This web page contains a live and functional spreadsheet created with
Average Grade Plane Calculator
Is the level in question a story above grade plane?
Point 1 Elevation
Point 2 Elevation
Avg. Elev * Length
Elevation of Level in Question (ft):
Elevation of Level Above (ft):
Is the floor surface of the story in question located entirely above the grade plane elevation?
Is the floor surface of the floor above the story in question located more than 6 feet above the grade plane elevation?
Is the floor surface of the floor above the story in question located more than 12 feet above any of the grade measurements at any point along the building exterior walls?
Average Grade Plane
= (Elevation Total/Total Segment Length)