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Brick calculator
Find how many bricks, cement bags and how much sand you need for a wall. Enter the wall size in feet; type 10'6 for 10 feet 6 inches.
Result
Enter your sizes to see the result.
How it’s worked out
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How to use this calculator
- Enter the wall length and height in feet.
- Choose the wall thickness: 4½ inch (half brick), 9 inch (one brick) or 13½ inch.
- Subtract doors and windows as openings in square feet.
- Pick the mortar mix and check bricks per CFT (13 is common in Pakistan).
- Read the bricks, cement bags and sand, with the full working.
The formula
Brickwork (CFT) = length × height × thickness ÷ 12, after taking out doors and windows. Bricks = brickwork × bricks per CFT, plus wastage.
Mortar is the space left after the bricks: brickwork − bricks × 0.0592 CFT (one 8¾ × 4¼ × 2¾ inch brick). Dry mortar = wet × 1.33, then split by the mix: cement = dry ÷ (1 + sand parts), and one bag = 1.25 CFT.
Frequently asked questions
How many bricks are in 1 CFT of brickwork?
About 13 standard bricks (9 × 4½ × 3 inch with mortar) make one cubic foot of brickwork. Some contractors use 12 or 13.5; you can change it in the calculator.
How many bricks are needed for a 10 × 10 ft, 9 inch wall?
The wall is 10 × 10 × 0.75 = 75 CFT, so about 75 × 13 = 975 bricks, or about 1,024 with 5% wastage.
What mortar ratio should I use for brick masonry?
1:4 (one cement to four sand) is common for load-bearing walls; 1:6 is used for partition walls. Use 1:3 for work that needs extra strength.
Why multiply wet mortar by 1.33?
Dry sand and cement shrink when water is added, so you need about a third more dry material to get the wet mortar volume.
How much does one cement bag hold?
A 50 kg bag of cement is about 1.25 CFT (0.035 m³), which is the figure used here.