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concrete Concrete Slab Calculate concrete yards and bags for garage slabs, shed bases, pads, and flatwork. concrete Concrete Bag Convert slab dimensions into 40 lb, 60 lb, and 80 lb concrete bag counts. concrete Driveway Concrete Estimate ready-mix concrete and bag counts for a residential driveway slab. concrete Post Hole Concrete Calculate concrete bags for fence post holes, deck posts, and footings. concrete Concrete Yards Calculate cubic yards of concrete from project dimensions. concrete Patio Concrete Estimate concrete yards and bags for a backyard patio or outdoor pad. materials Gravel Calculate gravel cubic yards and approximate tons from area and depth. construction Square Footage Calculate square footage from length and width for material planning.
Concrete
View all Concrete Slab Calculator Calculate concrete yards and bags for garage slabs, shed bases, pads, and flatwork. Driveway Concrete Calculator Estimate ready-mix concrete and bag counts for a residential driveway slab. Patio Concrete Calculator Estimate concrete yards and bags for a backyard patio or outdoor pad. Sidewalk Concrete Calculator Calculate concrete for sidewalks, walkways, and narrow slab pours. Concrete Footing Calculator Estimate concrete yards and bags for continuous strip footings. Concrete Wall Calculator Estimate concrete yards for wall pours using length, height, and thickness. Concrete Column Calculator Calculate concrete volume for round columns and piers. Concrete Stairs Calculator Estimate concrete for solid stair pours using width, tread depth, riser height, and step count. Post Hole Concrete Calculator Calculate concrete bags for fence post holes, deck posts, and footings. Concrete Bag Calculator Convert slab dimensions into 40 lb, 60 lb, and 80 lb concrete bag counts. Concrete Yards Calculator Calculate cubic yards of concrete from project dimensions. Concrete Cubic Feet Calculator Calculate concrete cubic feet, cubic yards, and cubic meters. Rebar Calculator Estimate rebar sticks for a rectangular reinforcement grid.
Materials
Gravel Calculator Calculate gravel cubic yards and approximate tons from area and depth. Sand Calculator Estimate sand volume and tons for leveling beds, pavers, and base layers. Mulch Calculator Calculate mulch cubic yards for planting beds and landscape areas. Topsoil Calculator Estimate topsoil cubic yards and approximate tons by area and depth.
Finishing
Paver Calculator Estimate paver count for patios and walkways using area and common paver sizing. Deck Board Calculator Estimate deck board count from deck length, depth, board width, gap, and stock length. Tile Calculator Estimate tile boxes with a 10% waste allowance. Paint Calculator Estimate paint gallons for walls or flat surfaces using square footage and common coverage. Square Footage Calculator Calculate square footage from length and width for material planning.
Concrete notes
Check the assumptions before you order
Job-specific calculators
Input dimensions, then get yards, bags, material list, and cost
These pages target common long-tail estimating jobs where a generic cubic-yard answer is not enough. Each page includes an embedded calculator, common size table, bag count, ready-mix order size, and practical buying notes.
Shed base size calculator Shed base size calculator with concrete yards, 80-lb bags, ready-mix order size, gravel base notes, cost assumptions, and common shed slab sizes. Patio concrete calculator Patio concrete calculator for backyard slabs with cubic yards, bag counts, ready-mix order size, 2026 cost assumptions, thickness notes, and common patio sizes. Post hole concrete calculator Post hole concrete calculator for fence posts, deck posts, and round footings with bag counts, cubic yards, cost assumptions, and common post hole sizes. How many bags of concrete for a 10x10 slab? Direct bag-count calculator for a 10x10 concrete slab by thickness: 80-lb, 60-lb, and 50-lb bags, cubic yards, ready-mix comparison, and cost assumptions. Ready-mix vs bagged concrete calculator Ready-mix vs bagged concrete calculator with volume breakpoints, bag counts, cost comparison, delivery notes, short-load fees, and finish-risk guidance.
Direct-answer construction guide
Concrete answers crawlers can read without JavaScript
BuilderCalc.net publishes calculator pages plus scenario-specific answers such as concrete for a 10x10 slab, a 20 foot driveway, deck footings, and stair pours. Each answer includes the exact volume, bag counts, ready-mix order size, cost assumptions, PSI notes, and calculation steps in server-rendered HTML.
Core concrete formulas
- Volume (cubic feet) = Length x width x thickness (in inches / 12).
- Thickness in feet = thickness in inches / 12.
- Volume (cubic yards) = Cubic feet / 27.
- Bags (80-lb) = Cubic feet / 0.60, rounded up.
- Ready-mix order = cubic yards x (1 + waste percent).
