To know how many blocks can build a room, it would be very useful to have BEDROOM LAYOUT PLANS with dimensions. Also you’ll need these:
- Calculate the sqm or sq ft of walls according to the room size in question (and the height of ceiling).
- Know how many blocks per sqm or sq ft a wall has (technical calculations).
- Later, make a summary of all information.
Next we will make different calculations to build the walls of a room with different measurements. For each room size, FLOOR PLANS WITH MEASUREMENTS, are shown.
How many Blocks do I Need for a Single Room?
How Many Blocks can Build a Room (10 x 10 ft Room)
The 3x3m room height is 2.60m (8′ 6”). It is considered that cinder blocks should be slightly embedded into cyclopean foundation and 150mm (6”) below the finished floor level, so the total height of all walls is 2.75m (9 ft).
Number of Blocks needed to Build a 10×10 ft Room
To know how many blocks is needes to make a 3×3 meters room (10×10 ft room), we will consider the construction of the room with 400x200x150 mm cinder blocks (16” x 8” x 6” blocks).
It has been considered to build small 6” x 6” columns (150×150 mm) in the 4 corners of the 10×10 ft room. In addition, a 825x2125mm door (32”x85”), a 1200x1200mm window (45”x45”), and 150mm lintels (6”x6” section) over the door and window.
| 10’x10′ Room (9 ft Height) | ||
| Wall Area | Length | Length |
| 5.68 sqm (61.1 sq ft) | 108 in. | 2.85 m |
| 7.43 sqm (80.1 sq ft) | 108 in. | 2.85 m |
| 5.43 sqm (58.6 sq ft) | 108 in. | 2.85 m |
| 7.43 sqm (80.1 sq ft) | 108 in. | 2.85 m |
| 25.96 sqm (280 sq ft) | 432 in. | 11.40 m |
The total area of walls is 25.96 m² (280 sq ft). This value must be divided by 12.5 (blocks/sqm), resulting in 320 cinder blocks. This value (320u) is multiplied by 1.03 (3% loss). The end result is 330 blocks.
The number of blocks needed to build a 10×10 ft (3×3 m) room with 2.60 m high walls is 330 blocks with 400x200x150mm (16”x8”x6”) cinder blocks.
10’x10′ Room with 2.50m High Walls
The number of blocks needed to build a 3 x 3 m room with 2.50 m high walls (under cover) is 320 units with 400 x 200 x 150 mm blocks.
10×10 ft Room with 2.40m High Walls
The number of blocks needed to build a 3 x 3 m room with 2.40 m high walls (under roof) is 308 units with 400 x 200 x 150 mm cinder blocks.
How many Blocks do I need for a 12×10 ft Room
Keeping similar conditions as the example explained above, now the calculation for a 12×10 feet room is shown.
| 10×12 ft Room (9 ft Height) | ||
| Wall Area | Length | Length |
| 5.96 sqm (65 sq ft) | 111 in. | 2.80m |
| 10.18 sqm (110 sq ft) | 146 in. | 3.70m |
| 5.64 sqm (61 sq ft) | 111 in. | 2.80m |
| 10.18 sqm (110 sq ft) | 146 in. | 3.70m |
| 31.95 sqm (346 sq ft) | 514 in. | 13.0m |
The number of blocks needed to make a 3×4 m room with 2.60 m high walls is 412 blocks of 400x200x150 mm.
10×12 ft Room with 8′ 3 ” High Walls
The necessary quantity is 395 blocks of 400x200x150 mm.
10×12 ft Room with 8′ High Walls
The necessary quantity is 379 blocks of 400x200x150 mm.
Amount of Blocks to make a 12×12 ft Room
| 12×12 ft Room h=8′ 6” | ||
| Wall Area | Length | Length |
| 8.71 sqm (94 sq ft) | 151 in. | 3.85 m |
| 10.18 sqm (110 sq ft) | 151 in. | 3.85 m |
| 8.39 sqm (91 sq ft) | 151 in. | 3.85 m |
| 10.18 sqm (110 sq ft) | 151 in. | 3.85 m |
| 37.45 sqm (405 sq ft) | 604 in. | 15.4 m |
How many Pieces of Block can build a Single Room?
To make a 4×4 m room (12×12 ft) with 2.60 m high walls (8′ 6” ceiling height), you need ( 37.45 m²) or (403 sq ft), these are, 482 CONCRETE BLOCKS of 400x200x150 mm (3% shrinkage included).
