square for years instead of drooping on its hinges.
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