Concrete Volume Calculator
Frequently Asked Questions
How much concrete do I need?
The amount of concrete depends on your project type:
- Slabs: Length x Width x Thickness
- Columns: π x Radius² x Height
- Stairs: Sum of each step volume plus platform
Should I add extra for waste?
Yes, it's recommended to order 5-10% extra concrete to account for:
- Spillage during pouring
- Uneven subgrade
- Form movement or leakage
- Over-excavation
Bags vs. Ready-mix concrete?
Choose based on project size:
- Under 1 cubic yard: Bagged concrete is cost-effective
- Over 1 cubic yard: Ready-mix delivery is usually cheaper and faster
- Consider access to your site for delivery trucks
What is the weight of concrete?
Standard concrete weighs approximately:
- 150 lbs per cubic foot
- 4,050 lbs per cubic yard
- 2,400 kg per cubic meter