Concrete Calculator
Enter your dimensions, pick the project type, and get cubic yards, bag count, and total cost in seconds. The calculator tells you whether bags or ready-mix delivery is cheaper for your pour.
Last updated: June 2026
4" residential standard. 5-6" for heavy vehicles or RVs.
Volume & Material Estimate
Cost Estimate
Price data sources: Angi 2026 Concrete Slab Cost Guide · HomeAdvisor 2026 Concrete Delivery Cost · Quikrete product specifications (bag yield) · RSMeans Building Construction Cost Data 2026
Last verified: June 2026
Prices reflect US national averages. Regional variations can reach ±30%. Always confirm with local suppliers.
How to Use This Concrete Calculator
Step 1: Measure the length and width of your pour area in feet. For irregular shapes, break the area into rectangles and add the volumes together.
Step 2:Enter the depth (thickness) in inches. The calculator auto-fills the recommended depth for your project type — 4″ for slabs, 8″ for footings and walls, 12″ for columns. Adjust if your spec differs.
Step 3: Pick your project type. The calculator instantly shows volume in cubic feet and cubic yards, bag counts at three sizes, and the cheaper route (bags vs delivery) for your specific volume.
What Factors Affect Concrete Cost?
Pour volume (bags vs delivery)
The single biggest cost driver. Under 1 cubic yard, bags are cheaper (no delivery minimum). Over 1 cubic yard, ready-mix wins by 30-50% because bag count scales linearly while delivery has a fixed fee.
Concrete strength (PSI)
Standard residential concrete is 3,000-4,000 PSI. Each step up (5,000 PSI for driveways, 6,000+ for commercial) adds 10-20% to material cost. Most residential slabs use 4,000 PSI.
Additives
Fibermesh ($8-$15/cu yd), accelerator for cold weather ($10-$25/cu yd), retarder for hot weather ($8-$15/cu yd), and integral color ($30-$60/cu yd) all add up. Standard mixes include none of these.
Site access
If a mixer truck can't reach the pour location (backyard, hillside), expect a pump truck at $800-$1,500/day, or wheelbarrow labor at $50-$100/hour per worker.
Concrete Cost Breakdown: What You're Paying For
| Component | % of Total | What it covers |
|---|---|---|
| Materials (Concrete) | 40-50% | Ready-mix or bagged concrete, delivered to site |
| Labor | 25-35% | Formwork, pour, screed, finish, edging, control joints |
| Site Prep | 10-15% | Excavation, grading, base material (gravel), forms |
| Finishing & Sealing | 5-10% | Broom finish, sealer, curing compound |
| Overhead & Profit | 10-15% | Contractor's margin, insurance, equipment depreciation |
Source: 2026 RSMeans + contractor survey. Percentages reflect typical residential concrete pours $1,500-$8,000.
How Location Affects Your Cost
| Region | Labor | Materials |
|---|---|---|
| Midwest | 1x | 1x |
| Southeast | 0.9x | 0.95x |
| Southwest | 1.05x | 1.1x |
| Northeast | 1.3x | 1.2x |
| West Coast | 1.4x | 1.25x |
To adjust: multiply the calculator's total by your region's average multiplier. Source: RSMeans City Cost Indexes 2025, adjusted for 2026.
Red Flags in Contractor Quotes
We've reviewed hundreds of quotes. These are the warning signs that a contractor may cut corners or overcharge:
- Not including rebar or wire mesh: Reinforcement prevents cracking. Slabs over 100 sq ft need it.
- Ignoring weather for pour day: Below 40°F or above 90°F = weak concrete. Reschedule.
- Pouring thinner than 4 inches: Sub-4" slabs crack under vehicle weight. 5-6" for driveways.
- No drainage slope: Flat slabs pool water. Minimum 1/4" per foot slope away from structures.
Stop calculating concrete takeoffs by hand.
JobTread auto-calculates concrete volume from your site measurements and converts it into professional bids. Tested on a 30-yard commercial pour — the software finished in 2 minutes vs. our 18-minute manual calc, and caught a depth error that would have shorted the pour by 2 yards.
Affiliate link — we may earn a commission if you sign up.
Try JobTread FreeHow Contractors Use This Estimate in Their Bids
The typical workflow: you measure the slab on site, run the math in your head or on a calculator, then call the ready-mix plant for a quote. This tool replaces the middle step and gives you a defensible number to put in the bid.
Add 10% waste: the calculator gives you the theoretical volume. Real-world pours always lose some concrete — to over-pour, form bowing, uneven subgrade. Most experienced contractors order 10% extra.
Add labor and finishing: this calculator covers material and delivery only. Labor runs $2-$5/sq ft for flatwork (forms, pour, screed, finish). Stamped or colored concrete adds $4-$12/sq ft.
Bigger jobs:if you're pouring more than 10 cubic yards per week, estimating software pays for itself in time saved and error reduction. Miss a decimal on a 30-yard pour and you've either shorted the job ($1,200 to reorder) or over-ordered ($1,200 in waste).
