Estimate concrete for round columns, piers, and tube forms. Enter inside diameter, filled height, quantity, and waste to get cubic feet, cubic yards, 60 lb bags, and 80 lb bags.
3 round columns, 18 in inside diameter x 8 ft filled height
Bell bottoms, flared bases, reinforcement, anchor bolts, form bracing, structural loads, soil, frost depth, inspections, and code requirements are outside this material estimate.
Recent concrete column estimates will appear here.
Concrete column estimates stay local. This is material volume math, not structural design approval.
Inputs and recent answers stay in this browser tab and are not sent to a server.
Estimate concrete for round tube forms.
Compare 12-inch, 16-inch, and 18-inch pier sizes.
Plan bag counts for small column pours.
Add waste before pricing ready-mix or bagged concrete.
46.65 ft3, about 1.73 yd3, 78 eighty-pound bags
10.18 ft3, about 0.38 yd3, 17 eighty-pound bags
14.14 ft3, about 0.52 yd3, 24 eighty-pound bags
7.33 ft3, about 0.27 yd3
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Plain-language answers about when to use the tool, what it does with your inputs, what to double-check, and how privacy works.
Use it when your task matches one of these common needs: Estimate concrete for round tube forms. Compare 12-inch, 16-inch, and 18-inch pier sizes. It works best when you already know the measurements, amounts, units, or options the page asks for.
In plain language: The calculator converts inside diameter from inches to feet, divides by two for radius, uses pi times radius squared times filled height, multiplies by quantity, adds waste, converts to cubic yards, and rounds bag counts up. The examples on the page are there so you can compare your inputs with a worked example before copying the answer.
Inside diameter: the clear width across the inside of the round tube or form, measured in inches. Filled height: the height of concrete inside the form, measured in feet. Quantity: how many matching round columns or piers are included. Waste percent: extra concrete for form variation, spillage, overfill, and ordering cushion.
Read the headline estimate first, then check the material, waste, coverage, and unit lines. For project tools, the supporting lines are often the difference between a rough idea and a list you can actually shop from.
This is material volume math only. Footing bells, flared bases, reinforcement, anchors, structural loads, form bracing, vibration, soil, frost depth, inspections, and local code can change the real pour. Also check the unit, scale, mode, and result limit because small input changes can change the answer.
Diameter is the full width across the round form. The calculator divides it by two to get radius, then uses the cylinder formula. Do not enter radius in the diameter box.
No. It estimates the straight round column only. If your pier has a widened base, calculate that extra concrete separately or ask the designer for the takeoff.
One 18 inch diameter column filled 8 feet high is about 14.14 cubic feet before waste. Three matching columns with 10% waste need about 46.65 cubic feet, or 1.73 cubic yards.
Using the default 10% waste setting, three 18 inch by 8 foot round columns need about 78 eighty-pound bags. Bag yields vary, so check the bag label before buying.
Enter the inside diameter because concrete fills the empty space inside the form. If a product lists both sizes, use the inner size or the finished column diameter.
No. This page is for round columns and piers. For a square or rectangular column, multiply length by width by height or use the regular Concrete Calculator with those dimensions.
No. It only estimates concrete volume. Reinforced concrete column design needs loads, rebar, ties, concrete strength, footing details, and local code review.
You cannot buy part of a bag, and shorting a column pour is painful. The calculator rounds 60 lb and 80 lb bag estimates up after adding the waste percent.
Small pours often use 5% to 10% waste for small spills, uneven height, and form variation. Use more if the forms are rough, the ground is uneven, or the pour will be hard to control.
No. It estimates concrete only. Anchor bolts, rebar cages, ties, bracing, vibration, and finishing are separate planning items.
Only for the straight round concrete volume. Deck pier size, depth, rebar, uplift, frost protection, and inspection rules can be code-sensitive, so use the approved plan for the actual dimensions.
No. The calculator runs in your browser tab. Your recent answers stay only on the page while you use it, and they are not sent to a server.