Concrete Coverage Calculator USA | How Much Does Concrete Cover? | Free Tool
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Concrete CoverageCalculator USA — Area & Volume Estimator
Calculate how much area one cubic yard of concrete covers at any thickness — or enter your project dimensions to find exact cubic yards, bags needed & estimated cost for slabs, driveways, patios & more.
A concrete coverage calculator helps homeowners, contractors, and DIYers in the USA determine how much surface area a given amount of concrete will cover at a specific thickness — or work in reverse, starting with your project dimensions to find exactly how many cubic yards or bags you need. One cubic yard of concrete (27 cubic feet) covers approximately 81 square feet at 4 inches thick, 54 square feet at 6 inches thick, or 162 square feet at 2 inches thick. Enter your project type, area, and desired thickness below to get instant coverage calculations, bag counts for Quikrete and Sakrete, and estimated material costs based on current 2026 US pricing.
📐 Concrete Coverage Calculator — USA
Enter your project details to calculate coverage area, volume, bags & cost.
Standard 4 in. thick slab — most common for patios, shed pads & walkways.
Concrete coverage refers to the surface area that a given volume of concrete will cover at a specific thickness. In the US, concrete is sold by the cubic yard for ready-mix delivery and by the bag (40 lb, 60 lb, or 80 lb) for smaller DIY projects. Understanding coverage is essential to avoid ordering too little (causing cold joints and delays) or too much (wasting money on excess material that hardens before use).
The calculation is simple: divide the total volume (in cubic feet) by the thickness (in feet) to get the area covered. Since one cubic yard equals 27 cubic feet, a 4-inch (0.333 ft) thick slab gets: 27 ÷ 0.333 = 81 square feet per cubic yard. For bagged concrete, one 80 lb bag covers 0.60 cubic feet, which translates to approximately 1.8 square feet at 4 inches thick.
🔵 Quick Concrete Coverage Reference
At 4 inches thick: 1 cubic yard covers 81 sq ft, one 80 lb bag covers 1.8 sq ft. At 6 inches thick: 1 cubic yard covers 54 sq ft, one 80 lb bag covers 1.2 sq ft. At 2 inches thick (overlay): 1 cubic yard covers 162 sq ft, one 80 lb bag covers 3.6 sq ft. Always add 10% waste to your calculation.
🏠 Slab & Patio Coverage (4 in.)
A standard 4-inch residential slab is the most common pour in the USA — used for patios, shed pads, walkways, and small structures. One cubic yard covers 81 sq ft. A typical 10×12 ft patio (120 sq ft) requires approximately 1.5 cubic yards or 67 bags of 80 lb concrete including 10% waste.
🚗 Driveway Coverage (6 in.)
Driveways in the US are typically poured at 6 inches thick to support vehicle loads. At this thickness, one cubic yard covers only 54 sq ft. A standard two-car driveway (20×24 ft = 480 sq ft) requires about 9.8 cubic yards of ready-mix concrete. Most ready-mix suppliers require a minimum order of 1 cubic yard.
🛤️ Sidewalk Coverage (4 in.)
Public sidewalks and residential walkways are typically 4 inches thick and 4–5 feet wide. A 50-foot sidewalk at 4 ft wide (200 sq ft) needs approximately 2.7 cubic yards with 10% overage. Most US municipalities require a minimum of 3,500 PSI concrete and control joints every 5 feet for public sidewalk projects.
How to Calculate Concrete Coverage
Calculating concrete coverage requires three pieces of information: the area of your project (length × width), the thickness of the pour, and a waste factor. The formula works in any direction — you can find how much area a given volume covers, or how much volume a given area requires.
Coverage (sq ft per cu yd) = 27 ÷ [Thickness (in) ÷ 12]
80 lb Bags = Volume (cu ft) ÷ 0.60 × Waste Factor
Example: 20 ft × 15 ft × 4 in. = 100 cu ft = 3.7 cu yd → covers 300 sq ft
⚠️ Always Order 10% Extra — Concrete Waits for Nobody
Concrete begins to set within 60–90 minutes of mixing (less in hot weather). If you run short mid-pour, you'll create a cold joint — a weak seam that cracks and leaks. For ready-mix, most US plants charge $15–$30 per returned cubic yard, which is far less than the cost of a second delivery. For bags, unopened bags can be returned to Home Depot or Lowe's within 90 days.
Concrete Coverage Reference Table — Square Feet per Cubic Yard
Quick-reference table showing how many square feet one cubic yard of concrete covers at common US slab thicknesses, plus the number of 80 lb bags equivalent and typical project types.
Thickness
Coverage per Cu Yd
80 lb Bags per Cu Yd
Coverage per 80 lb Bag
Typical Project
Min. PSI
2 in.
162 sq ft
45 bags
3.6 sq ft
Overlay / Resurfacing
3,000 PSI
3 in.
108 sq ft
45 bags
2.4 sq ft
Lightweight walkway
3,000 PSI
4 in.
81 sq ft
45 bags
1.8 sq ft
Slab, patio, sidewalk
3,500 PSI
5 in.
