Land Area Converter
Convert land area between Ropani-Anna-Paisa-Dam, Bigha-Kattha-Dhur, and standard units.
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About this calculator
Formula: Bricks = wall area × (wall thickness ÷ brick width) ÷ [(brick length + 10 mm) × (brick height + 10 mm)] · 6 inputs · step-by-step working
Estimates total bricks plus mortar for masonry walls. Defaults follow common Nepali clay brick sizes (240×115×75 mm).
Formula
Bricks = wall area × (wall thickness ÷ brick width) ÷ [(brick length + 10 mm) × (brick height + 10 mm)]
How to Use
Enter wall dimensions in metres. Adjust brick size if you use a different module.
How the brick count is worked out
The calculator works from the wall face. With a 10 mm mortar joint, each default brick covers (0.24 + 0.01) × (0.075 + 0.01) = 0.02125 m² of wall face, so one layer of bricks needs 1 ÷ 0.02125 = 47.06 bricks per m². The number of layers is the wall thickness divided by the brick width: 1 for a 115 mm half-brick wall, 2 for a 230 mm full-brick wall. The count is wall area × layers ÷ face area, rounded up to a whole brick.
Mortar is what is left of the wall volume once the bricks are in: wall volume minus the number of bricks × the volume of one brick. Defaults are a 240 × 115 × 75 mm clay brick and a 115 mm wall; change any field to match what your supplier actually delivers. All sizes are entered in metres, so a 230 mm brick is 0.23.
The result is the net number of bricks in the finished wall. It does not add breakage or cutting waste, and it has no input for doors or windows, so deal with both yourself as shown below.
Bricks per square metre of wall (calculator output, before waste)
| Brick size | Wall thickness | Bricks per m² |
|---|---|---|
| 240 × 115 × 75 mm (default) | 115 mm (half brick) | 48 |
| 240 × 115 × 75 mm (default) | 230 mm (full brick) | 95 |
| 230 × 110 × 55 mm | 110 mm (half brick) | 65 |
Figures are for a 1 m × 1 m wall, rounded up. For a real wall, enter its actual dimensions rather than multiplying these figures, so the rounding happens only once.
Doors, windows and waste: from count to order
To allow for openings, work out the gross wall area (length × height), subtract the width × height of every door and window, divide the net area by the wall height, and enter that as the wall length. Then add a waste allowance for broken bricks and cuts at corners and openings: about 5% for straight interior walls and about 10% for exterior walls or walls with many corners and openings.
Two worked examples (default 240 × 115 × 75 mm bricks)
| Step | Room partition | Exterior wall |
|---|---|---|
| Wall size | 4 m × 2.7 m | 6 m × 3 m |
| Thickness entered | 0.115 (half brick) | 0.23 (full brick) |
| Openings | One door 0.9 × 2.1 m = 1.89 m² | Two windows 1.2 × 1.2 m = 2.88 m² |
| Net wall area | 10.8 − 1.89 = 8.91 m² | 18 − 2.88 = 15.12 m² |
| Length to enter | 8.91 ÷ 2.7 = 3.3 m | 15.12 ÷ 3 = 5.04 m |
| Calculator result | 420 bricks | 1,424 bricks |
| Result without deducting openings | 509 bricks | 1,695 bricks |
| Waste allowance | +5% = 441 bricks | +10% = 1,567 bricks |
| Round up the order to | About 450 bricks | About 1,600 bricks |
Brick size, wall thickness and mortar in Nepal
- Brick sizes vary between kilns and regions. Smaller bricks raise the count a lot: in the table above, moving from the default brick to a 230 × 110 × 55 mm brick takes a half-brick wall from 48 to 65 bricks per m². Measure ten bricks from the actual delivery, average them, and enter those sizes.
- Machine-pressed bricks are more uniform than hand-moulded ones, so the estimate usually matches the wall more closely.
- Half-brick walls are typical for partitions and infill panels in RCC frame houses; full-brick walls are used for boundary walls and heavier exterior walls. Which walls are load-bearing, and how thick they must be, comes from your structural drawings, not from a material estimate.
- Brickwork mortar is usually specified somewhere between 1:4 and 1:6 cement to sand, with the richer 1:4 mix for exterior and load-bearing walls. Use the mix on your drawings or the one your engineer specifies.
- The Cement, Sand & Aggregate Calculator is set up for three-part concrete mixes, so it cannot split a two-part mortar ratio. Your mason or engineer can convert the mortar volume from this page into cement bags and sand.
Checking brick quality before you order
- Strike two bricks together: well-fired bricks give a clear ringing sound, while under-fired ones sound dull.
- Reject bricks with cracks, badly chipped edges or warped faces; they break during laying and add to waste.
- Look for even colour through the batch. Patchy colour often means uneven firing.
- For a simple absorption check, weigh a dry brick, soak it for 24 hours and weigh it again. A commonly used limit for ordinary clay bricks is about 20% of the dry weight; much higher absorption points to a weak, porous brick.
- Bricks are usually sold per thousand. On large orders, spot-check the count and measure a few bricks from each load, since size can change between batches.
This is a planning estimate for materials. For load-bearing or earthquake-resistant walls, follow the structural design from a licensed engineer.