Calculate cubic yards, bag count, and estimated Columbia SC concrete cost for driveways, patios, slabs, footings, post holes, and foundations using feet and inches.
Enter project dimensions to estimate volume, ready-mix quantity, bag count, and approximate Columbia SC material cost.
Driveways usually use 4–5 inches with 3,500 to 4,000 PSI and a 10% waste factor.
Walkway 4 in · Patio 4 in · Driveway 4–5 in · Garage 5–6 in · Footing varies by design
Columbia-area concrete estimates are commonly influenced by slab thickness, reinforcement, site access, finishing level, and whether you are pricing raw ready-mix only or full installed work. Across South Carolina, overall construction pricing tends to run below the national average, which can make local concrete budgets more favorable than many larger U.S. metro markets. For quick budgeting, it helps to separate volume cost from installed square-foot pricing so you can compare contractor bids more clearly.
For many South Carolina projects, installed concrete often falls in the $4 to $10 per square foot range depending on thickness, finish, prep work, reinforcement, and access. For raw ready-mix estimating, a practical Columbia-style planning range is around $105 to $139 per cubic yard before additives, short-load fees, and delivery minimums.
A 20 × 20 ft driveway at 4 inches is about 4.94 cubic yards before waste. With a 10% overage, the order quantity becomes about 5.5 cubic yards, which is why ready-mix usually makes more sense than bag mixing for this size.
A 12 × 16 ft patio at 4 inches needs about 2.37 cubic yards before waste. Ordering around 2.6 cubic yards gives a more realistic target when edges, grade changes, and cleanup loss are considered.
A 20 × 24 ft garage slab at 5 inches uses roughly 7.41 cubic yards before waste. Once overage is added, most planners will budget close to 8.2 cubic yards plus reinforcement and base preparation.
Measure length and width in feet, then enter slab thickness in inches. The calculator converts cubic feet to cubic yards, adds your waste factor, and shows a rough material budget based on project type and PSI. For most residential slabs, the safest habit is to add at least 10% extra so you do not come up short during the pour.
Ready-mix plants often charge extra on small orders, so low-volume pours can have a higher per-yard cost than large slab orders. If your result is well under a full truck, compare bag cost, trailer mix, and local delivery minimums before ordering.
Use lower PSI options for light-duty walkways and patios, then step up to 3,500 or 4,000 PSI for driveways, garage slabs, and heavier traffic areas. Reinforcement, grading, and a compacted base can matter just as much as concrete strength for long-term performance.
These examples give quick planning numbers for common residential projects using standard shapes. Actual bids can move higher or lower based on finish type, pump access, demolition, excavation, edging, reinforcement, and crew minimums.
| Project | Size | Thickness | Concrete Needed | Order Qty | Raw Ready-Mix Range | Installed Budget Range |
|---|---|---|---|---|---|---|
| Walkway | 4 × 30 ft | 4 in | 1.48 cu yd | 1.63 cu yd | $171 – $227 | $480 – $1,200 |
| Patio | 12 × 16 ft | 4 in | 2.37 cu yd | 2.61 cu yd | $274 – $363 | $768 – $1,920 |
| Driveway | 20 × 20 ft | 4 in | 4.94 cu yd | 5.43 cu yd | $570 – $755 | $1,600 – $4,000 |
| Garage Slab | 20 × 24 ft | 5 in | 7.41 cu yd | 8.15 cu yd | $856 – $1,133 | $1,920 – $4,800 |
| Backyard Slab | 24 × 24 ft | 4 in | 7.11 cu yd | 7.82 cu yd | $821 – $1,087 | $2,304 – $5,760 |
Use these links for extra estimating help, supplier reference, and concrete volume planning.
Check a supplier-style concrete volume tool for quick cross-verification before placing an order.
Open ResourceUse another well-known calculator to compare cubic-yard totals for slabs, footings, and standard shapes.
Open ResourceReview a broader state-level concrete pricing reference when comparing raw material and installed budget ranges.
Open Resource