Free Concrete Calculators
Calculate Concrete for Any Project
Cubic yards, bag counts, block quantities, and project costs — all the concrete calculators you need, free and instant.
All Concrete Calculators
Free, Fast, Accurate
Every calculator on YardageCalc.com is free with no signup required. Results are instant — enter your dimensions and get cubic yards, bag counts, and cost estimates in seconds.
All calculators include a waste factor to prevent running short on pour day. You can adjust this percentage up or down based on your project's complexity.
Built for Contractors & DIYers
Whether you're a professional estimating a commercial pour or a homeowner calculating bags for a backyard patio, these tools give you the numbers you need quickly, without navigating confusing spreadsheets or charts.
All calculations use industry-standard formulas and are updated for current material specifications.
Concrete Quick Reference
| Slab Size | 4" Thick | 5" Thick | 6" Thick | 80lb Bags (4") |
|---|---|---|---|---|
| 10×10 | 1.2 yd³ | 1.5 yd³ | 1.9 yd³ | 56 bags |
| 12×12 | 1.8 yd³ | 2.2 yd³ | 2.7 yd³ | 80 bags |
| 16×16 | 3.2 yd³ | 4.0 yd³ | 4.7 yd³ | 142 bags |
| 20×20 | 5.0 yd³ | 6.2 yd³ | 7.4 yd³ | 222 bags |
| 24×24 | 7.1 yd³ | 8.9 yd³ | 10.7 yd³ | 320 bags |
| 30×40 | 14.8 yd³ | 18.5 yd³ | 22.2 yd³ | 667 bags |
All figures include 10% waste factor. Use the calculators above for precise estimates.