Cement Calculator Nigeria — Bags Needed for Construction
Calculate how many bags of cement you need for block laying, plastering, floor screeding or concrete work. Includes Dangote cement cost estimate and sand quantity.
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Material Summary
Standard Cement Ratios for Nigerian Construction
| Activity | Mix Ratio | Bags per Unit |
|---|---|---|
| Block Laying (9-inch) | 1:6 | 1 bag per 35 blocks |
| Block Laying (6-inch) | 1:6 | 1 bag per 40 blocks |
| Wall Plastering | 1:4 | 0.5 bag per sqm |
| Floor Screeding | 1:3 | 0.35 bag per sqm |
| Concrete (1:2:4) | 1:2:4 | 7.5 bags per m³ |
Frequently Asked Questions
How many bags of cement do I need to lay blocks?
For standard block laying, you need approximately 1 bag of cement per 35 blocks using a 1:6 cement-to-sand mix. This assumes 9-inch sandcrete blocks. For 6-inch blocks, you can stretch to 1 bag per 40 blocks. Always buy 5–10% extra to account for waste.
How much cement is needed for plastering?
For a 15mm plaster coat, you need approximately 0.5 bags of cement per square meter using a 1:4 mix. For a 12mm scratch coat + 8mm finish coat (two-coat plaster), multiply by 1.5. Calculate the total wall area minus doors and windows.
What is the current price of Dangote cement in Nigeria?
As of early 2026, Dangote 42.5 grade cement costs approximately ₦7,000–₦8,500 per 50kg bag depending on location. Prices are higher in remote areas due to transportation costs. BUA and Eagle cement are alternatives at similar price points. Always confirm current market prices before budgeting.
How many bags of cement to mix one cubic meter of concrete?
For a standard 1:2:4 mix (1 part cement : 2 parts sand : 4 parts gravel), you need approximately 7.5 bags (50kg each) per cubic meter of concrete. For a stronger 1:1.5:3 mix used for structural columns and beams, you need approximately 9–10 bags per cubic meter.
How do I calculate sand quantity alongside cement?
For block laying (1:6 mix): approximately 0.028 cubic meters of sand per bag of cement. For plastering (1:4 mix): approximately 0.2 cubic meters of sand per bag of cement. For concrete (1:2:4 mix): approximately 0.45 cubic meters of sand per cubic meter of concrete. This calculator includes sand estimates alongside cement.