๐๏ธ Calculate Concrete the Right Way
Running out of concrete mid-pour is a contractor's nightmare โ and it ruins the finish. Order 5โ10% more than you think you need, and use this calculator to get the volume right the first time.
๐ Concrete Volume Formulas
- Slab: Length ร Width ร Thickness
- Footing: Length ร Width ร Depth
- Column: ฯ ร Radiusยฒ ร Height
- 1 cubic yard = 27 cubic feet = 46,656 cubic inches
๐ฆ Bag Yield (Quikrete / Sakrete)
| 40 lb bag | 0.30 cu ft |
| 60 lb bag | 0.45 cu ft |
| 80 lb bag | 0.60 cu ft |
๐ง Water Content
- Add ~3 quarts of water per 80 lb bag
- Target slump for slabs: 4โ5 inches
- Too much water weakens concrete โ resist the urge to make it "easier to pour"
โ ๏ธ Order Ready-Mix When Possible
Any pour over 1 cubic yard is more economical with ready-mix delivered by truck. Bagged concrete is best for small jobs (fence posts, small footings, patches).