64.8 sq ft
45 bags
1.44 sq ft
Heavy-duty slab
4,000 PSI
6 in.
54 sq ft
45 bags
1.2 sq ft
Driveway, garage floor
4,000 PSI
8 in.
40.5 sq ft
45 bags
0.9 sq ft
Foundation wall
4,000 PSI
10 in.
32.4 sq ft
45 bags
0.72 sq ft
Thickened edge / footing
4,000 PSI
12 in.
27 sq ft
45 bags
0.6 sq ft
Deep footing
4,500 PSI
2 in. — Overlay / Resurfacing
Coverage / Cu Yd162 sq ft
Coverage / 80 lb Bag3.6 sq ft
80 lb Bags / Cu Yd45 bags
Min. PSI3,000
3 in. — Lightweight Walkway
Coverage / Cu Yd108 sq ft
Coverage / 80 lb Bag2.4 sq ft
80 lb Bags / Cu Yd45 bags
Min. PSI3,000
4 in. — Slab, Patio, Sidewalk
Coverage / Cu Yd81 sq ft
Coverage / 80 lb Bag1.8 sq ft
80 lb Bags / Cu Yd45 bags
Min. PSI3,500
5 in. — Heavy-Duty Slab
Coverage / Cu Yd64.8 sq ft
Coverage / 80 lb Bag1.44 sq ft
80 lb Bags / Cu Yd45 bags
Min. PSI4,000
6 in. — Driveway, Garage Floor
Coverage / Cu Yd54 sq ft
Coverage / 80 lb Bag1.2 sq ft
80 lb Bags / Cu Yd45 bags
Min. PSI4,000
8 in. — Foundation Wall
Coverage / Cu Yd40.5 sq ft
Coverage / 80 lb Bag0.9 sq ft
80 lb Bags / Cu Yd45 bags
Min. PSI4,000
10 in. — Thickened Edge / Footing
Coverage / Cu Yd32.4 sq ft
Coverage / 80 lb Bag0.72 sq ft
80 lb Bags / Cu Yd45 bags
Min. PSI4,000
12 in. — Deep Footing
Coverage / Cu Yd27 sq ft
Coverage / 80 lb Bag0.6 sq ft
80 lb Bags / Cu Yd45 bags
Min. PSI4,500
Concrete Coverage Cost Comparison — USA 2026 Pricing
Approximate costs for concrete by source type, including delivery fees, bag pricing, and coverage per dollar across the United States.
Source
Cost per Unit
Cost per Cu Yd
Cost per Sq Ft (4 in.)
Best For
Ready-Mix Truck
$140–$200/cu yd
$140–$200
$1.73–$2.47
1+ cubic yards
Short-Load Fee (under 5 yd)
+$50–$100 flat
$190–$300
$2.35–$3.70
1–4 cubic yards
80 lb Bags (Quikrete)
$8.50–$10 / bag
~$383–$450
$4.72–$5.56
Under 1 cubic yard
60 lb Bags
$6.50–$8 / bag
~$390–$480
$4.81–$5.93
Small DIY jobs
40 lb Bags
$5.00–$6.50 / bag
~$450–$585
$5.56–$7.22
Repairs, patches
Volumetric Mixer Truck
$160–$220/cu yd
$160–$220
$1.98–$2.72
Remote / varied pours
Ready-Mix Truck
Cost per Cu Yd$140–$200
Cost / Sq Ft (4 in.)$1.73–$2.47
Best For1+ cubic yards
Short-Load Fee (under 5 yd)
Cost per Cu Yd$190–$300
Cost / Sq Ft (4 in.)$2.35–$3.70
Best For1–4 cubic yards
80 lb Bags (Quikrete)
Cost per Cu Yd~$383–$450
Cost / Sq Ft (4 in.)$4.72–$5.56
Best ForUnder 1 cubic yard
60 lb Bags
Cost per Cu Yd~$390–$480
Cost / Sq Ft (4 in.)$4.81–$5.93
Best ForSmall DIY jobs
40 lb Bags
Cost per Cu Yd~$450–$585
Cost / Sq Ft (4 in.)$5.56–$7.22
Best ForRepairs, patches
Volumetric Mixer Truck
Cost per Cu Yd$160–$220
Cost / Sq Ft (4 in.)$1.98–$2.72
Best ForRemote / varied pours
Tips for Maximizing Concrete Coverage in the USA
Prepare a level, compacted sub-base — an uneven subgrade wastes concrete by filling low spots. Compact the gravel base with a plate compactor (rent for $50–$70/day at Home Depot) and verify grade with a long straightedge before the pour.
Use forms to contain the pour — properly staked 2×4 or 2×6 lumber forms prevent concrete from spreading beyond the intended area. Set forms at the correct height (4 in. for slabs, 6 in. for driveways) and check level with a string line.
Order ready-mix for anything over 1 cubic yard — bagged concrete costs 2–3× more per cubic yard than ready-mix and takes significantly longer to mix. The crossover point where ready-mix becomes cheaper is approximately 0.75 to 1.0 cubic yard (about 34–45 bags of 80 lb).
