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Isosceles Triangle Calculator

Find the height and area from an equal side and base. The base must be shorter than twice the equal side.

Enter your values

Enter a numeric value. Must be greater than zero.
Enter a numeric value. Must be greater than zero.

Use a decimal point, without thousands separators.

Example result
Area
12
Height4

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

Edit inputs

How it works

Find the height and area from an equal side and base. The base must be shorter than twice the equal side.

Inputs and units
Isosceles Triangle Calculator · Inputs and units
InputExample valueWhat to enter
Equal side5Enter a numeric value. Must be greater than zero.
Base6Enter a numeric value. Must be greater than zero.
h = √(a²−b²/4); A = bh/2

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.

Equal side
5
Base
6

Complete example results

Area
12
Height
4

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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