Free tool · Nigeria
Block Calculator
Work out how many blocks, bags of cement, and wheelbarrows of sand you need for blockwork on Nigerian sites. Supports 9" and 6" blocks, multiple mortar mixes, and deductions for doors and windows using common opening sizes.
Block Calculator
Estimate block count, mortar materials, and walling cost.
Calculation Results
Save this estimate to your project
Create a free RazorBuilder account to store quantities, build a BOQ, and track materials on site.
Assumptions
- Block counts use standard Nigerian block sizes and typical mortar bed/joint allowances.
- Opening deductions use the sizes you enter — verify against your architectural drawings.
- Add extra blocks for corners, broken pieces, and site handling (see our wastage guide).
Worked example
A 10 m long × 3 m high 9" wall with two standard openings might need on the order of 250 blocks plus mortar materials — exact quantities depend on mix and openings entered.
Related resources
Need this on every job?
RazorBuilder stores calculator outputs in your project, turns quantities into BOQ lines, and tracks materials on site — so you are not re-typing the same wall or slab every week.