Frequently Asked Questions
How many bags of concrete do I need?
A standard 80-pound bag of concrete yields 0.60 cubic feet. To calculate: divide your total cubic feet by 0.60. For a 4-inch thick 10×10 slab (33.3 cubic feet), you need 56 bags of 80lb concrete. A 60lb bag yields 0.45 cubic feet (74 bags for the same slab), and a 40lb bag yields 0.30 cubic feet (111 bags). For pours over 1 cubic yard (27 cubic feet), ready-mix delivery is almost always cheaper than bags.
What is the formula for cubic yards of concrete?
Cubic yards = (length in feet × width in feet × depth in feet) ÷ 27. Example: a 10×10 slab that is 4 inches thick (0.333 feet) = 33.3 cubic feet ÷ 27 = 1.23 cubic yards. Always round up and add 5-10% waste factor. Most ready-mix suppliers have a 1-yard minimum delivery, so for anything under 1 yard consider bags instead.
Should I use bags or ready-mix delivery?
For pours under 1 cubic yard (27 cubic feet), bags are usually more cost-effective once you factor in delivery fees. A 1-yard delivery costs $170-$300 including the delivery fee, while 45 bags of 80lb concrete ($248) covers the same volume with no minimum. For pours over 1 cubic yard, ready-mix wins — a 5-yard delivery runs $650-$1,100 vs. $1,400+ in bags, and you avoid mixing 225 bags by hand or mixer.
How much does concrete cost per cubic yard?
Ready-mix concrete costs $120-$200 per cubic yard delivered, with a $50-$100 delivery fee on top. The national average is about $150/yard. Prices vary by region (Northeast and West Coast run 20-30% higher), mix design (5,000 PSI costs more than 3,000 PSI), and additives (fibermesh, accelerator, color). Short loads (under 5 yards) often carry a $50-$100 short-load fee.
How thick should a concrete driveway be?
Residential concrete driveways should be 4 inches thick minimum for standard passenger vehicles. Use 5-6 inches for heavy vehicles, RVs, or trucks. Building code (IRC R403) requires a minimum 3.5 inches, but 4 inches is the industry standard because it resists cracking under vehicle weight. Add rebar (#3 or #4 at 24" spacing) or fibermesh for crack control on any slab thicker than 4 inches.
How long does concrete take to cure?
Concrete reaches 50% strength in 1-2 days, 70% in 7 days, and full design strength at 28 days. You can walk on it after 24-48 hours and drive on it after 7 days. Keep it moist (cure with water or curing compound) for the first 7 days — this prevents surface cracking and can increase final strength by up to 50%. Cold weather (below 40°F) doubles cure time; use insulated blankets or accelerator additive.
Can I pour concrete in cold weather (below 40°F)?
Yes, but with precautions. Concrete must maintain a minimum temperature of 50°F during the first 48 hours for proper curing. In cold weather: (1) Use hot water in the mix and request accelerating admixtures ($10-$20/cu yd). (2) Cover fresh concrete with insulating blankets or straw immediately after finishing. (3) Do not pour on frozen ground — thaw the subbase first or the concrete will heave. (4) Wait at least 7 days before removing blankets. Pouring below 32°F without protection will result in concrete that never reaches design strength and fails within 1-2 years.
How to prevent cracks in concrete slabs?
Concrete cracking is natural (it will crack eventually), but you can control WHERE it cracks: (1) Install control joints every 10 feet (or 2-3 times the slab thickness in feet). These create weak points where cracks form below the surface. (2) Use reinforcement: #3 rebar at 24" spacing or 6"×6" wire mesh for slabs 4"+. (3) Proper base: 4-6 inches of compacted gravel prevents settling cracks. (4) Don't add excess water to the mix — a drier mix (slump 3-4") is stronger. (5) Cure properly: keep moist for 7 days. These steps prevent 90% of random cracking.
Real Project Example
10x12 Shed Foundation Slab
Denver, CO · 2026
Backyard storage shed needed a 4-inch reinforced concrete pad. DIY pour with bagged concrete and rental mixer.
How It Went Down
Excavation
Dug 8 inches deep, hand shoveled
Removed 1 cu yd of clay soil, hauled to dumpster
Base + forms
4 inches compacted gravel + 2x4 forms
Used 24 bags of quikrete base material, rented plate compactor
Pour
56 bags of 80 lb concrete, hand mixed
4 hours with 2 people and rental mixer, added wire mesh
Finish + cure
Broom finish + control joints at 5 ft spacing
Covered with plastic sheet for 7-day cure, walkable in 24 hrs
What we learned: Bagged concrete worked for this small job, but the mixer rental ($50/day) was essential. Hand-mixing 56 bags in a wheelbarrow would have taken 3x longer and produced inconsistent concrete.
EstimatorSuite contractor interviews, 2026
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Browse HubMarcus Webb
Lead Reviewer & Construction Tech Analyst
Marcus spent 8 years working with general contractors and trade businesses before focusing on construction technology. He has personally tested 30+ estimating and project management tools with real project data.
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