This diagonal of square reference table shows the diagonal for a range of side length values. Every figure is computed with the same engine that powers our Diagonal of Square Calculator, so the numbers are exact.
| Side length | Diagonal |
|---|---|
| 1.3 | 1.838478 |
| 2.5 | 3.535534 |
| 3.8 | 5.374012 |
| 5 | 7.071068 |
| 7.5 | 10.606602 |
| 10 | 14.142136 |
| 15 | 21.213203 |
| 25 | 35.355339 |
| 35 | 49.497475 |
| 50 | 70.710678 |
How to use this table
Find the row closest to your side length and read across to the diagonal. For a value between two rows, the real figure sits between them — or enter your exact numbers in the Diagonal of Square Calculator for a precise answer.
Need a value that is not in the table? — the Diagonal of Square Calculator does it instantly, for free, with the formula and a worked example built in.
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