Concrete calculator
Concrete driveway
Driveway volume, ready-mix order and bag-equivalent estimate with visible allowance.
Calculator result and formula
Ready-mix order: 6.25 yd³
Formula: L × W × D × quantity ÷ 27 × (1 + waste) → ready-mix order
Formula ID: CONC-DRIVE-001 · Version 1.0.0.
Inputs
- Driveway length: Finished driveway length Default: 30.
- Driveway width: Average finished driveway width Default: 12.
- Concrete depth: Specified finished slab thickness Default: 5.
- Waste factor: Allowance for placement, spill and field variation Default: 10.
How this calculator works
Use finished driveway dimensions and specified thickness to estimate concrete volume before a ready-mix purchase allowance is applied.
- Measure the finished driveway length and average width.
- Enter thickness from the approved project requirements.
- Use the rounded ready-mix quantity as a starting point for a supplier quote.
Worked example: Example: a 30 ft × 12 ft driveway at 5 in depth contains about 5.56 yd³ before allowance; the tool rounds the 10% order to 6.25 yd³.
Assumptions and limitations
- Ready-mix quantity is rounded up to the next 0.25 yd³.
- 60 lb and 80 lb bag yields are planning assumptions of 0.45 ft³ and 0.60 ft³ respectively; confirm the selected product label.
- Truck-load equivalent assumes a 10 yd³ planning load, not supplier delivery capacity.
- Waste is applied to net volume before purchase rounding.
Common questions
- Does this set driveway thickness?
- No. Thickness, reinforcement, base, drainage and local requirements must be independently verified.
- Does it deduct irregular sections?
- Use average width for a simple preliminary estimate, or divide complex geometry into separate sections.
Reference notes
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