Concrete Calculator
Calculate concrete needed for slabs, driveways, and post holes
Project Details
Slab Dimensions
Post Holes (Optional)
Options
Standard waste: 10%
Complex pours: 15-20%
Results
Slab Volume:-- cu ft
Post Holes:-- cu ft
Total Volume:-- cu ft
Cubic Yards:-- cu yd
Bag Options:
40 lb bags:-- bags
60 lb bags:-- bags
80 lb bags:-- bags (recommended)
Ad Space (300×600)
Ad Space (Mobile)
How to Use the Concrete Calculator
This concrete calculator helps you determine the exact amount of concrete needed for slabs, driveways, sidewalks, and post holes. Get results in both cubic yards (for ready-mix orders) and bag counts (for DIY projects).
Typical Projects:
- Sidewalks: 4" thick × desired length × 4' wide
- Driveways: 4-6" thick × length × width
- Patios: 3-4" thick × length × width
- Post holes: Typically 8-12" diameter × 2-3' deep
Bag Size Guidelines:
- 40 lb bags: Easiest to handle, good for small repairs
- 60 lb bags: Good balance of handling and coverage
- 80 lb bags: Most economical for larger projects
Preparation Tips:
- Ensure proper base preparation and compaction
- Use forms to contain the concrete pour
- Have all tools ready before mixing
- Work quickly - concrete begins setting within 30 minutes
Disclaimer: This is an estimator only. Verify requirements with local building codes and concrete suppliers.