Calculate volume and weight of road base material (Class 5 / ABC stone) for construction and paving projects.
Last updated: March 2026
Road base (Class 5 or ABC stone) is a mixture of crushed gravel, sand, and clay that serves as the foundation layer for roads, driveways, and parking lots. It compacts firmly when properly laid and provides excellent drainage and stability.
Composition: Typically 3-4 inch crushed stone, gravel, and fines. The mix ensures proper compaction and load distribution. Common applications: driveway base, road sub-base, parking lots, and construction ground preparation.
Density: Road base weighs approximately 1.6 metric tons per cubic yard (or ~3,200 lbs per cubic yard), accounting for compaction.
Road base for a 100 ft × 20 ft driveway (6 inches deep):
Class 5 (ABC stone stands for "aggregate base course") is a standardized mixture of 3-4 inch stones, gravel, sand, and fines designed for compaction and proper load distribution under pavement.
Standard driveway base is 4-6 inches. Heavier traffic areas may need 6-8 inches. Always check local building codes and frost lines.
Gravel is loose aggregate. Class 5 includes fines (sand/clay) that bind together when compacted, creating a stable, hard-packed surface.
Yes, if building on soft soil, add fill or compact existing soil first. Road base works best on firm, prepared ground.
Properly installed and maintained, 10-15+ years. Recompact annually and top-dress as needed. Poor drainage shortens lifespan.
Yes, recycled asphalt (RAP) works as a durable base alternative. It compacts nearly as well and is often cheaper, but check local availability.
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