Concrete Calculator
Calculate how much concrete you need for slabs, footings, columns, and stairs
Project Details
Typical: 4 inches for residential slabs
Number of slabs
Concrete Volume
0
cubic yards
0 cubic meters
0 cubic feet
Bags Needed (with 10% waste)
40 lb Bags
0.011 cu yd per bag
60 lb Bags
0.017 cu yd per bag
80 lb Bags
0.022 cu yd per bag
Ready-Mix vs Bags
Use Bags: Projects under 1 cubic yard, small repairs
Use Ready-Mix Truck: Projects over 1 cubic yard - more economical and faster
For 0 cubic yards: Bags are practical
Pro Tips
- • Order 5-10% extra concrete for waste
- • Have helpers ready - concrete sets quickly
- • Prepare forms and reinforcement beforehand
- • Check weather - avoid pouring in freezing temps
- • Rent a concrete mixer for 10+ bags
Concrete Basics
Mix Types
Standard Mix
General purpose - driveways, patios, walkways. 3000-3500 PSI
High-Strength Mix
Structural applications - foundations, columns. 4000-5000 PSI
Rapid-Set Mix
Quick repairs - sets in 20-40 minutes. For small patches
Crack-Resistant Mix
Contains fibers - reduces cracking in slabs and floors
Curing & Strength
Proper curing is essential for concrete strength. The longer concrete stays moist, the stronger it becomes.
24 hours: Safe to walk on (light foot traffic)
7 days: Reaches ~70% of final strength
28 days: Reaches full design strength
Curing Methods
- • Keep surface moist by spraying water
- • Cover with plastic sheeting
- • Use curing compound spray
- • Keep covered for at least 7 days
Important Considerations
Before You Pour
- • Check local building codes and permits
- • Compact and level the subgrade
- • Install proper gravel base (4-6 inches)
- • Add rebar or wire mesh for reinforcement
- • Build sturdy forms to hold concrete
- • Have all tools and helpers ready
During & After
- • Work quickly - concrete starts setting
- • Use a vibrator to remove air pockets
- • Finish surface before it sets too much
- • Cut control joints to prevent cracks
- • Start curing immediately after finishing
- • Protect from freezing for first 24-48 hours
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