Work out space diagonal instantly with clear inputs, formula shown and shareable results.
The space diagonal of a rectangular box is the three-dimensional Pythagorean result √(l² + w² + h²) — the longest straight line that fits inside the box.
Space diagonal
d = √(l² + w² + h²)
√(36 + 16 + 9) = √61 ≈ 7.810250 units.
A rigid rod fits inside a box only if it is no longer than the space diagonal.