Blocks for a 6 × 1 m wall
A wall this low is a garden wall, a raised bed or planter edge, or a seat wall. This wall is 6 m². Counts are for standard 440 × 215 mm blocks with 10 mm joints, with 5% waste.
| Block thickness | Blocks | Wet mortar (m³) | Cement (25 kg bags) | Building sand (tonnes) |
|---|---|---|---|---|
| 100 mm | 63 | 0.049 | 1 | 0.09 |
| 140 mm | 63 | 0.069 | 1 | 0.12 |
| 190 mm | 63 | 0.094 | 2 | 0.16 |
| 215 mm | 63 | 0.106 | 2 | 0.18 |
Use the UK block calculator to deduct openings or change the mortar mix, and read how many concrete blocks you need for the foundation and damp-proofing advice. Blocks are usually rendered or faced, so check the render calculator too.
Want to change anything else? The calculator above is the full Concrete Block Calculator (UK): edit any number and the results update instantly.
Tools & materials for this project
Affiliate links As an Amazon Associate we earn from qualifying purchases. These links do not change what you pay.
Frequently asked questions
How many concrete blocks do I need for a 6m x 1m wall?
A 6 × 1 m wall is 6 m². Standard 440 × 215 mm blocks run at about 10 per m², so you need 63 blocks including 5% for cuts and breakage. Without any allowance it is 60.
How much mortar for a 6m x 1m block wall?
About 0.049 m³ of wet mortar for 100 mm blocks, which is 1 bags of 25 kg cement and 0.09 tonnes of building sand at a 5:1 mix. Thicker blocks need more mortar, as the table shows.
Does the block thickness change the count?
No. The face of a block is the same 440 × 215 mm whatever its thickness, so the count stays at 63. Only the mortar changes, because the bed is deeper.
Related sizes and guides
Related sizes
Estimates only. Results assume standard materials and simple shapes. Supplier products vary, and the final call on quantity, structure and safety is yours. Check your local code and your supplier's guidance before ordering.