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Reference table

Diagonal of Rectangle Table: Diagonal by Length

Reference table of diagonal for Diagonal of Rectangle across a range of length values — exact, engine-computed figures you can read off at a glance.

By Vikram Iyer, M.Sc Mathematics · Updated Jun 2026 · 1 min read

This diagonal of rectangle reference table shows the diagonal for a range of length values, assuming a width of 4. Every figure is computed with the same engine that powers our Diagonal of Rectangle Calculator, so the numbers are exact.

LengthDiagonal
0.754.0697
1.54.2720
2.34.6141
35.0000
4.56.0208
67.2111
99.8489
1515.5242
2121.3776
3030.2655

How to use this table

Find the row closest to your 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 Rectangle Calculator for a precise answer.

Need a value that is not in the table? — the Diagonal of Rectangle Calculator does it instantly, for free, with the formula and a worked example built in.

Continue exploring math calculators with these tools: Margin of Error Calculator, Sample Size Calculator, Confidence Interval Calculator, Coefficient of Variation Calculator, Regular Heptagon Area Calculator.

Calculators in this guide

Frequently asked questions

Each cell is computed with the standard formula using exact arithmetic — the same calculation behind our Diagonal of Rectangle Calculator — so every figure is accurate for the stated assumptions.

Yes. The table covers common length values; for any exact figure, enter your own numbers in the Diagonal of Rectangle Calculator.

Vikram Iyer · M.Sc Mathematics

Vikram Iyer is a mathematics educator with over fifteen years of teaching experience, specialising in making quantitative concepts clear and practical for everyday use.