The free concrete calculator and cost estimator for volume, bags, and price — updated with 2026 ready-mix pricing. Engineer-reviewed formulas trusted by contractors and DIYers.
Estimate total dollar cost for your pour — material, delivery & finishing, by region
📊 Estimated Project Cost
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Cubic Yards Needed
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Material Cost
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Labor / Finishing
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Total Estimated Cost
2026 pricing note: National ready-mix averages run roughly $125–$175 per cubic yard for material, with tariffs and cement-supply costs pushing prices up 3–7% versus 2025. Installed cost (material + labor + finishing) typically lands between $4–$8 per square foot for a standard broom-finish slab, and $12–$20 per square foot for stamped or decorative concrete. Always confirm current pricing with local ready-mix suppliers — this estimator gives a planning-stage ballpark, not a quote.
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Concrete Slab Calculator
Calculate concrete needed for driveways, patios, floors & any rectangular slab
📊 Concrete Slab Results
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Cubic Yards (yd³)
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Cubic Meters (m³)
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Cubic Feet (ft³)
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60 lb Bags
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80 lb Bags
Pro Tip: Always order 5–10% extra concrete to account for waste, spillage, and uneven subgrade. Standard residential slabs are 4″ thick; garage floors and driveways may need 5–6″.
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Concrete Footing Calculator
For continuous strip footings, foundation footings & perimeter walls
📊 Footing Results
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Cubic Yards (yd³)
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Cubic Meters (m³)
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Cubic Feet (ft³)
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60 lb Bags
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80 lb Bags
Engineer Note: Footings must extend below the frost line in cold climates. Minimum footing width is typically 12″ for residential construction per ACI 318 code. Minimum depth: 6″ for most footings.
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Round Column / Pier Calculator
For circular columns, piers, fence posts & cylindrical pours
📊 Column Results
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Cubic Yards (yd³)
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Cubic Meters (m³)
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Cubic Feet (ft³)
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60 lb Bags
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80 lb Bags
Formula: Volume = π × (diameter/2)² × height. For deck footings, diameter is typically 8–12″ and depth must be below frost line.
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Concrete Wall Calculator
For poured concrete walls, retaining walls & foundation walls
📊 Wall Results
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Cubic Yards (yd³)
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Cubic Meters (m³)
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Cubic Feet (ft³)
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60 lb Bags
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80 lb Bags
Standard wall thicknesses: Basement walls: 8–10 in | Retaining walls: 8–12 in | Interior walls: 6 in. Add 10% for waste.
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Concrete Stairs Calculator
Calculate concrete volume for poured concrete steps & staircases
📊 Stair Results
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Cubic Yards (yd³)
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Cubic Meters (m³)
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Cubic Feet (ft³)
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60 lb Bags
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80 lb Bags
IRC Code: Standard stair rise: 7–7¾ in | Standard run: 10–11 in. A 6″ base slab under stairs is standard. Always consult local building codes.
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Concrete Bag Calculator
How many bags of concrete do you need? Enter your volume or dimensions
📊 Bag Results (with waste factor)
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40 lb Bags
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50 lb Bags
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60 lb Bags
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80 lb Bags
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Total yd³ (w/ waste)
Bag Yield Reference
Bag Size
Yield (ft³)
Yield (yd³)
Bags per yd³
Coverage @ 4″ thick (ft²)
40 lb
0.30
0.011
90
~1.1 ft²
50 lb
0.375
0.0139
72
~1.4 ft²
60 lb
0.45
0.0167
60
~1.7 ft²
80 lb
0.60
0.0222
45
~2.2 ft²
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Curb & Gutter Calculator
Standard AASHTO curb & gutter or custom cross-section
📊 Curb & Gutter Results
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Cubic Yards (yd³)
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Cubic Meters (m³)
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Cubic Feet (ft³)
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80 lb Bags
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Sonotube / Tube Form Calculator
For deck posts, fence posts & concrete tube form fills
📊 Sonotube Results
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Cubic Yards (yd³)
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Cubic Feet (ft³)
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60 lb Bags
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80 lb Bags
Common Sonotube Sizes — Volume per Linear Foot
Diameter
ft³ / ft depth
yd³ / ft depth
80 lb Bags / ft
6 in
0.196
0.0073
0.33
8 in
0.349
0.0129
0.58
10 in
0.545
0.0202
0.91
12 in
0.785
0.0291
1.31
14 in
1.069
0.0396
1.78
16 in
1.396
0.0517
2.33
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Concrete Volume Converter
Convert between cubic yards, cubic feet, cubic meters & liters
Engineer-verified formulas used by professionals worldwide
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Enter Dimensions
Input length, width, and depth/thickness of your concrete project in feet/inches or metric units.
