Elevator Pit Depth Calculator

Pit depth from car height and buffer requirements.

Rated speed (m/s)

Buffer type

Car inside height (m)

Compensating sheave

Additional margin (mm)

Tab to move between fields

Required pit depth (m)

1.5

Pit depth (mm)1,500

Buffer stroke (mm)150

Pit ladder height (m)2.4

Sump pump needed1

How to Use This Calculator

Enter the Rated Speed (m/s) — this is the primary determinant of pit depth requirements.
Select Buffer Type (oil or spring) per the elevator design.
Input Car Inside Height (m) and toggle Compensating Sheave if present.
Set the Additional Safety Margin (mm) required by your AHJ.
Review Required Pit Depth (m and mm) to specify in architectural drawings.

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