Free Concrete Calculator - Instantly Estimate Concrete Needs
Instantly estimate the amount of concrete you need for your slab, footing, or project. Includes expert tips, formulas, and answers to common questions.
Concrete Calculator
Enter your slab dimensions and desired depth to calculate cubic yards needed.
How to Use the Concrete Calculator
Step-by-step guide to accurately calculate concrete needs for any slab or project.
- Measure Area: Measure the length and width of your slab or area in feet.
- Determine Depth: Decide on the depth of concrete in feet (e.g., 0.5 for 6 inches).
- Enter Values: Input the length, width, and depth into the calculator.
- Calculate: Click Calculate to see the cubic yards of concrete needed.
Quick Concrete Answers
Voice search and featured snippet optimized answers
How do I calculate how much concrete I need?
Multiply length × width × depth (in feet), then divide by 27 to get cubic yards.
What is the formula for concrete volume?
Cubic Yards = (Length × Width × Depth) ÷ 27 (all in feet)
How thick should a concrete slab be?
4-6 inches (0.33-0.5 ft) is typical for most slabs.
How much does 1 cubic yard of concrete cover?
1 cubic yard covers 81 sq ft at 4 inches thick.
Concrete Tips
- Order 10% extra concrete to account for spillage and uneven subgrade.
- Double-check your measurements for accuracy.
- Use rebar or mesh for added strength in slabs.
- Concrete sets quickly—have your site ready before delivery.
Frequently Asked Questions
How do I convert inches to feet for depth?
Divide the number of inches by 12. For example, 6 inches = 0.5 feet.
How much concrete do I need for a circular slab?
Use the formula: Area = π × radius². Then use the calculator with your area and desired depth.
What is the best concrete mix for driveways?
A 4000 psi mix with air entrainment is recommended for driveways in cold climates.