Circular Column Calculator

Please check.

Please be sure to check the input units for diameter (D] and height. Mixing units is the main cause of quantity errors.
The calculator is based on diameter. Please be extra careful not to confuse the radius with the diameter when entering values.
Since paper formwork can deform slightly during pouring, it is safer to order with a 5~10% markup.
If the floor is sloped, you must measure the height based on the lowest point to prevent defects where the top of the pillars are exposed.
Since this is based on pure volume, please allow a margin of about 0.5 cubic meters when placing the final order, taking into account the remaining volume of the pump truck and losses.

How about this calculator?

Round Column Calculator, Complete Guide to Calculating Concrete Mules (㎥] and Pouring Volume

It instantly calculates the cubic meter value based solely on diameter, height, and quantity, improving the accuracy of ready-mix concrete orders.

cylindrical concrete quantity calculation formula

When calculating the volume of a circular column or foundation, it is determined by multiplying the square of the radius by pi (π] and the height. Since the diameter (D] is primarily measured on-site, the process of converting it to the radius (R] is important.

1. Calculation of Circular Cross-sectional Area

Cross-sectional area (m²] = Radius (r] × Radius (r] × 3.14 (π]

First, calculate the area of the top or bottom surface of the column. If the diameter is 1,000 mm, substitute the radius 0.5 m.

2. Calculation of Total Volume

Volume (㎥] = Cross-sectional area × Height (H]

The total amount of concrete is calculated by multiplying the obtained cross-sectional area by the total height (or embankment depth] of the column.

3. Final Order Quantity (Markup Reflected]

Order Quantity = Volume (㎥] × (1 + Markup Rate]

Usually, a margin of 5 to 10 percent is added to account for slight gaps in the circular formwork or pouring loss.

Detailed Guide to Calculator Input Items

Please enter the inner diameter of the column and the actual pouring height for accurate calculation.

1. Enter diameter
Please enter the widest width of the circular structure. This is based on the diameter, not the radius.
2. Height/Depth
Enter the vertical height to be filled with concrete. If it is a landfill foundation, it is based on the excavation depth.
3. Number of pillars
If there are multiple columns of the same size, enter the number to calculate the total quantity at once.
Set surcharge rate
Enter between 3% and 10% depending on site conditions. It is recommended to allow a little more margin when using a concrete pump.

Required quantity by standard specifications for circular bases (Example]

This is the approximate amount of concrete required (cubic meters] based on diameter and a standard height of 1,000 mm (1 m].

Column diameter (D]	Cross-sectional area (㎡]	Required volume (㎥/m]	concrete.column.table.th4
300mm	0.071	약 0.07	Wall foundation, small support
500mm	0.196	약 0.20	Independent foundations for general buildings
800mm	0.503	약 0.50	Foundations for heavy structures
1,000mm	0.785	약 0.79	Large bridge piers, special foundations

note.

Although formwork installation is more difficult for circular columns compared to square columns, they have the advantage of uniform load distribution.

Essential Checklist for Fail-Free Construction

Here are practical field tips to reduce errors during circular pouring.

Caution: Confusion between radius and diameter
Field measurements are often taken in diameter (D], so please be sure to check the units when entering data.
Maintain verticality
Regularly check the verticality before and after pouring using a plumb bob or laser level.
Sealing the bottom of the formwork
If cement water leaks from the bottom, it causes material loss and a decrease in strength.
Use a vibrator
Circular structures are relatively easy to pour because they have no corners, but if the rebar density is high, sufficient vibration must be applied to prevent internal voids from forming.

Frequently Asked Questions (FAQ]

Q. How much ready-mix concrete is required for one column with a diameter of 600mm and a height of 2m?
A. Radius 0.3m x 0.3m x 3.14 x 2m = approximately 0.56 cubic meters is required.

Q. What is commonly used for circular molds?
A. Disposable paper formwork (void form] or spiral ducts are cut to size and used.

Q. Can I use this calculator even though the foundation pit is not circular?
A. If the excavation surface is irregular, calculating based on the widest diameter or using a 'cubic meter calculator' by assuming it is rectangular is a way to prevent shortages.