Aisha K.
Mar 12, 2026
Clean layout and the results update instantly. Exactly what I needed for a quick planning check.
Construction & Bidding
Concrete Volume Calculator — Cubic Yards & Bags
Cu ft = L × W × (D in ÷ 12); cu yd = cu ft ÷ 27; bags = cu ft ÷ bag yield.
Volume in cu yd and 80 lb bags from slab dimensions. Planning estimates only — verify measurements and local codes on site.
Inputs
1200
1200
224
0.41
220
010000
Smart analysis
Recommendations
Tailored to your live inputs and result—guidance only, not professional advice.
- Interpret
Treat this as a planning estimate
Primary result: Cubic yards = 1.48. Re-run with optimistic and pessimistic inputs to understand the range—not just a single point.
Scenario studio
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Plain-English guide
Terms & how it works
Confused by a field? Read the short definitions here while you use the tool.
Length (ft)
The “Length (ft)” value used in this tool’s formula. Adjust it to see results update live.
Width (ft)
The “Width (ft)” value used in this tool’s formula. Adjust it to see results update live.
Depth (in)
The “Depth (in)” value used in this tool’s formula. Adjust it to see results update live.
Bag yield (cu ft)
The “Bag yield (cu ft)” value used in this tool’s formula. Adjust it to see results update live.
Cost per bag
One-time or recurring costs that affect total money paid.
Labor
One-time or recurring costs that affect total money paid.
- bagCost
Cost per bag ($)
The “Cost per bag ($)” field. Default 5; typical range 2–20.
- laborCost
Labor ($)
The “Labor ($)” field. Default 200; typical range 0–10000.
How this calculator works
Volume in cu yd and 80 lb bags from slab dimensions. Planning estimates only — verify measurements and local codes on site. Cu ft = L × W × (D in ÷ 12); cu yd = cu ft ÷ 27; bags = cu ft ÷ bag yield. Example: 10×12 ft slab, 4 in thick → ~1.48 cu yd, ~22 80 lb bags.
Cu ft = L × W × (D in ÷ 12); cu yd = cu ft ÷ 27; bags = cu ft ÷ bag yield.
Example: 10×12 ft slab, 4 in thick → ~1.48 cu yd, ~22 80 lb bags.
When to use this Concrete Volume
Common use cases
- Volume in cu yd and 80 lb bags from slab dimensions.
- Sanity-check with this case: 10×12 ft slab, 4 in thick → ~1.48 cu yd, ~22 80 lb bags.
- The relationship is: Cu ft = L × W × (D in ÷ 12); cu yd = cu ft ÷ 27; bags = cu ft ÷ bag yield.
Localized examples
- Construction & Bidding: the example on this page uses the same formula as the widget.
What you get
- Fields: Length (ft), Width (ft), Depth (in), Bag yield (cu ft)
- Cu ft = L × W × (D in ÷ 12); cu yd = cu ft ÷ 27; bags = cu ft ÷ bag yield.
- Example on the page: 10×12 ft slab, 4 in thick → ~1.48 cu yd, ~22 80 lb bags.
How to Calculate Concrete Volume Step-by-Step
- 1Enter Length (ft), Width (ft), Depth (in), then the remaining fields. Use the values you have, not a catalog average, unless that is all you know.
- 2Cu ft = L × W × (D in ÷ 12); cu yd = cu ft ÷ 27; bags = cu ft ÷ bag yield.
- 3Worked case: 10×12 ft slab, 4 in thick → ~1.48 cu yd, ~22 80 lb bags.
- 4Buy materials after you walk the job. This is a first-pass quantity, not a purchase order.
Governing formula
Cu ft = L × W × (D in ÷ 12); cu yd = cu ft ÷ 27; bags = cu ft ÷ bag yield.
10×12 ft slab, 4 in thick → ~1.48 cu yd, ~22 80 lb bags.
Example: set Length (ft) = 10, Width (ft) = 12, Depth (in) = 4, then read the result.
Variable definitions
- lengthFt
Length (ft)
The “Length (ft)” field. Default 10; typical range 1–200.
- widthFt
Width (ft)
The “Width (ft)” field. Default 12; typical range 1–200.
- depthIn
Depth (in)
The “Depth (in)” field. Default 4; typical range 2–24.
- bagYieldCuFt
Bag yield (cu ft)
The “Bag yield (cu ft)” field. Default 0.6; typical range 0.4–1.
- bagCost
Cost per bag ($)
The “Cost per bag ($)” field. Default 5; typical range 2–20.
- laborCost
Labor ($)
The “Labor ($)” field. Default 200; typical range 0–10000.
- The takeoff (Cu ft = L × W × (D in ÷ 12); cu yd = cu ft ÷ 27; bags = cu ft ÷ bag yield.) ignores waste, code, and what you find when you open the wall. Measure twice on site.
- Nothing here is uploaded for the calculation itself.
Frequently Asked Questions
Cu ft = L × W × (D in ÷ 12); cu yd = cu ft ÷ 27; bags = cu ft ÷ bag yield.
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Community
Reviews & Ratings
See what others think about this tool, then leave your own rating to help improve CalculioHub.
4.8
out of 5.0
4 reviews
Daniel R.
Feb 28, 2026
Very usable on mobile. Would love a save/export option later, but the math feels solid.
Priya S.
Feb 3, 2026
The FAQ section answered my questions before I even had to search. Smooth dark mode too.
Marcus L.
Jan 19, 2026
Simple inputs, clear outputs. This replaced three bookmarks I used to juggle.
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