How it works
Volume = width × Σ (step number × rise × run) + width × landing depth × total rise.
Example: 2 steps, 7 in rise and 11 in run, 4 ft wide with a 36 in landing, take 20.4 ft³ (0.76 yd³), or 38 bags of 80 lb concrete.
At a glance
Same settings as the calculator above, changing only the width.
| Width | Concrete | Bags |
|---|---|---|
| 3 ft | 15.3 ft³ | 29 |
| 4 ft | 20.4 ft³ | 38 |
| 5 ft | 25.5 ft³ | 47 |
| 6 ft | 30.6 ft³ | 57 |
Bag yields
| Bag | Yield | Bags per yd³ |
|---|---|---|
| 40 lb | 0.30 ft³ | 90 |
| 50 lb | 0.375 ft³ | 72 |
| 60 lb | 0.45 ft³ | 60 |
| 80 lb | 0.60 ft³ | 45 |
Quikrete Concrete Mix product data.
Common questions
What rise and run should steps have?
Many codes limit residential stairs to about a 7¾ in maximum rise and a 10 in minimum tread. Check your local code.
How many bags of concrete for steps?
Divide the volume by the bag yield: 0.60 ft³ for an 80 lb bag. Three 4 ft wide steps with a 3 ft landing take about 11 ft³.
Sources
- Quikrete, Concrete Mix data sheet (bag yields): https://www.quikrete.com/PDFs/DATA_SHEET-Concrete%20Mix%201101.pdf