Printable 3-4-5 Corner Squaring Guide
This one-page Letter PDF is for anyone checking or setting a square corner on a layout. It shows the 3-4-5 method in a simple table with columns for Multiple, Side a, Side b, and Diagonal. The rows include examples such as 1 ft, 3 ft, 4 ft, 5 ft; 2 ft, 6 ft, 8 ft, 10 ft; and 3 ft, 9 ft, 12 ft, 15 ft. A note at the bottom explains that if the diagonal is longer, the corner is open; if it is shorter, the corner is closed.
Free printable · PDF
- 1 page
- US Letter — choose “Fit to page” for A4
- PDF, 58 KB
Free for personal, family and classroom use.
Print it and keep it with your angle finder or layout tools. Match the side lengths to the table, then compare your measured diagonal to the example. Use the longer-or-shorter note to judge the corner before you fasten, mark, or cut anything.
Good for
- Square a corner during framing
- Check layout before cutting
- Compare measured diagonals on site
Tip: Print at actual size and keep the sheet flat so the table stays easy to read.
4 files · PDF, XLSX
Get every sheet: Angle and Layout Reference
This sheet plus 3 more in one download, with the editable Excel files. Printable DIY angle kit: a printable protractor and angle templates, a mitre angle chart for polygons, a slope and grade conversion chart and a 3-4-5 squaring guide.
$3.00 USD, one-time 4 files · about $0.75 each
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