Inputs
Advanced options includedTypical: 150 lb/ft³ or 2400 kg/m³.
Results
Total volume
0.000 yd³
0.000 ft³
0.000 m³
Concrete weight
0 lb
0 kg
Bag estimates
40 lb: 0
50 lb: 0
60 lb: 0
80 lb: 0
20 kg: 0
25 kg: 0
30 kg: 0
Rebar weight (if included)
0 lb
0 kg
| Metric | Value |
|---|
Example data table
Typical cases for quick reference. Change inputs above and recalc for your project.
| Diameter (in) | Height (in) | Count | Waste % | Volume (ft³) | Volume (yd³) | 80 lb bags |
|---|
Formula used
Cylinder volume: V = π · D² / 4 · H. Use consistent units for diameter D and height H.
- Imperial: inches → feet:
Dft = Din/12,Hft = Hin/12, soVft³ = π·(Dft²)/4·Hft. - Metric: millimeters → meters:
Dm = Dmm/1000,Hm = Hmm/1000, soVm³ = π·(Dm²)/4·Hm. - Apply waste:
Vtotal = V · count · (1 + waste%). - Bag counts: divide total volume by per‑bag yield and round up.
- Concrete weight:
W = ρ · Vwhere ρ is density in matched units. - Rebar weight: verticals + hoops. Verticals length ≈
H − 2·cover. Hoops count ≈⌊(H−2·cover)/spacing⌋ + 1. Hoop length ≈ circumference at clear diameter.
Per‑bag yields used here: 40 lb → 0.30 ft³, 50 lb → 0.375 ft³, 60 lb → 0.45 ft³, 80 lb → 0.60 ft³; 20 kg → 0.009 m³, 25 kg → 0.012 m³, 30 kg → 0.014 m³. Verify with your supplier.
How to use
- Choose units and enter tube diameter and height/depth.
- Set number of tubes and optional waste percentage.
- Adjust concrete density if required by spec or mix design.
- (Optional) Toggle rebar; set bar size, count, cover, and hoop spacing.
- Click Calculate to see volumes, weights, and bag counts.
- Export your results as CSV or PDF for submittals or procurement.
Note: This tool gives quantity estimates only. Always follow local codes, manufacturer instructions, and engineer guidance for structural design and reinforcement.
FAQs
It depends on diameter and height. The calculator computes exact cylinder volume and adds your waste allowance to estimate total mix required.
No. Published yields vary by brand and aggregate moisture. The defaults are typical references; confirm exact yields on your product datasheet.
Normal‑weight concrete is often approximated at 150 lb/ft³ (2400 kg/m³). Lightweight or heavyweight mixes differ; use your specification value if provided.
The displacement is negligible for typical cages. This tool reports rebar weight separately for estimating steel, not volume removal.
Yes, but most projects include 5–10% to account for spillage, over‑excavation, and mix variability. Adjust to match your site practice.
Yes. Switch to metric to enter millimeters and get results in cubic meters and kilograms, with parallel imperial summaries for convenience.