Spike's Calculators

Calculate the amount of concrete needed for pouring footings using feet and inches for measurements.

- enter the length of the footings in feet and inches
- the width in inches
- depth of footings in inches

- the perimeter of footings (for forming material in lineal feet)
- amount of concrete needed in cubic feet
- concrete needed in cubic yards
- concrete needed in cubic metres

length * width * depth = Volume

length of footings = 120' width = 20" depth of = 6"

The multiplication is easier done if all the units used are the same.

Convert the inches to feet by dividing the inch amount by 12 (there are 12 inches in one foot);

20 ÷ 12 = 1.67 (rounded to two decimals) 6 ÷ 12 = 0.5

Now using the above formula, you can easily calculate the volume of the footings in cubic feet;

120 * 1.67 * 0.5 = 100.2You need 100.2 cubic feet of concrete.

To convert cubic feet to cubic yards multiply cubic feet * 0.037037037037037 To convert cubic feet to cubic metres multiply cubic feet * 0.028316846592 To convert cubic yards to cubic metres multiply cubic yards * 0.764554857984

- 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