How Much Asphalt Do I Need?
Start with four pieces of information: the surface area, compacted thickness, the material density, and any project-specific overage.
What to measure
- Length and width for each rectangular section.
- Compacted thickness, usually recorded in inches or millimeters.
- The density listed by the supplier or project specification.
- An allowance for irregular edges, handling, and site conditions.
Irregular driveways
Divide the plan into rectangles rather than trying to force one average width. Add each rectangle as its own section in the driveway calculator.
Why estimates differ
Subgrade conditions, slopes, compaction, drainage work, and the exact mix can change the amount ordered. The best online estimate is still a starting point for a supplier conversation.