How Many Bags of Cement to Build a House?

Direct answer: for a 100-150 m² single-family house on one or two levels, plan for 300 to 600 fifty-kg bags of cement, all work packages included — foundations, walls, slab and plaster. The usual rule of thumb on Moroccan sites is 3 to 4 bags per square metre of floor area. But that figure swings by a factor of two with surface, number of storeys, soil nature and finish level: only a package-by-package count gives a defensible number.

The package-by-package count

A house is built in packages, each consuming its own concrete or mortar at its own mix ratio. Foundations and structural elements are cast at 350 kg/m³ with CPJ 45 or CPJ 55 cement, a slab on grade needs 300 kg/m³, masonry and plaster work with mortar dosed at 250-350 kg/m³. The total is built by pricing each volume — not by applying a random lump sum.

Total: 350 to 600 bags for a complete house, more for a two-storey build — the structural share (columns, beams, upper floor) takes over from masonry. Conversely, a hollow-block build with modest plaster and a hollow-core floor stays at the bottom of the range.

The 4-step calculation method

The calculation is a simple chain: volume x ratio / 50. First the volume: length x width x thickness for each concrete pour, wall area x joint thickness for masonry. Then the ratio: 350 kg/m³ for reinforced concrete, 300 for slabs, 250-350 for mortars. Finally the conversion into 50 kg bags.

Concrete example for a 20 m² terrace slab, 12 cm thick: 20 x 0.12 = 2.4 m³ of concrete. At 300 kg/m³, the requirement is 2.4 x 300 = 720 kg of cement, i.e. 15 bags of 50 kg (14.4 rounded up). Add 5-10% for waste and touch-ups: order 16 bags and gain peace of mind.

What moves the total

• The number of storeys: a second level nearly doubles the structural concrete share (columns, beams, upper floor) compared to a single-storey build;
• The construction system: hollow or solid blocks, hollow-core floor or solid slab, stone bearing walls — every choice shifts the volumes;
• Soil nature: poor bearing capacity thickens footings and can force a full raft foundation, a heavy concrete line;
• Finishes: scraped plaster, screed, curbs and copings consume mortars that get left out of counts;
• Site discipline: waste, dried mortar, badly stored bags — 10% loss is a realistic figure without care.

The right reflex: calculate before ordering

Our dosage calculator turns these rules into figures for your exact volumes, package by package. And because a site never stops to wait for a truck, DAM delivers CPJ 45 and CPJ 55 cement within 24h in Dakhla — bags, big bag or bulk — at per-tonne posted prices, no quote surprises. Structural design belongs to the engineer: these orders of magnitude serve the budget, never the design calculations.