Equilateral Triangle Table: Area by Side length
Reference table of area for Equilateral Triangle across a range of side length values — exact, engine-computed figures you can read off at a glance.
Equilateral Triangle Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
Area
15.5885
- Height
- 5.1962
- Perimeter
- 18.00
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the Equilateral Triangle Calculator
The Equilateral Triangle Calculator works out your area, along with 2 related figures in an instant. Enter side length and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.
- Enter the side length.
- Read off your area, together with height and perimeter — the calculator updates automatically, with no button to press.
Formula
The Equilateral Triangle Calculator uses the formula:
Area = √(3) ÷ 4 × Side length ^ 2
Worked example
For example, with side length of 6 units, the area is 15.5885.
| Side length | 6 units |
|---|
| Area | 15.5885 |
|---|---|
| Height | 5.1962 |
| Perimeter | 18.00 |
Results are estimates for educational use, not professional advice.
Key terms explained
- Perimeter
- The total distance around the outside of a two-dimensional shape.
- Area
- The amount of two-dimensional space a shape covers, measured in square units.
Frequently asked questions
Use A = √3 ⁄ 4 × side². A side of 6 gives an area of about 15.59 square units.
The height is √3 ⁄ 2 × side. For a side of 6 it is about 5.20 units.
All three sides are equal and all three angles are 60 degrees.
Since all sides are equal, the perimeter is simply three times the side length.
The Equilateral Triangle Calculator uses the formula: Area = √(3) ÷ 4 × Side length ^ 2. For example, with side length of 6 units, the area is 15.5885.
Enter the side length. Read off your area, together with height and perimeter — the calculator updates automatically, with no button to press.
Related guides
How to Calculate Equilateral Triangle: Formula, Steps & Examples
Learn how to calculate Equilateral Triangle — the formula explained step by step, with worked examples and a free calculator to check your answer.