Slab

Slab concrete

Slab lengthSlab widthNo. of such slabsnosDeduct openings (stair, lift, duct)Thickness

Concrete Volume

m³

Mark

Quantitynos

How we got this

1
Net slab area
A = (Length × Width − Openings) × No. of such slabs
= (0 × 0 − 0) × 1
= 0 m²
For an L-shaped or irregular slab, split it into rectangles, or use the Irregular Area calculator and enter the result as length × 1.
2
Concrete volume
V = Area × Thickness
= 0 × 0
= 0 m³
3
Dry volume of concrete
Dry volume = Wet volume × 1.54
= 0 × 1.54
= 0 m³
Dry ingredients bulk up; they lose ~54% volume once water is added and the mix is compacted.
4
Cement (M20 = 1 : 1.5 : 3, sum of ratio 5.5)
Cement volume = Dry volume × 1 / 5.5 ; bags = volume / 0.0347
= 0 × 1/5.5 = 0 m³ ÷ 0.0347
= 0 bags (0 kg)
One 50 kg bag of cement occupies 0.0347 m³ (density 1440 kg/m³).
5
Sand (fine aggregate)
Sand = Dry volume × 1.5 / 5.5
= 0 × 1.5/5.5
= 0 m³
6
Coarse aggregate (20 mm)
Aggregate = Dry volume × 3 / 5.5
= 0 × 3/5.5
= 0 m³
7
Water (for W/C 0.5)
Water = Cement weight × 0.50
= 0 × 0.50
= 0 litres
8
Curing
Pond or wet-cover for 14 days minimum
= IS 456 Cl. 13.5
= 7 days for OPC with admixture, 14 days normal, 10 days for PPC

Method used: One/two-way slab span-to-depth method — IS 456 Cl. 23.2 deflection control

Slab concrete = plan area × thickness. Typical residential slab thickness is span/28 to span/32 for a two-way slab, commonly 125–150 mm.

•M20 grade, nominal mix 1 : 1.5 : 3 (cement : sand : aggregate).
•Dry-volume factor 1.54 on wet concrete volume.
•Cement bag = 50 kg = 0.0347 m³ (bulk density 1440 kg/m³).
•Water-cement ratio 0.50; adjust for admixtures or site moisture.
•No deduction for embedded reinforcement (usually < 1.5% of volume).
•For reinforcement, use the Steel Quantity calculator or the full Bar Bending Schedule (BBS).
•Area is the net slab area; deduct staircase and lift openings.

Estimates for guidance only. Confirm quantities with your site engineer.