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Equilateral Triangle Calculator

Find area, height and perimeter when all three sides have equal length and every angle is 60 degrees.

Enter your values

Enter a numeric value. Must be greater than zero.

Use a decimal point, without thousands separators.

Example result
Area
15.58845727
Height5.19615242
Perimeter18

The initial result uses the example values. Enter your own values and calculate again.

Edit inputs

How it works

Find area, height and perimeter when all three sides have equal length and every angle is 60 degrees.

Inputs and units
Equilateral Triangle Calculator · Inputs and units
InputExample valueWhat to enter
Side6Enter a numeric value. Must be greater than zero.
A = √3 a²/4; h = √3 a/2; P = 3a

Worked example

Show example inputs and results

This example is generated by the same calculation engine using the starting values in the form. Your own inputs produce your own result.

Side
6

Complete example results

Area
15.58845727
Height
5.19615242
Perimeter
18

Reading the result

Enter lengths in the same unit. Area uses the square of that unit and volume its cube. Height is perpendicular to the base; use a sloping side only when the input explicitly asks for it.

Questions and answers

Can I use the example values for my own calculation?

The example values illustrate the calculation. Replace every input with your own information, especially dates, rates and the selected operation.

Why are some results rounded?

Results display up to 8 decimal places. Calculations use the unrounded values; very small values use scientific notation. JavaScript floating-point arithmetic can introduce tiny rounding differences.

Are my inputs sent to a server?

The calculator processes inputs in your browser. Its code does not send your values to a server.

Methods & accuracy

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