Concrete Volume Calculator
Enter length, width and depth in any unit — feet, inches, yards, meters or centimeters — and this concrete volume calculator converts the pour into cubic feet, cubic yards, bags and cost at once.
Concrete needed
0.00 yd³
0.0 ft³
Estimated cost
$0
at $165 per yd³
Approx. weight
6 lb
≈ 0.0 tons
Bagged mix
1
80-lb bags
1
60-lb bags
1
40-lb bags
Before you order: add about 10% for uneven subgrade and spillage — that's 0.00 yd³ or 1 × 80-lb bags.
Formula
All dimensions go to one unit, then volume is length × width × depth:
cubic yards = cubic feet ÷ 27 cubic meters = cubic feet ÷ 35.31 bags (80-lb) = cubic feet ÷ 0.60
Common conversions: 1 yd³ = 27 ft³ = 0.765 m³; 1 m³ = 35.31 ft³ = 1.31 yd³; 1 in of thickness = 0.0833 ft.
Example
- A footing pad 4 ft × 3 ft × 6 in deep: 6 ÷ 12 = 0.5 ft.
- Volume: 4 × 3 × 0.5 = 6 ft³ = 0.22 yd³ = 0.17 m³.
- Bags: 6 ÷ 0.60 = 10 × 80-lb bags — a true wheelbarrow job.
- Cost at $165 per yard: 0.22 × 165 ≈ $37.
Frequently Asked Questions
How do I calculate concrete volume?
Multiply length × width × depth in the same unit to get cubic units, then convert: cubic feet ÷ 27 = cubic yards; cubic feet × 0.0283 = cubic meters. The calculator accepts each dimension in ft, in, yd, m or cm and does every conversion for you.
How many cubic feet are in a cubic yard?
27. A cubic yard is a 3 × 3 × 3 ft cube. Ready-mix is sold in cubic yards, bagged mix in cubic-foot yields (an 80-lb bag makes 0.60 ft³), and most DIY plans are measured in feet — the conversions are where mistakes happen.
Can I use meters and centimeters?
Yes — set the unit selector to m or cm and the result shows cubic meters alongside cubic feet and yards. One cubic meter is 35.31 ft³, or about 1.31 cubic yards, and weighs roughly 2.13 metric tonnes of wet concrete.
What about round or odd-shaped pours?
Break the shape into rectangles, run each through the calculator, and add the results. For round piers and tubes, the sonotube calculator does the cylinder math directly.