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Donut-Shaped Slab - Footing Calculator

Calculator For Donut Shape

The Donut-Shaped Slab Footing Calculator is a tool for calculating essential parameters of a slab footing with a ring-like structure. This calculator helps you determine the footing width, surface area, inner and outer perimeter lengths, and the total perimeter of a circular slab footing with a hollow center. Additionally, it calculates the volume of concrete required in cubic feet, cubic yards, and cubic metres, helping you plan material quantities accurately for construction projects.

Donut Shaped Slab / Footing

Outer Diameter ft in
Inner Diameter ft in
Depth in
     
Width of Footing in
Surface Area of Footing ft²
Inner Perimeter ft
Outer Perimeter ft
Total Length of Perimeter ft

Amount of Concrete Needed in:
Cubic Feet ft ³
Cubic Yards yd ³
Cubic Metres m³

Calculator

  1. enter the outer diameter in feet
  2. enter the inner diameter in feet and inches
  3. he depth of the concrete slab in inches

Results

  1. the width in inches
  2. square footage of the surface area of the footing or slab
  3. the inside perimeter in lineal feet
  4. outside perimeter in lineal feet
  5. combined perimeter, the outside plus the inside in lineal feet
  6. amount of concrete needed in cubic feet
  7. concrete needed in cubic yards
  8. required concrete in cubic metres

Formula's

Total Area
A = π * D²  ÷ 4
where A is the area in square feet
π = 3.14159265358979
D = outer diameter of the circle
Perimeter
P = π * D ÷
where P is the perimeter in feet
p = 3.14159265358979
D = diameter of the circle
Volume
V = π * D² ÷ 4 * (d ÷ 12) where V is the volume in cubic feet
p = 3.14159265358979
D = diameter of circle
d = depth of slab in inches
Example calculation for volume:
outer diameter = 24 feet
inner diameter = 22 feet
depth of slab = 4 inches
Calculate the total volume first, then the inside area volume, and subtract this from the total volume; 
3.14159265358979 * 24 * 24 ÷ 4 * ( 4 ÷ 12) = 150.796
The donut's total volume is 150.796 cubic feet.

The inner area's volume; 
3.14159265358979 * 22 * 22 ÷ 4 * ( 4 ÷ 12) = 126.711
The volume of the inner circle is 126.711 cubic feet

Subtract the inner volume from the total volume: 
150.796 - 126.711 = 24.1
You need 24.1 cubic feet of concrete for this footing.

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

Use this Donut-Shaped Slab Footing Calculator to ensure accurate planning and material estimates for your construction project. By entering the dimensions, you'll get essential measurements and concrete volume needs, helping you streamline your preparation and budgeting for slab footing installations.

When Ordering Concrete

This concrete calculator will help you in estimating the amount of concrete needed for your project. The amount given as needed, does not include any waste. It is recommended, depending on the job you are doing, to add anywhere from an extra 4% to 10% to your concrete order to make sure you have enough concrete to finish the job. Ask when ordering the concrete. They will be able to give you a good idea of what is needed.

Concrete Volume Calculators

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