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Isosceles Triangle Side Calculator

Result

Calculated result 5 Based on the values entered.
↗ Math

Isosceles Triangle Side Calculator — free online calculator.

Formula

sqrt(height^2+(base/2)^2)
  • Isosceles Triangle Side Calculator calculates its result from Height, Base. It uses the formula sqrt(height^2+(base/2)^2). Change any input to recalculate the result instantly.
  • The main inputs are Height, Base. Enter them in the units and format shown in the calculator.
  • Keep comparable quantities in compatible units whenever the formula combines or compares them.
  • Changing any input above recalculates the result with the same calculation engine used by this page.

Example: Isosceles Triangle Side

Inputs
  • Height: 4
  • Base: 6

Using Height = 4, Base = 6, the calculated result is 5.

Sample result: Calculating…

Frequently asked questions

What does the Isosceles Triangle Side calculate?

Isosceles Triangle Side Calculator — free online calculator.

Which values should I enter?

Enter Height, Base using the units and format shown beside each field.

What formula does this calculator use?

The calculator uses the following relationship: sqrt(height^2+(base/2)^2).

Why might my result differ from another source?

Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.

Does the result update automatically?

Yes. Changing an input updates the result using the same calculation engine shown on this page.

Page information

Updated: October 7, 2026