# Pyramid Frustum Calculator

> Calculate volume and surface area for a square-pyramid frustum.

Page: https://askcalculators.com/calculator/pyramid-frustum-calculator/
Definition: https://askcalculators.com/calculator/pyramid-frustum-calculator/definition.json
JSON Schema: https://askcalculators.com/calculator/pyramid-frustum-calculator/schema.json
Version: 1.0.0
Maintained by: AskCalculators (software project; not a credentialed reviewer)
Qualified review: pending. Automated checks do not establish professional approval.
Page status: Live
Review status: Pending

## Use
Open the calculator page and enter values. Query-string parameters can restore and bookmark a calculation.
Example: https://askcalculators.com/calculator/pyramid-frustum-calculator/?bottomSide=10&topSide=6&height=8

## Inputs
- bottomSide: Bottom square side a; type=number; required; default=10; min=0.000001
- topSide: Top square side b; type=number; required; default=6; min=0
- height: Vertical height h; type=number; required; default=8; min=0.000001

## Outputs
- volume: Volume; format=number; primary
- lateralArea: Lateral area; format=number
- surfaceArea: Total surface area; format=number
- slantHeight: Slant height; format=number

## Formula
V = h(a² + ab + b²) ÷ 3; lateral area = 2(a + b)ℓ

## Rules
- Empty optional inputs are undefined, not zero.
- Hidden conditional inputs are ignored.
- Do not invent missing required inputs.