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We Calculate Volume
Our calculator uses ACI-standard formulas to compute the exact cubic volume of concrete required.
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Get Bag Count
We automatically convert volume to the number of 40, 60 or 80 lb bags you need to purchase.
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Order with Confidence
Results include a 10% waste buffer recommendation, so you never run short on a pour day.
Concrete Reference Tables
Expert data for accurate project planning
Standard Concrete Slab Thickness by Application
Application
Min. Thickness
Recommended
PSI Strength
Sidewalk / Walkway
3.5 in (89 mm)
4 in (100 mm)
3,000–3,500 PSI
Residential Patio
3.5 in (89 mm)
4 in (100 mm)
3,000–3,500 PSI
Driveway
4 in (100 mm)
5–6 in (125–150 mm)
4,000 PSI
Garage Floor
4 in (100 mm)
5–6 in (125–150 mm)
4,000 PSI
Basement Floor
3.5 in (89 mm)
4 in (100 mm)
3,500–4,000 PSI
Commercial Floor
5 in (125 mm)
6 in (150 mm)
4,000–5,000 PSI
Heavy Equipment Slab
6 in (150 mm)
8 in (200 mm)
4,500–5,000 PSI
Concrete Weight & Cost Estimates
Measurement
Weight / Value
Notes
1 cubic yard (yd³)
≈ 4,050 lbs (1.84 tonnes)
Standard 3,000 PSI mix
1 cubic foot (ft³)
≈ 150 lbs (68 kg)
Varies with mix design
1 cubic meter (m³)
≈ 2,400 kg (2.4 tonnes)
Normal weight concrete
Ready-mix truck
8–10 yd³ per load
Typical drum truck capacity
Ready-mix average cost (2026)
$125–$175 per yd³
Material only; national average, up 3–7% vs. 2025
Installed cost (2026)
$4–$8 per ft²
Material + labor + finishing, standard broom finish
Pump surcharge
+$15–$25 per yd³
When pump truck is needed
Short-load fee
$75–$125
Applies to orders under 3–4 yd³
2026 Concrete Prices by Region
Ready-mix material cost per cubic yard — national averages, updated for 2026
Region
Typical Price / yd³
Notes
Midwest
$120–$150
Generally lowest cost region
South / Texas
$110–$165
Competitive pricing, many suppliers
National Average
$130–$165
Material only, delivered
West Coast / California
$165–$200+
Higher labor & regulatory costs
Northeast / NYC Metro
$180–$250
Highest-cost metro markets
Why prices vary: Cement supply, diesel/transportation costs, labor rates, and local demand all move concrete pricing. Get at least three itemized quotes from local ready-mix suppliers before ordering — the estimator above is a planning tool, not a binding price.
Who Reviews This Data
Formulas and pricing on this page are maintained by the ConcreteCalculatorz editorial team and technically reviewed by Mark Solano, P.E., a licensed structural engineer with two decades of experience in residential and light-commercial concrete design. Volume formulas follow ACI 318 and IRC 2021 standards; pricing figures are cross-checked against current ready-mix supplier data each quarter.
Page last reviewed and updated: August 16, 2026. Have a correction or a calculator you’d like added? Contact us.
Pro Tips From Engineers
Best practices for every concrete project
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Always Order 5–10% Extra
Account for spillage, subgrade irregularities, and over-excavation. Running short on pour day is costly.
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Temperature Matters
Don’t pour concrete below 40°F (4°C) or above 90°F (32°C) without special precautions. Cure time doubles in cold weather.
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Control Water-Cement Ratio
Keep w/c ratio between 0.40–0.55. Adding extra water reduces strength significantly — every 1 gallon per yd³ reduces strength ~200 PSI.
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Use Control Joints
Saw-cut or form control joints every 8–12 ft in slabs to control cracking. Joints should be ¼ the slab depth.
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Prepare Your Subbase
Compact granular fill to 95% proctor density. A 4″ compacted gravel base prevents slab settlement and cracking.
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Cure Properly
Keep concrete moist for at least 7 days. Use curing compound, wet burlap, or plastic sheeting. Concrete reaches full strength at 28 days.
Frequently Asked Questions
Most asked questions about concrete calculators, mixes & projects
Multiply the length × width × thickness (all in the same unit, e.g., feet). This gives you cubic feet. Divide by 27 to get cubic yards. For example, a 10×10 ft slab at 4 inches (0.333 ft) thick = 10 × 10 × 0.333 = 33.3 ft³ ÷ 27 = 1.23 yd³. Always add 5–10% for waste.
A 10×10 ft slab at 4″ thick requires approximately 1.23 cubic yards (33.3 ft³) of concrete. At 6″ thick, you’ll need 1.85 yd³. Always add 5–10% overage. That’s roughly 56–83 bags of 80 lb concrete at 4″ thickness.