You can make your own calculations, defining the height of the room, the number of windows, the number of columns and the cinder block dimensions. Later, I will show you this…
How Many Blocks do I need for a 12×16 ft Room
For the following calculation of number of blocks, are discounted the area of 2 window openings with 1200×1200mm and the door of 2100x800mm.
| 12×16 ft Room h=8′ | ||
| Wall Area | Length | Length |
| 12.74 sqm (137 sq ft) | 230 in. | 5.85 m |
| 10.18 sqm (110 sq ft) | 152 in. | 3.85 m |
| 13.89 sqm (150 sq ft) | 230 in. | 5.85 m |
| 10.18 sqm (110 sq ft) | 152 in. | 3.85 m |
| 46.98 sqm (507 sq ft) | 754 in. | 19.40 m |
To build a 6×4 m room (12×16 ft) with 2.60m high walls (height under ceiling), we need 605 cinder blocks with 400x200x150mm size.
16x12ft Room with 8′ 4” High Walls
580 blocks of 400x200x150 mm are needed (includes 3% loss).
16x12ft Room with 8′ High Walls
556 blocks of 400x200x150 mm are needed (3% loss is included).
How many Blocks for 1 Bedroom
Now let’s see an interesting example of a MASTER SUITE PLAN (with bathroom and dressing room).
The interior is functional, with a SIMPLE BATHROOM DESIGN in two zones. A door could be included to further separate the tub and the toilet. The entrance to the dressing room is between the room and the tub.
It has the best DISTANCE TO WATCH TV from a queen BED SIZE.
| Spaces | Area | Area |
| Bedroom | 159.3 sq ft | 14.8 sqm |
| Dressing | 63.3 sq ft | 5.9 sqm |
| Bathroom | 50.1 sq ft | 4.7 sqm |
| Shower | 44.8 sq ft | 4.2 sqm |
| Total | 317.5 sq ft | 29.5 sqm |
For the calculation, a finished floor height of 2.50m (9 ft) has been considered, so the block walls are built 2.65m (8′ 8”) high.
Door and window opening areas are discounted, as well as where columns and lintels go.
| 6.4×4.3m Suite | ||
| Wall Area | Length | Length |
| 100mm wall | ||
| 2.9 sqm (31 sq ft) | 71 in. | 1.80m |
| 150mm walls | ||
| 13.25 sqm (143 sq ft) | 197 in. | 5.00m |
| 8.82 sqm (95 sq ft) | 158 in. | 4.00m |
| 7.0 sqm (75 sq ft) | 126 in. | 3.20m |
| 10.51 sqm (113 sq ft) | 181 in. | 4.60m |
| 7.95 sqm (86 sq ft) | 118 in. | 3.00m |
| 8.2 sqm (88 sq ft) | 138 in. | 3.50m |
| 2.78 sqm (30 sq ft) | 47 in. | 1.20m |
| 10.51 sqm (113 sq ft) | 181 in. | 4.60m |
| 69.02 sqm (743 sq ft) | 96 ft | 29.10m |
| 71.92 sqm (775 sq ft) | 101 ft | 30.90m |
So we have a total cinder block wall area to be built with 71.92 sqm (775sqft). Now we convert it to the number of cinder blocks with 100 and 150mm thickness.
In total, 926 blocks are required (37u with 100mm width and 889u with 150mm width).
How many Blocks do I Need for a 16×16 ft Room?
| 16×16 ft Room (9 ft high) | ||
| Wall Area | Length | Length |
| 10.05 sqm (109 sq ft) | 191 in. | 4.85m |
| 12.93 sqm (139 sq ft) | 191 in. | 4.85m |
| 11.14 sqm (120 sq ft) | 191 in. | 4.85m |
| 12.93 sqm (139 sq ft) | 191 in. | 4.85m |
| 47.04 sqm (507 sq ft) | 64 ft | 19.40m |
For 5x5m (16×16 ft) with 2.60m high walls (height from floor to ceiling), 605 blocks of 400x200x150mm (16”x8”x6” blocks) are needed.
With 2.50m high walls, 581 blocks of 400x200x150mm are needed.
With 2.40m high walls, 557 400x200x150mm blocks are needed.
How many Blocks do I need for a 6×6m Room
| 6x6m Room | |
| Wall Area | Length |
| 12.8 sqm | 5.85m |
| 15.68 sqm | 5.85m |
| 13.89 sqm | 5.85m |
| 15.68 sqm | 5.85m |
| 58.04 sqm | 23.40m |
How many Blocks to Build a 400 sq ft Room
For 6x6m (400 sq ft room) with 2.60m high walls (height from floor to ceiling), 747 blocks of 400x200x150 mm are needed.
With 2.50m high walls, 719 blocks of 400x200x150mm are needed.
With 2.40m high walls, 689 blocks of 400x200x150mm are needed.
Knowing the quantities of blocks you can calculate HOW MANY BAGS OF CEMENT PER SQM WALL CONSTRUCTION is needed.
Here you can calculate HOW MANY BLOCKS WILL BUILD A 12 BY 12 ROOM.
If you want more information to design and BUILD ROOMS, you can check these 12 BY 12 BEDROOM LAYOUTS.