How It Is Calculated
This calculator estimates the concrete volume and cost for a rectangular driveway. The calculation follows these steps:
- Convert the thickness from inches to feet: t = thickness / 12.
- Calculate the volume in cubic feet: Vft = length × width × t.
- Convert to cubic yards: Vyd = Vft / 27.
- Apply the waste factor: Vwaste = Vyd × (1 + waste_factor / 100).
- Calculate the driveway area: A = length × width.
- Calculate the total cost: C = Vwaste × price_per_cy.
A = L × W
t = T / 12
Vft = L × W × t
Vyd = Vft / 27
Vwaste = Vyd × (1 + w / 100)
C = Vwaste × P
Assumptions
- The driveway is rectangular.
- Typical driveway thickness is 4 inches.
- Waste factor is commonly 5–10%.
- Concrete price varies by region and mix design; the default of $150 per cubic yard is a conservative estimate.
- This calculator does not include costs for labor, reinforcement, subbase, or finishing.
Worked Example
For a driveway with length = 30 ft, width = 12 ft, thickness = 4 in, waste factor = 10%, and price per cubic yard = $150:
- Area: A = 30 × 12 = 360 ft².
- Thickness in feet: t = 4 / 12 = 0.3333 ft.
- Volume in cubic feet: Vft = 30 × 12 × 0.3333 = 120 ft³.
- Volume in cubic yards: Vyd = 120 / 27 = 4.4444 yd³.
- Volume with waste: Vwaste = 4.4444 × (1 + 10/100) = 4.8889 yd³.
- Total cost: C = 4.8889 × 150 = $733.33.
- Always order a little extra concrete to account for spillage and uneven subgrade—the waste factor covers this.
- Ensure the subbase is compacted and level before pouring to avoid cracking.
- Consider using reinforcement like rebar or wire mesh for added strength.
- For other aspects of your project, you might find the Concrete slab calculator useful for similar slabs, or the Concrete calculator for general concrete volume needs.
Results: Driveway area = 360.00 ft², Concrete volume = 4.89 yd³, Total concrete cost = $733.33.
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