Geometry & Measurement Calculators
Equilateral Triangle Calculator
Find height, area, perimeter and radii of an equilateral triangle from one side.
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What is Equilateral?
An equilateral triangle has three equal sides and three 60° angles, so a single side length determines every other property.
How it works
We apply the closed-form ratios for a 60-60-60 triangle, including the inradius and circumradius scales.
- Enter your input. Type or paste your input into the field above — the tool responds instantly.
- Review the result. Output updates live as you type. Everything runs entirely in your browser.
- Copy or download. Use the Copy button to grab the result, or Download to save it as a file.
Examples
Realistic sample
Type or paste any realistic input — the tool computes the result locally and instantly.
Common mistakes
Expecting a server round-trip
Nothing is uploaded — every tool in this category runs entirely in your browser.