Concrete calculator
Enter the dimensions of your pour and get cubic yards, bag counts and an estimated cost.
What you need
4.94 cu yd
- Cubic feet
- 133.33 cu ft
- Cubic metres
- 3.776 m³
- Order this much
- 5.43 cu yd
- 80 lb bags
- 245
- 60 lb bags
- 326
- Weight
- 18,670 lb
- Truckloads
- 1
- Cost
- $850 to $1,150
Common sizes
| Size | Area | Cubic yards | 80 lb bags |
|---|---|---|---|
| 10×10 | 100 cu ft | 1.23 | 62 |
| 20×20 | 400 cu ft | 4.94 | 245 |
| 30×40 | 1,200 cu ft | 14.81 | 734 |
| 20×30 | 600 cu ft | 7.41 | 367 |
| 30×30 | 900 cu ft | 11.11 | 550 |
| 12×12 | 144 cu ft | 1.78 | 89 |
| 40×60 | 2,400 cu ft | 29.63 | 1,467 |
| 30×50 | 1,500 cu ft | 18.52 | 917 |
Concrete calculators
- Slab concrete calculator — Cubic yards and bags for a rectangular slab or pad.
- work out a Yardage pour — The same pour in cubic yards, the way a supplier quotes it.
- Bags concrete calculator — How many bags of each size a pour takes.
- work out a Cost pour — An estimated cost for the pour, with the price you pay.
- concrete for a Premix — Bags of premixed concrete for a pour this size.
- work out a Weight pour — What the finished pour weighs.
- Sonotube concrete calculator — Concrete for round forms, piers and caissons.
- concrete for a Footing — Concrete for a continuous strip footing.
How this is worked out
volume in cubic feet = width in feet × length in feet × thickness in inches ÷ 12
cubic yards = cubic feet ÷ 27
bags = cubic feet with waste ÷ what one bag yields, rounded up
At the dimensions above that is 133.33 cubic feet, which is 4.94 cubic yards.
Where these numbers come from
Bag yields: QUIKRETE Concrete Mix data sheet No. 1101. Price basis: Concrete Financial Insights weighted average selling price for 2025, escalated with U.S. Bureau of Labor Statistics PPI series PCU327320327320 (2026-06). Prices vary by region — enter your own quote above.