Real sites are not one rectangle. Add a row per section — driveway, apron, turnaround, parking aisle — in any mix of rectangles, circles, triangles, and trapezoids. Every row gets its own tonnage in the breakdown table, and the totals roll up into order quantity and truckloads with the final-load remainder.
Total = Σ row areas • Net tons = (Total sq ft × Thickness in ÷ 12) × Density ÷ 2,000 • Order = Net × (1 + Allowance %)
| Symbol | Variable | Unit | Notes |
|---|---|---|---|
| Aᵢ | Row area | sq ft | Rectangle L×W; circle π(d/2)²; triangle ½·b·h; trapezoid ½(a+b)·h. Metric inputs are converted first. |
| T | Compacted thickness | in | Uniform across rows in this tool; for different lifts per section, run each separately. |
| D | Density | lb/ft³ | Planning default 145; use the mix-design value when known. |
| AL | Allowance | % | Applied once to the summed total, never per row. |
Every number below is produced by the same engine at build time — not typed by hand.
Asphalt to order: 22.84 US tons
Asphalt to order: 34.15 US tons
Split it into simple shapes — rectangles for straight runs, a trapezoid for a widening apron, a circle or triangle for turnarounds — enter one row each, and the calculator sums areas, converts to tons at your thickness and density, and applies allowance once.
Pick one length unit for the whole run with the unit selector. Mixed-unit takeoffs are a classic source of 3.28× errors; keep one ruler per calculation.
Because allowance is applied once at the total, not per row. The table shows net tons per section so you can stage deliveries; the order quantity adds the single total-level buffer.
Set the truck capacity and the result reports whole loads plus the final-load remainder — the number suppliers need for scheduling and short-load decisions.