Paving Sub Base Calculator

Sub Base Tonnage Formula:

\[ T = \frac{A \times D \times \rho}{2000} \]

Sub Base Tonnage (tons):

Definition: This calculator estimates the tonnage of sub base material needed for paving projects based on area, depth, and material density.

Purpose: It helps construction professionals and landscapers determine how much sub base material is required for stable paving foundations.

The calculator uses the formula:

\[ T = \frac{A \times D \times \rho}{2000} \]

Where:

Explanation: The formula calculates volume in cubic feet, converts to pounds using density, then converts to tons by dividing by 2000.

Details: Proper sub base estimation ensures stable paving surfaces, prevents settling, and helps with accurate material ordering.

Tips: Enter the area in square feet, depth in feet, and material density (default 110 lb/ft³). All values must be > 0.

Q1: What's a typical sub base depth?
A: For driveways, 4-6 inches (0.33-0.5 ft); for walkways, 2-4 inches (0.17-0.33 ft).

Q2: What density should I use?
A: 100-130 lb/ft³ is typical for compacted gravel sub base (default 110).

Q3: Does this include compaction factor?
A: The density value should account for compaction - use higher values for more compacted material.

Q4: How do I convert inches to feet for depth?
A: Divide inches by 12 (e.g., 6 inches = 0.5 feet).

Q5: Should I add extra for waste?
A: Yes, consider adding 5-10% to the calculated tonnage for project contingencies.