Standard PSI by application
| Patio or walkway | 3,000 PSI |
|---|---|
| Garage floor | 3,500 PSI |
| Driveway, cars | 3,500 to 4,000 PSI |
| Driveway, trucks or RVs | 4,000 to 4,500 PSI |
| Foundations or footings | 3,000 to 4,000 PSI, per plan |
Bag yield reference
| 80-lb bag yields | About 0.60 ft3, or 0.022 yd3 |
|---|---|
| 60-lb bag yields | About 0.45 ft3, or 0.017 yd3 |
| 50-lb bag yields | About 0.375 ft3, or 0.0138 yd3 |
| 40-lb bag yields | About 0.30 ft3, or 0.011 yd3 |
Specific concrete answers
Common direct-answer pages
How much concrete for a 10x10 slab (4 inches thick)? Direct answer for a 10 ft by 10 ft by 4 inch concrete slab: cubic yards, bag counts, cost, PSI, and calculation steps. How much concrete for a 8x10 slab (4 inches thick)? Direct answer for a 8 ft by 10 ft by 4 inch concrete slab: cubic yards, bag counts, cost, PSI, and calculation steps. How much concrete for a 12x12 slab (4 inches thick)? Direct answer for a 12 ft by 12 ft by 4 inch concrete slab: cubic yards, bag counts, cost, PSI, and calculation steps. How much concrete for a 20x20 slab (6 inches thick)? Direct answer for a 20 ft by 20 ft by 6 inch concrete slab: cubic yards, bag counts, cost, PSI, and calculation steps. How much concrete for a 30x40 slab (6 inches thick)? Direct answer for a 30 ft by 40 ft by 6 inch concrete slab: cubic yards, bag counts, cost, PSI, and calculation steps. How much concrete for a 20 foot 2-car driveway? Direct answer for a 20 ft by 20 ft driveway slab: cubic yards, 80-lb bags, ready-mix order size, PSI, and cost. How much concrete for 12 inch footings? Direct answer for 8 round 12 inch concrete footings: cubic yards, bag counts, ready-mix order size, and calculation steps. How much concrete for a 4x4 fence post? Direct answer for one 4x4 fence post hole: cubic feet, bag counts, depth assumptions, drainage gravel notes, and common mistakes.
View all concrete answer pages 2026 cost pages
Cost estimates people ask for
How much does a 10x10 concrete slab cost in 2026? How much does a 10x10 concrete slab cost in 2026: 2026 DIY material range, professional installed range, concrete yards, labor, short-load fees, and price factors. How much does a 12x12 concrete slab cost in 2026? How much does a 12x12 concrete slab cost in 2026: 2026 DIY material range, professional installed range, concrete yards, labor, short-load fees, and price factors. How much does a 20x20 concrete slab cost in 2026? How much does a 20x20 concrete slab cost in 2026: 2026 DIY material range, professional installed range, concrete yards, labor, short-load fees, and price factors. How much does a 24x24 garage slab cost in 2026? How much does a 24x24 garage slab cost in 2026: 2026 DIY material range, professional installed range, concrete yards, labor, short-load fees, and price factors. How much does a 2-car concrete driveway cost in 2026? How much does a 2-car concrete driveway cost in 2026: 2026 DIY material range, professional installed range, concrete yards, labor, short-load fees, and price factors.
View all concrete cost pages Regional costs
Concrete slab cost by state
California concrete slab cost in 2026 $7.70-$8.50/sq ft, ready-mix planning value $125/yd3. Texas concrete slab cost in 2026 $5.30-$5.90/sq ft, ready-mix planning value $120/yd3. Florida concrete slab cost in 2026 $5.90-$6.60/sq ft, ready-mix planning value $111/yd3. New York concrete slab cost in 2026 $6.70-$8.50/sq ft, ready-mix planning value $125/yd3. Illinois concrete slab cost in 2026 $4.14-$8.29/sq ft, ready-mix planning value $114/yd3.
View regional cost pages Material answers
Other direct-answer pages
How much gravel for a 10x10 driveway? Direct answer for gravel for a 10x10 driveway area: cubic yards, tons, depth assumptions, waste, compaction notes, and ordering guidance. How much mulch for a 100 sq ft flower bed? Direct answer for mulch for a 100 sq ft flower bed: cubic yards, bags, 2-inch vs 3-inch depth, ordering notes, and common mistakes. How much paint for a 12x12 room? Direct answer for paint for a 12x12 room: wall area, gallons for two coats, ceiling option, coverage assumptions, and buying guidance. How much tile for a bathroom floor? Direct answer for tile for a typical bathroom floor: square footage, 10% waste, box count example, layout notes, and mistakes to avoid.
View material answer pages Concrete guides
Decision guides
How to finish concrete without weakening the surface Concrete finishing guide for screeding, bull floating, edging, jointing, troweling, broom finish, timing, and common mistakes. Concrete curing time: when can you walk, drive, and build on it? Concrete curing time guide for walking, vehicle traffic, 7-day strength, 28-day strength, weather, moisture, and curing decisions. Rebar vs wire mesh for concrete slabs Decision guide for rebar vs wire mesh in concrete slabs: patios, sidewalks, driveways, garage floors, placement, cost, and limitations. How much extra concrete should you order? Concrete overage guide for slabs, footings, post holes, stairs, ready-mix orders, bagged concrete, and when to use 5%, 10%, or 15%. Ready-mix vs bagged concrete: which should you use? Decision guide for ready-mix vs bagged concrete by cubic yards, bag counts, short-load fees, access, labor, timing, and finish risk.
View all concrete guides