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Asphalt Tonnage, Volume, and Cost Formulas

Review the asphalt calculator formulas for area, compacted volume, density, US tons, metric tonnes, waste, truckloads, coverage, and material cost.

How do the Asphalt Calculator formulas work?

This formula page defines the variables used by the Asphalt Calculator, shows how those values are combined, and explains the order of operations behind the result. Use the worked steps to verify an estimate, compare scenarios, and understand which assumptions or rounding rules can affect the displayed answer.

Formula Overview

The engine normalizes dimensions and density, calculates compacted volume, converts volume to weight, applies waste, and then calculates whole truckloads and optional material cost from the entered assumptions.

Variable Definitions

  • L: length, W: width, T: compacted thickness
  • q: number of identical areas
  • ρ: entered compacted asphalt density
  • w: entered waste percentage
  • C: entered truck capacity
  • P: entered price per weight unit

Area and Compacted Volume

A=L×W×qA=L\times W\times q
V=A×TV=A\times T

Dimensions are normalized before multiplication. For US calculations, thickness in inches is divided by 12 to convert it to feet.

Weight and Tonnage

Weightlb=Vft3×ρlb/ft3Weight_{lb}=V_{ft^3}\times\rho_{lb/ft^3}
US tons=Weightlb2000US\ tons=\frac{Weight_{lb}}{2000}
Metric tonnes=US tons×0.90718474Metric\ tonnes=US\ tons\times0.90718474

Waste, Truckloads, and Cost

Order tons=Net tons(1+w100)Order\ tons=Net\ tons\left(1+\frac{w}{100}\right)
Truckloads=⌈Order tonsC⌉Truckloads=\left\lceil\frac{Order\ tons}{C}\right\rceil
Material cost=Order weight×PMaterial\ cost=Order\ weight\times P

Truckloads round up to a whole load for planning. Cost uses the selected US-ton or metric-tonne pricing basis.

Coverage Per US Ton

Coverageft2/ton=2000ρlb/ft3×TftCoverage_{ft^2/ton}=\frac{2000}{\rho_{lb/ft^3}\times T_{ft}}

Coverage changes with both compacted thickness and entered density. Doubling thickness halves coverage when density remains unchanged.

Unit Conversions

  • 12 inches = 1 foot
  • 3 feet = 1 yard
  • 0.3048 meters = 1 foot
  • 2,000 pounds = 1 US ton
  • 1 US ton = 0.90718474 metric tonnes

Display rounding occurs after the Decimal.js calculation is complete.

Worked Tonnage Calculation

For a 10 ft × 25 ft area at 4 in compacted thickness:

V=10×25×412=83.333 ft3V=10\times25\times\frac{4}{12}=83.333\ ft^3

At 148 lb/ft³, weight is 83.333 × 148 = 12,333.33 lb. Dividing by 2,000 produces approximately 6.167 US tons before waste.

Assumptions and Boundaries

  • Entered dimensions describe uniform finished rectangles.
  • Thickness is the compacted lift depth.
  • Density applies uniformly to the selected area.
  • Waste applies after net weight is calculated.
  • Truckloads and cost use the entered capacity and price basis.
  • Pavement design and installation requirements are excluded.

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