Concrete Calculator
Calculate how much concrete you need for your project.
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Cubic Feet
80lb Bags Needed
60lb Bags Needed
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Frequently Asked Questions
How much concrete do I need?
Calculate cubic feet (L×W×D in feet), divide by 27 for cubic yards. Add 10% extra for waste.
How many bags of concrete per cubic yard?
About 45 bags of 80lb mix or 60 bags of 60lb mix per cubic yard.
How thick should a concrete slab be?
Sidewalks/patios: 4 inches. Driveways: 6 inches. Garage floors: 4-6 inches. Foundations: per code.
How long does concrete take to cure?
Initial set: 24-48 hours. Walkable: 24 hours. Full strength: 28 days. Keep moist for best results.
Should I order ready-mix or use bags?
For over 1 cubic yard, order ready-mix (truck delivery). For smaller jobs, bags are more practical.