30 60 90 Triangle Calculator
Find all sides and the area of a 30-60-90 special right triangle from its short leg.
- Long leg (opposite 60°)
- 8.6603
- Area
- 21.6506
Formula: sides = a : a√3 : 2a
About 30 60 90 Triangle Calculator
30 60 90 Triangle Calculator is a free online calculator that gives you an instant, accurate result as you type. Find all sides and the area of a 30-60-90 special right triangle from its short leg.
The calculation uses the standard formula sides = a : a√3 : 2a and updates live with every change to the inputs. Everything runs client-side in your browser — fast, private, and free to use as often as you like.
In a 30-60-90 triangle the sides are always in the fixed ratio 1 : √3 : 2, so one side determines the whole triangle.
Frequently Asked Questions
Is 30 60 90 Triangle Calculator free to use?
Yes. 30 60 90 Triangle Calculator is completely free, with no sign-up, no downloads, and no usage limits. You can use it as many times as you like on any device with a web browser.
How accurate is this calculator?
The calculator applies the standard formula (sides = a : a√3 : 2a) with full floating-point precision and rounds only the displayed result. For most practical purposes the results are exact.
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