Round Concrete Slab / Footing Volume Calculator (Metric Units)
The Concrete Circle Volume Calculator - Metric computes the exact amount of ready-mix required for circular slabs, piers, pads, and column footings. Input the circle's diameter in metres and pour depth in millimetres; the tool instantly returns:
- Surface area in square metres-handy for reinforcement and finish estimates.
- Concrete volume in cubic metres (primary ordering unit).
- Parallel totals in cubic yards and cubic feet for suppliers or site crews using imperial.
Working in imperial units? Use the Circle Concrete Calculator - Imperial.
Explore more metric concrete shapes:
Circular Concrete Slab - Metric
Calculator
- enter the diameter of the slab in metres
- slab depth in millimetres
Results
- area of slab in square metres
- perimeter of slab
- concrete needed in cubic metres
- concrete needed in cubic yards
- concrete needed in cubic feet
Casting a cylindrical column on this pad? Work out both together with the
Concrete Column + Pad Calculator - Metric.
For square or rectangular pours, see the
Concrete Slab Calculator - Metric.
Formulas:
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
Example calculation;:
Diameter of slab = 24.6 metres depth of slab = 100 millimetres
Area
Calculate the square metres of the slab using the area formula;3.14159265358979 * 24.6 * 24.6 ÷ 4 = 475.29
This slab has an area of 475.29 square metres;
Perimeter
Calculate the circumference of the slab using the perimeter formula;3.14159265358979 * 24.6 = 77.28
The circumference of the slab is 77.28 metres.
Volume
Calculate the amount of concrete needed by multiplying the area by the thickness of the slab;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