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Cubic Yards Of A Cylinder Calculator

Calculate cubic yards, 80‑lb bags, and cubic feet for any cylinder instantly and free.

  • Free
  • No sign-up
  • Instant results

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How to use it

  1. Enter the cylinder diameter in inches.
  2. Enter the depth/height in feet.
  3. Set the number of identical cylinders you need.
  4. Read the cubic yards, cubic feet, and 80‑lb bag count instantly.

This tool converts a round concrete shape—defined by its diameter and depth—into the three units you order and measure: cubic yards, cubic feet, and the number of 80‑lb bags. Knowing the exact cubic yards tells you how much material to order from the supplier; cubic feet lets you compare to site‑specific calculations; bag count shows the concrete mix you’ll actually buy. For example, a 12‑in diameter cylinder 2 ft deep yields about 1.57 ft³, which is 0.058 yd³ and requires roughly 3 bags (1 bag = 0.6 ft³, round up). Read each result column to plan ordering, budgeting, and on‑site handling without guesswork.

Pro tips

  • Add 5‑10% extra for spillage and settling.
  • Round up the bag total to the next whole bag.
  • Order bags in multiples of 5 for better pricing.
  • Confirm units: diameter in inches, height in feet.

Real-life examples

  • A homeowner pouring a 12‑in round patio pad 4 ft deep.
  • A contractor estimating concrete for multiple drainage culverts.
  • A landscape designer sizing circular flower‑bed bases.

Case study

John needed concrete for three 24‑in diameter, 1.5‑ft deep footings. Using the calculator he saw he required 0.17 yd³ total, which translated to 3 bags of 80‑lb mix. He ordered the exact amount, avoided a half‑bag surplus and saved $30.

Frequently asked questions

How do I convert the calculator result to the number of 80‑lb bags?
Divide the cubic‑feet result by 0.6 (each bag = 0.6 ft³) and round up to the nearest whole bag.
Why does the calculator ask for diameter in inches but height in feet?
Concrete orders are typically quoted in cubic yards, while pipe and pad dimensions are often given in inches for diameter and feet for depth.
Can I use the tool for multiple cylinders at once?
Yes—enter the quantity of identical cylinders and the results will multiply accordingly.
Do I need to include a waste factor?
Add 5‑10% to the bag count to cover spillage, over‑fill, and minor measurement errors.
Is the calculator accurate for large projects?
It uses exact geometric conversion and the standard 0.6 ft³ per 80‑lb bag, so it remains accurate regardless of size; just ensure you apply any project‑specific waste allowances.