Slant Height Calculator

Calculate slant height for cones and square pyramids.

Last updated: June 2026 | By Patchworkr Team

Vertical Height

Radius

Height is required.

Cone: l = sqrt(h^2 + r^2). Square pyramid: l = sqrt(h^2 + (s/2)^2).

Live Results

Enter valid dimensions to see results.

Formulas

Cone: l = sqrt(h^2 + r^2)

Square pyramid: l = sqrt(h^2 + (s/2)^2)

Assumption: This calculator uses right cones and right square pyramids.

Cone example: h = 8, r = 6

Slant height: sqrt(8^2 + 6^2) = sqrt(100) = 10

Square pyramid example: h = 8, s = 10

Slant height: sqrt(8^2 + 5^2) = sqrt(89) about 9.43398113

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