Concrete Cylinder Calculator

Concrete Cylinder Calculator for Columns and Test Specimens

The Concrete Cylinder Calculator finds concrete volume, weight, bag count, and mix material volumes for cylindrical pours. Use it for round columns, Sonotube footings, balusters, or compressive strength test cylinders before batching or ordering materials.

Cylinder volume formula

The volume of a single concrete cylinder is:

$$V = \frac{\pi \times d^2 \times h}{4}$$

where $d$ is diameter and $h$ is height. Multiply by the number of cylinders and apply a waste factor for spillage during placement.

Mix material breakdown

When mixing on site, divide total volume by the sum of mix ratio parts. For a 1:1.5:3 mix, cement is one part, sand is 1.5 parts, and gravel is three parts. This helps batch test cylinders to a target compressive strength.

Frequently Asked Questions

How much concrete for a 4 inch by 8 inch test cylinder?

A standard 4 inch diameter, 8 inch tall cylinder holds about 100.5 cubic inches of concrete, or roughly 0.058 cubic feet per specimen.

What mix ratio is used for 2900 psi test cylinders?

A 1:1.5:3 cement:sand:gravel ratio typically targets about 20 MPa (2900 psi) compressive strength when properly cured.

How do I calculate concrete for multiple round columns?

Calculate volume for one cylinder, multiply by the column count, then add 5% to 10% waste. This tool does all three steps automatically.

Can this calculator estimate rebar for cylinders?

No. This tool focuses on concrete volume and mix quantities. For reinforced round columns, use a rebar calculator alongside this estimate.

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