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Equilateral Triangle Calculator
Area, perimeter, height and circle radii of an equilateral triangle from its side.
ruler Free Online Tool
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Area
Compare Your Options And Get Clear Answers
Area, perimeter, height and circle radii of an equilateral triangle from its side.
Equilateral Triangle Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Area = (sqrt 3 / 4) s^2.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Equilateral Quick Guide
Typical values for reference.
| Side | Area | ||
|---|---|---|---|
| 6 | 15.588 | undefined | undefined |
| 1 | 0.433 | undefined | undefined |
| 10 | 43.301 | undefined | undefined |
| 2.5 | 2.706 | undefined | undefined |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Equilateral Triangle Calculator FAQ
Answers to common questions about this calculator.
One with three equal sides and 60 degree angles.
Root 3 over 4 times side squared.
Side times root 3 over 2.
Yes.