How to use it
- Enter the cylinder diameter in inches, depth in feet, and quantity.
- Click the Calculate button.
- Read the cubic yards, cubic feet and 80‑lb bag count results.
What it does – The calculator takes the cylinder’s diameter (inches), depth (feet) and quantity, then shows total volume in cubic feet, converts to cubic yards (1 yd³ = 27 ft³) and tells you how many 80‑lb bags you need (each bag ≈ 0.6 ft³). Why it matters – Knowing exact volume prevents over‑ordering, cuts waste, and keeps your budget on track. How to read – Cubic yards is the standard order unit for deliveries, cubic feet helps you verify site measurements, and the bag count tells you how many mix bags to request. You can enter several identical cylinders at once; the calculator multiplies the single‑cylinder volume by the quantity you provide. The results update instantly, so you can experiment with different sizes before you order. This tool works on any device, no download required.
Pro tips
- Add 10% extra for waste to avoid shortfalls
- Round up the bag count to the next whole bag
- Order a few extra bags in case of mix errors
- Double‑check that diameter is in inches and depth in feet
Real-life examples
- Homeowner estimating concrete for a patio column
- Contractor calculating footings for a small shed
- DIY enthusiast planning a decorative concrete post
Case study
Mike needed 4 concrete footings for a new deck. He guessed 30 bags, but the calculator showed 24 bags (≈ 0.6 ft³ each) were enough, saving him $150 and a delivery truck.