Use our 30 60 90 Triangle Calculator to quickly find the unknown side lengths of this special right triangle. Simply input one known side – the short leg, long leg, or hypotenuse – and instantly get the other two values based on the fundamental 30-60-90 triangle rules.
Formula:
For a 30-60-90 triangle, if s is the short leg (opposite 30°), l is the long leg (opposite 60°), and h is the hypotenuse (opposite 90°):
- Long Leg (l) = s × √3
- Hypotenuse (h) = 2 × s
- Short Leg (s) = h / 2 = l / √3