Concrete Calculator
Calculate concrete needed for slabs, columns, and walls. Get cubic yards, number of bags, and cost estimates. Includes waste factor and common project presets.
| Project | Thickness | PSI Rating |
|---|---|---|
| Sidewalk / Path | 4" | 3,000 |
| Patio / Floor Slab | 4" | 3,500 |
| Driveway (cars) | 4-6" | 4,000 |
| Driveway (heavy vehicles) | 6-8" | 4,500 |
| Foundation / Footing | 6-12" | 4,000+ |
| Retaining Wall | 6-8" | 4,000 |
How to Use Concrete Calculator
- 1Select shape: slab, column, or wall
- 2Enter dimensions
- 3Set waste factor percentage
- 4View cubic yards and bags needed
Frequently Asked Questions
How much concrete do I need?▾
Calculate cubic footage (L×W×depth in feet), then divide by 27 to get cubic yards. A 10×10 ft patio at 4 inches thick needs about 1.24 cubic yards.
How many bags of concrete per cubic yard?▾
A cubic yard requires approximately 60 bags of 60-lb concrete mix or 45 bags of 80-lb mix. For large projects, ordering ready-mix by the truck is more economical.
How thick should a concrete slab be?▾
Sidewalks: 4 inches. Patios: 4 inches. Driveways: 4-6 inches. Garage floors: 4-6 inches. Foundation: 8-12 inches.
About Concrete Calculator
Calculate concrete needed for slabs, columns, and walls. Get cubic yards, number of bags, and cost estimates. Includes waste factor and common project presets.
NexTool's Concrete Calculator is completely free to use with no sign-up required. Your data is processed directly in your browser and never sent to our servers, ensuring complete privacy and instant results.
Related Tools
Stay Updated
Get notified about new tools, features, and exclusive deals. No spam, ever.