Equilateral Triangle Calculator
Find the area, height and perimeter of an equilateral triangle from the length of its side. Enter side length to see area, height and perimeter when…
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Find the area, height and perimeter of an equilateral triangle from the length of its side. Enter side length to see area, height and perimeter when you calculate.
Worked example
Example calculated from the starting values. Enter your own values and press Calculate to get your result.
With the default inputs (side length = 6), the results are: area 15.588; height 5.196; perimeter 18.000.
Quick reference: side length vs result
Reference table based on the example values; it is not your calculation result.
| Side length | Area | Height | Perimeter |
|---|---|---|---|
| 3 | 3.897 | 2.598 | 9.000 |
| 6 | 15.588 | 5.196 | 18.000 |
| 12 | 62.354 | 10.392 | 36.000 |
| 30 | 389.711 | 25.981 | 90.000 |
| 60 | 1,558.846 | 51.962 | 180.000 |
| 120 | 6,235.383 | 103.923 | 360.000 |
Frequently asked questions
What formula does this calculator use?
Area = sqrt(3) ÷ 4 × s^2; Height = sqrt(3) ÷ 2 × s; Perimeter = 3 × s. Variables: s = side length.
What do I need to enter?
You need side length. Results update as you type.
What is an example result?
With the default inputs (side length = 6), the results are: area 15.588; height 5.196; perimeter 18.000.
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