Spike's Calculators

Columns need to be supported by footings. In some cases, this can be the same footings that support your foundation walls, but more often or not, they are on a separate footing, also known as a pad. For round columns, these pads usually are square.

To calculate the volume for a column plus pad, you need the diameter and height of the column plus the length of one of the sides and the depth of the pad.

- enter the number of columns and pads required
- diameter of the column in millimetres
- the height of the column(s)
- length of one side of the pad in metres
- depth of pad (thickness) in millimetres

- amount of concrete needed in cubic meters
- converted into cubic yards
- concrete needed in feet

V = π * D² ÷ 4 * h * n

pad

V = w² * d * n

where V = volume π = 3.14159 D = diameter h = height of the column w = pad length d = pad thickness n = number of pads and columns

column diameter = 254 millimetres = 0.254 metres column height = 1.5 metres pad size = 0.7 metres x 0.7 metres thickness of pad = 254 millimetres = 0.254 metres 5 columns and pads

Calculating the volume of the columns using the above formula:

3.14159 * 0.254² ÷ 4 * 1.5 * 5

3.14159 * 0.064516 ÷ 4 * 1.5 * 5 = 0.380

The columns have a volume of 0.380 cubic metres.

Calculating the volume of the pads;

0.7² * 0.254 * 5

0.49 * 0.254 * 5 = 0.6223

The volume of the five pads is 0.6 cubic metres.

Adding both results together;

0.380 + 0.6223 = 1 .002

It will take 1 cubic metres of concrete to pour these five columns with pads.

To convert cubic metres to cubic yards multiply cubic metres * 1.30795061931439 To convert cubic metres to cubic feet multiply cubic metres * 35.3146667214886

- Circle
- Circle - Metric
- Donut
- Donut - Metric
- Ellipse
- Ellipse - Metric
- Equilateral Triangle
- Equilateral Triangle - Metric
- Octagon
- Octagon - Metric
- Oval
- Pentagon
- Pentagon - Metric
- Scalene Triangle
- Scalene Triangle - Metric
- Stadium Shape
- Stadium Shape - Metric
- Trapazoid
- Trapezium
- Plastic Concrete Footing Form