Spike's Calculators

Calculate the amount of concrete needed for a circular slab, using metric measurements.

To make this calculation you need to know the diameter of the circle in metres and the required depth of this slab in millimetres.

Area A = π * D² ÷ 4 where A is the area in square metres, π = 3.14159265358979, D = diameter of the circle Perimeter P = π * D where P is the perimeter in metres, π = 3.14159265358979, D = diameter of circle Volume A * (d ÷ 1000) Where A is the area metres, d the depth in millimetres

Diameter of slab = 24.6 metres depth of slab = 100 millimetres

3.14159265358979 * 24.6 * 24.6 ÷ 4 = 475.29

This slab has an area of 475.29 square metres;

3.14159265358979 * 24.6 = 77.28

The circumference of the slab is 77.28 metres.

475.29 * (100 ÷ 1000) = 475.29 * 0.1 = 47.529

You need 47.529 cubic metres for this slab.

To convert cubic metres to cubic yards, multiply cubic metres * 1.30795061931439

To convert cubic metres to cubic feet, multiply cubic metres * 35.3146667214886

- enter the diameter of the slab in metres
- slab depth in millimetres

- area of slab in square metres
- perimeter of slab
- concrete needed in cubic metres
- concrete needed in cubic yards
- concrete needed in cubic feet

- 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