10 × 2.5 m wall with a 2 m² door
50 × 20 cm blocks, 1 cm joints, 5 % margin: 23 m² net, 9.34 blocks/m², 226 blocks, about 362 L of mortar and 4 bags of cement.
Block and brick calculator
Enter the wall size, the openings to deduct and the block format: PRAXAO calculates the number of blocks or bricks with a breakage margin, the mortar volume and the cement bags to buy.
Result
Fill in the fields to see the result.
Your last inputs are kept in this browser.
Results are provided for information. Check tax rates and legal requirements that apply to you.
How to use it
- Enter the wall length and height, or its area directly.
- Deduct the openings (doors, windows) in m².
- Enter the block size in centimetres and the joint in millimetres.
- Adjust the mortar per m² and the cement dosage to your practice.
Examples
Frequently asked questions
How many blocks per m²?
With 50 × 20 cm blocks and 1 cm joints, about 9.3 per m². The calculator uses your block size and joint, so it also works for bricks.
How much mortar does a block wall need?
Roughly 10 to 25 litres per m² depending on the block thickness and the joints. Hollow blocks laid with thin joints need less.
Should I deduct doors and windows?
Yes, deduct the openings, but keep the breakage margin: cuts around openings and lintels create waste.
Related tools
BUILNORA
Concrete Calculator
Volume of concrete for slabs, footings and columns, with waste margin and cement, sand and gravel quantities.
BUILNORA
Rebar Weight Calculator
Weight of reinforcing steel from diameter and length, laps included, and the 12 m bars to buy.
Quote Generator
Prepare a clear quote or estimate for your client, with validity date, taxes and totals, ready as PDF.