Spike's Calculators

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

- enter the length of A in metres
- the length of B in metres
- the slab depth in millimetres
- waste factor (if required) in a percentage

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

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

Length A = 40 metres Length B = 6 metres Depth = 152 millimetres

M = 40 ÷ 2 M = 20 N = 6 ÷ 2 N = 3

3.14159 * 20 * 3 = 188.495559 rounded to 188.5

The surface area of this slab is 188.5 square metres.

```
2 * 3.14159 * √(20² + 3²) ÷ 2
2 * 3.14159 * 14.3 = 89.84954989 rounded to 89.9
```

The perimeter (circumference) of the slab is 89.9 lineal metres.

Multiply the area square footage by the depth of the slab. First, convert the 152 millimetres to metres by dividing by 1000.

152 ÷ 1000 = 0.152

152 millimetres = 0.152 metres

188.5 * 0.152 = 28.652

You will need 28.652 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