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Concrete Yard & Bag Calculator
Calculate volume, bags, and cost
Calculate concrete volume for slabs, footings, and columns in cubic yards or cubic meters. Compare bags vs ready-mix cost.
Estimate Your Concrete Cost in Minutes
Calculate concrete volume, bag count, and total project cost for slabs, footings, or columns before you order materials.
Common calculations
- Driveway pouring
- Patio slab
- Fence post footings
You will get
- Total cubic yards needed
- Bags vs Truck comparison
- Estimated project cost
Quick Result
Volume Needed
1.23 Cu. Yards
Recommend Bags ($336.00)
Based on
- • Type: Slab
- • Quantity: 1
- • Size: 10x10 ft
Dimensions
Cost Settings
Volume Needed
Ideally order 1.3 Cu. Yards (+5% waste).
Recommendation
Use Bags
Small enough to mix manually
DIY with Bags$336.00
Using 80lb bags. Total weight: 4480 lbs.
Warning: Mixing this manually requires significant labor.
Ready Mix Truck$300.00
Most companies have a 1-yard minimum charge ("short load fee").
Pro: Consistent mix, saves back-breaking labor.
Pouring Success Tips
Disclaimer: This tool is for informational and planning purposes only and does not constitute professional financial, construction, or safety advice. Actual costs, ROI, and material requirements may vary significantly based on location, market conditions, and site specifics. Construction projects involve inherent safety risks; always follow local building codes, use appropriate safety gear, and consult with licensed professionals (engineers, electricians, contractors) for complex or structural work. The creators of this tool are not liable for project outcomes, injuries, or financial losses.
Methodology and Trust
Formulas
Slab Volume
Length * Width * Thickness
Column Volume
π * Radius² * Height
Total Volume
Volume * Quantity
Bags Needed
Total Volume / Bag Volume
Recommended Next Steps
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Concrete 101: Liquid Stone
Key Insights & Concepts
Concrete is the foundation of modern construction. It is a mixture of cement (the glue), aggregate (gravel/sand), and water. When these mix, a chemical reaction called hydration occurs, turning the paste into stone.
In 2026, sustainable concrete mixes (using fly ash or slag to reduce carbon footprint) are becoming standard. Fiber-reinforced mixes are also reducing the need for wire mesh in driveways.
The "Rule of 2"
If your project requires more than 2 cubic yards (1.5 m³) of concrete, order a truck.
- The Math: 2 yards = 90 bags (80lb each). That is 7,200 lbs (3,200 kg) of material you have to lift, mix, and pour.
- The Risk: By the time you mix bag #90, bag #1 has already started to set. You get a "cold joint," which is a structural weakness.
PSI Explained
Not all concrete is the same strength.
Standard (2500-3000 PSI)
Good for walkways, patios, and footings. This is what you get in a standard "Quikrete" bag.
High Strength (4000-5000 PSI)
Required for driveways (to hold vehicle weight) and cold climates (to resist freeze-thaw cycles).
Temperature Matters
Concrete is a chemical reaction sensitive to heat.
- Too Cold (<40°F / 4°C): The reaction stops. The water freezes and expands, shattering the matrix. Use "accelerators" or heated blankets.
- Too Hot (>90°F / 32°C): The water evaporates before it reacts. The surface cracks (plastic shrinkage). Use "retarders" or pour at dawn.