Concrete Calculator – Cubic Yards and Concrete Volume
A concrete calculator estimates how much concrete you need for a slab or rectangular area. You enter length (ft), width (ft), and depth (inches). The result is in cubic yards—the usual unit for ordering concrete. This article explains the formula and links to our concrete calculator.
Quick Answer
| Label | Value |
|---|---|
| Length × width | 10 ft × 10 ft |
| Depth | 4 in |
| Cubic yards | 1.23 |
How It Works
Volume (cubic ft) = length × width × (depth ÷ 12). Then cubic yards = cubic ft ÷ 27. For 10×10 ft and 4 in depth: 100 × (4/12) ≈ 33.33 ft³; 33.33 ÷ 27 ≈ 1.23 yd³. Order a bit extra for spill and uneven subgrade.
Additional Notes
Concrete is often ordered in cubic yards. Round up when ordering.
Use Our Calculator
Try our Concrete Calculator for your own numbers: /calculators/concrete-calculator
Related Calculators
Multiply length (ft) × width (ft) × (depth in inches ÷ 12), then divide by 27.
Concrete is typically sold by the cubic yard. 1 yd³ = 27 ft³.
Yes. Add about 5–10% for waste and uneven surfaces.