Cement Bags Calculator
Pick the job — a roof (lenter), plaster for a room, a floor, columns and beams, brickwork or a whole house — and see the cement bags, sand and crush it takes on today's rates. Send the list to your supplier on WhatsApp.
What are you making?
The roof (lenter)
Roof over
Slab thickness
Mix (cement : sand : crush)
Cement for: Roof of 14' × 12' room
15 bags
34 cft sand · 69 cft crush · 352 litres water
- Cement
- Rs 24.3 Thousand
- Sand + crush
- Rs 11.21 Thousand
- Total
- Rs 35.51 Thousand
What to buy
Lahore rates- Cement (50 kg bags)Rs 1,620 a bag15 bagsRs 24,300
- SandCoarse sand — Chenab / Lawrencepur34 cftRs 2,587
- Crush (bajri)Margalla / Sargodha, ½"–¾"69 cftRs 8,624
Material totalRs 35,511
Steel, Labour, water and transport are extra. Cement includes 2% for spill.
How it's worked out
Good to know
- Keep concrete wet (curing) for at least 7 days — 14 for a roof. Don't remove roof shuttering before about 14 days.
- Pour a roof in one go: order all the cement, sand and crush before the day, and keep a few spare bags.
- Use cement within about 3 months of the date printed on the bag, and store it off the floor, away from damp.
- Today's rates: cement, sand, crush.
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How it works
How cement is worked out
Concrete: length × width × thickness gives the finished volume. Cement, sand and crush shrink when mixed, so the dry materials are 1.54 × that, split by the mix — 1:2:4 is one part cement, two sand, four crush (7 parts). A 50 kg bag is 1.25 cft.
Plaster: area × thickness, × 1.3 for joints, uneven walls and what falls, split by the mix (1:4, 1:6…).
Brick mortar: 30 cft of dry mortar per 100 cft of brickwork. We add 2% to the cement for wastage and round up to whole bags.
Questions people ask
How many cement bags are in 1 cubic metre of 1:2:4 concrete?
About 6.3 bags of 50 kg, with 16 cft of sand and 31 cft of crush — the dry materials are 1.54 times the finished volume.
How many cement bags does a 1,000 sq ft roof slab need?
A 5-inch slab of 1,000 sq ft in 1:2:4 needs about 75 bags of cement, 183 cft of sand and 367 cft of crush (about Rs 121,500 of cement today).
How many cement bags for the roof (lenter) of one room?
A 12 ft × 12 ft room with a 5-inch slab and its beams, in 1:2:4, takes about 13 bags of cement, 30 cft of sand and 59 cft of crush.
How much cement to plaster a room?
A 12 ft × 10 ft room, 10 ft high — four walls less a door and a window, plus the ceiling — in ½-inch 1:6 plaster takes about 4 bags of cement and 24 cft of sand.
How many cement bags does a 5 marla house need?
A double-storey 5 marla house (about 2,026 sq ft covered) takes roughly 550 bags, from foundations to plaster — about 0.27 bags per sq ft of covered area.
How much cement does plaster need?
About 0.88 bags for 100 sq ft of ½-inch plaster in 1:4, and 4.3 cft of sand. Inside walls are usually 1:6, outside 1:4, ceilings 1:3 and ⅜ inch.
What is the volume of a 50 kg cement bag?
1.25 cubic feet (about 0.035 cubic metres).
Which concrete mix should I use?
1:2:4 for roof slabs, beams and lintels (the usual); 1:1.5:3 for columns and heavy beams; 1:3:6 for plain concrete under floors; 1:4:8 lean concrete under foundations.
What is the cement rate today?
About Rs 1,620 a 50 kg bag in Lahore today — see brand-by-brand prices on the cement rate page.