Request the right slump — for slabs and driveways, ask for 4-inch slump concrete. Higher slump (more water) is easier to work but weaker and more prone to cracking. Lower slump (2–3 inches) is used for foundations where forms contain the concrete.
Time your pour for moderate weather — ideal pouring temperature is 50°F–80°F. Avoid pouring in direct sun above 90°F (causes rapid surface drying) or below 40°F (risk of freezing before curing). Early morning pours in summer are standard practice across the southern USA.
Keep finished concrete moist for 7 days — proper curing increases final strength by 50% compared to uncured concrete. Use curing compound, plastic sheeting, or regular misting to maintain moisture during the first week.
Frequently Asked Questions — Concrete Coverage USA
How many square feet does one cubic yard of concrete cover?+
It depends on the thickness. One cubic yard (27 cubic feet) covers: 162 sq ft at 2 in., 108 sq ft at 3 in., 81 sq ft at 4 in., 54 sq ft at 6 in., 40.5 sq ft at 8 in., 27 sq ft at 12 in. The formula is: Coverage (sq ft) = 27 ÷ (Thickness in inches ÷ 12). The most common residential thickness in the USA is 4 inches (81 sq ft per cubic yard).
How many 80 lb bags of concrete do I need per 100 square feet?+
At 4 inches thick, 100 sq ft requires approximately 33.3 cubic feet of concrete (100 × 4/12). Each 80 lb bag covers 0.60 cu ft, so: 33.3 ÷ 0.60 = 56 bags (before waste). With 10% overage: 62 bags. At 6 inches thick: 83 bags with waste. At 2 inches thick: 31 bags with waste. At $9.25 per 80 lb bag, 100 sq ft at 4 in. costs approximately $570 in bags — vs. ~$200–$250 for ready-mix.
When should I use ready-mix vs. bags of concrete?+
Use bagged concrete for projects under 0.5 cubic yards (~22 bags of 80 lb) — small pads, post holes, repairs, and patches. Use ready-mix for anything over 1 cubic yard (45+ bags). Between 0.5 and 1 cubic yard is a gray area — ready-mix with a short-load fee ($50–$100) is often comparable in cost to bags and far less labor-intensive. For reference: a 10×10 ft slab at 4 in. thick = 1.23 cu yd = ready-mix territory. A single 4×4 ft post pad at 4 in. = 0.02 cu yd = bag territory.
How much does a concrete driveway cost per square foot?+
In the USA (2026), a standard residential concrete driveway costs approximately $8–$15 per square foot installed, including material, labor, grading, forming, pouring, and finishing. This breaks down to: material ~$2–$3/sq ft (6 in. ready-mix), labor ~$4–$8/sq ft, and prep/finishing ~$2–$4/sq ft. A typical 20×24 ft two-car driveway (480 sq ft) costs between $3,840 and $7,200 total. Stamped or decorative concrete adds $2–$6/sq ft. Prices vary significantly by region — expect higher costs in California, the Northeast, and major metros.
How thick should a concrete slab be for a patio?+
For a standard residential patio with foot traffic and patio furniture, 4 inches is the standard minimum used across the USA. For patios that will support hot tubs (which can weigh 3,000–6,000 lbs when full), outdoor kitchens, or heavy planters, increase to 5–6 inches with a compacted gravel sub-base. In areas with expansive clay soil (Texas, Colorado, parts of the Midwest), a 6-inch slab with #4 rebar at 18" o.c. both ways is recommended to resist soil movement. Always pour on a minimum 4-inch compacted gravel base.
What is the minimum concrete order from a ready-mix plant?+
Most US ready-mix plants have a minimum order of 1 cubic yard, but deliveries under 5 cubic yards typically incur a short-load fee of $50–$100. Some plants have higher minimums (3 yd) in rural areas. If you need less than 1 cubic yard, consider: 1) Using bagged concrete; 2) Renting a small trailer-mounted mixer (0.5–1 yd capacity) from Home Depot (~$75/day); or 3) Ordering from a volumetric mixer truck, which only charges for what you use with no minimum and no short-load fee.
How do I calculate concrete coverage for an irregular shape?+
For irregular or curved shapes, break the area into smaller sections that approximate rectangles, triangles, or circles: Rectangle: Length × Width. Triangle: 0.5 × Base × Height. Circle: π × Radius² (3.14 × R²). Add all sections together for the total area, then multiply by thickness ÷ 12 to get volume. For very irregular shapes, use the grid method — lay a measured grid over your area and count the full and partial squares. Add 15–20% waste for irregular shapes instead of the standard 10%.
Trusted guides, product specs, and pricing references for your next concrete project.
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Quikrete Coverage Charts
Official Resource
Official Quikrete product coverage charts for all 40/60/80 lb concrete, mortar, and specialty mix products — including sq ft per bag at various thicknesses and project calculators.
National Ready Mixed Concrete Association — find local ready-mix suppliers, learn about ordering concrete, slump specifications, and delivery logistics for projects of any size across the USA.
Shop and compare Quikrete, Sakrete, and store-brand concrete bags at Home Depot — with current pricing, coverage specs, delivery options, and in-store availability by zip code.