Spike's Calculators

Calculate the amount of concrete you will need to pour an Ellipse (Oval) shaped slab, using feet and inches for measurements.

- enter the length of A in feet and inches
- the length of B in feet and inches
- the slab depth in inches
- waste factor (if required) in a percentage

- the area of the slab in square feet
- the perimeter (circumference) in lineal feet
- the amount of concrete needed in cubic feet
- in cubic yards
- in cubic metres

```
Area = 𝛑MN
Perimeter = 2𝛑√(M²+N²)/2
where 𝛑 equals 3.14159
M is length A ÷ 2
N is length B ÷ 2
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
```

Length A = 22 feet Length B = 10 feet Depth = 6 inches

M = 22 ÷ 2 M = 11 N = 10 ÷ 2 N = 5

3.14159 * 11 * 5 = 172.787595947 rounded to 172.79

The surface area of this slab is 172.79 square feet.

```
2 * 3.14159 * √(11² + 5²) ÷ 2
2 * 3.14159 * 8.544 = 53.683558797 rounded to 53.6
```

The perimeter (circumference) of the slab is 53.6 lineal feet.

Multiply the area square footage by the depth of the slab. First, convert the 6 inches to feet by dividing by 12.

6 ÷ 12 = 0.5

6 inches = 0.5 feet

172.79 * 0.5 = 86.395 rounded to 86.4

You will need 86.4 cubic feet of concrete for this slab.

- 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