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Average Grade Plane Calculator

This calculator determines the average grade plane elevation and can also clarify if a particular floor is considered a story above grade plane. Please refer to the blog post on this topic for an explanation of how the calculation is performed.

Instructions for the calculator:
  1. For each segment, enter the elevation of each endpoint (Point 1 and Point 2). Enter the length of the segment.
  2. Repeat for each segment around the perimeter of the building.
  3. The Average Grade Plane calculation is displayed at the bottom.
  4. If you are looking to determine if a particular floor is a story above grade plane, enter the elevation of that floor level and the floor level above.
  5. The calculator checks these elevations against the 3 criteria and displays if the floor is a story above grade or not.

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The views, opinions, and information found on this site represent solely the author and do not represent the opinions of any other party, including the author's employer and the International Code Council, nor does the presented material assume responsibility for its use.  Local codes and amendments may vary from the code requirements described herein. Fire protection and life safety systems constitute a critical component of public health, safety and welfare and you should consult with a licensed professional for proper design and code compliance.
  • Home
  • Blog
  • About
  • PE Roadmap
  • Tools
    • Allowable Height & Area Calculator - Separated Mixed Occupancy
    • Allowable Height & Area Calculator - Non-Separated Mixed Occupancy
    • Average Grade Plane Calaculator
    • Calculated Fire Resistance for Wood Walls
    • Fire and Smoke Damper Tool
    • Fire Wall/Exterior Wall Intersection Tool
    • Frontage Calculator
    • IBC Occupant Load Calculator
    • Plumbing Fixture Calculator
    • Stair Pressurization Estimator
  • Startup