An 80 lb bag of concrete mix yields approximately 0.60 cubic feet. Since 1 cubic yard = 27 cubic feet, you need 27 ÷ 0.60 = 45 bags of 80 lb concrete per cubic yard. For 60 lb bags (0.45 ft³ yield), you need 60 bags per cubic yard.
For residential driveways, use 4,000 PSI (28 MPa) concrete with a 5–6 inch thickness. In freeze-thaw climates, specify air-entrained concrete (5–7% air content) for added durability. Higher traffic driveways may need 4,500–5,000 PSI.
The most common mix ratios are: 1:2:3 (1 part cement : 2 parts sand : 3 parts aggregate) for general structural work, and 1:1.5:3 for higher-strength applications. The water-to-cement ratio is typically 0.45–0.55. Pre-blended bags already include these proportions — just add water per bag instructions.
Concrete achieves approximately 70% of its design strength at 7 days and reaches full design strength (100%) at 28 days. You can walk on it after 24–48 hours and drive on it after 7 days under normal conditions. However, proper curing (keeping it moist) for the full 7 days dramatically improves final strength.
Standard thickness recommendations: Sidewalks & patios: 4 inches | Driveways: 5–6 inches | Garage floors: 5–6 inches | Basement floors: 4 inches | Commercial slabs: 6+ inches. For very heavy loads (forklifts, heavy trucks), consult a structural engineer for a designed slab.
Cement is an ingredient — a fine powder made from limestone, clay, and other minerals. Concrete is the final product made by mixing cement with water, sand (fine aggregate), and gravel (coarse aggregate). Cement makes up roughly 10–15% of concrete by volume. You pour concrete, not cement.
Use the formula: Volume = π × r² × h, where r = radius (diameter ÷ 2) and h = height/depth. All units must match. Example: 12″ diameter (0.5 ft radius) × 4 ft deep = π × 0.25 × 4 = 3.14 ft³ ÷ 27 = 0.116 yd³. Our column calculator above handles this automatically.
A typical residential concrete slab costs $4–$8 per square foot installed (2026 prices), including labor, materials, formwork, and finishing. Plain gray concrete is on the lower end; decorative, stamped, or colored concrete can reach $15–$20/ft². Ready-mix concrete alone runs $125–$175 per cubic yard, varying by region and mix design.
For most residential slabs (patios, sidewalks), 6×6 welded wire mesh (WWM) or #3 rebar at 18″ on center is standard. Driveways, garage floors, and structural slabs typically require #4 rebar at 12–18″ on center both ways. Rebar doesn’t prevent cracking but holds cracks together, maintaining load transfer.
Bagged concrete (hand or mixer) is practical for projects under 1 cubic yard (27 ft³). For anything larger, ordering ready-mix concrete from a local batch plant is more economical and ensures consistent quality. Ready-mix minimum orders are typically 1 yard; short-load fees apply below 5–7 yards. Large projects (10+ yards) almost always require a ready-mix truck.
Ready-mix concrete material costs roughly $125–$175 per cubic yard nationally in 2026, with delivered-and-installed pricing (material plus labor and finishing) typically running $200–$400 per yard depending on region and project complexity. Prices are up 3–7% versus 2025 due to cement supply and transportation costs. Use the Cost Estimator above for a project-specific figure.
A concrete calculator converts your project dimensions into a volume — cubic yards, cubic feet, or bag count. A concrete estimator goes a step further and attaches a dollar figure to that volume using current regional pricing, so you can budget before you call a supplier. This page includes both: use the calculators for exact volume and bags, and the Cost Estimator at the top for a price ballpark.
About Our Concrete Calculator
ConcreteCalculatorz.com provides the most comprehensive collection of free concrete calculators on the internet. Whether you’re a homeowner planning a backyard patio, a contractor bidding a driveway, or an engineer designing a foundation, our calculators give you fast and accurate results based on industry-standard ACI (American Concrete Institute) formulas.
All results are provided in both Imperial (cubic yards, cubic feet, bags) and Metric (cubic meters, liters) units. Our calculators cover every common pour type: concrete slabs, footings, round columns, walls, stairs, curb & gutter, sonotubes, and more — plus a universal concrete volume converter.
Every calculator includes a waste factor recommendation and bag count conversions for 40 lb, 60 lb, and 80 lb premix bags. Our reference tables and pro tips are sourced from ACI 318, IRC 2021, and practicing structural engineers to ensure you get code-compliant results every time.
Engineer Nazim is an engineer dedicated to breaking down complex structural and concrete problems into practical, actionable data for DIYers, contractors, and construction experts. From concrete calculations to field guide logistics, he focuses on real-world solutions that work on-site.
