Brick Wall Calculator
Estimate how many bricks and how much mortar you need for a wall. Enter dimensions in metric units.
Tip: Standard UK brick size is 215 × 102.5 × 65 mm, usually with ~10 mm mortar joints.
If you are planning a garden wall, boundary wall, shed wall, or any brickwork project, one of the first questions is simple: how many bricks do I need? This brick wall calculator gives a fast estimate based on your wall dimensions, brick size, mortar joint thickness, and waste percentage.
Why a brick wall calculator helps
Under-ordering bricks can delay a project and increase delivery costs. Over-ordering can leave you with wasted material and tied-up budget. A calculator gives you a practical starting number so you can buy with more confidence.
It also helps when comparing project options. For example, if you increase wall thickness, change brick dimensions, or include larger openings, the material count changes quickly. Seeing those changes in real time makes planning easier.
How the calculator works
1) Net wall area and volume
The calculator first computes the gross wall area (length × height), then subtracts openings such as doors and windows to get net area. After that, it multiplies by wall thickness to estimate wall volume.
2) Brick module volume
A finished wall includes mortar around each brick. So instead of using only raw brick volume, the calculator uses a “module” size:
- Module length = brick length + mortar joint
- Module height = brick height + mortar joint
- Module width = brick width + mortar joint
Dividing wall volume by module volume gives an estimated brick quantity before waste.
3) Waste allowance
Real projects need cuts, breakages, and contingency. A typical waste allowance is 5% to 10%. The calculator adds your chosen percentage and rounds up to a practical whole-brick order quantity.
Recommended input values
- Wall thickness: Use the actual design thickness from your plans.
- Mortar joints: 10 mm is common for many residential projects.
- Waste: 5% for simple walls, 10% or more for complex patterns and lots of cuts.
- Openings: Include doors, gates, windows, and service openings.
Practical factors the estimate does not fully capture
This calculator is designed for quick planning and budgeting. On-site requirements can still shift the final count:
- Bond pattern (stretcher bond, English bond, Flemish bond)
- Corners, piers, returns, and curved sections
- Lintels, movement joints, and reinforcement details
- Local building code requirements and structural design
- Different manufacturing tolerances among brick suppliers
Mortar estimate explained
The tool also estimates wet mortar volume by subtracting brick volume from wall volume. This is useful for rough material planning. If you need dry material batching (cement/sand), multiply wet mortar by a bulking factor (often around 1.3 to 1.35), then apply your mix ratio.
Quick planning tips for better ordering
Order in batches with a buffer
For large projects, staged deliveries can reduce storage problems and accidental damage. Keep a small buffer beyond calculated needs.
Check brick availability early
Lead times can vary by color, texture, and supplier. Confirm availability before committing to a start date.
Match bricks from the same batch when possible
This can reduce color variation and improve final appearance, especially on visible feature walls.
Final note
Use this calculator as a practical estimating tool, then confirm quantities with your builder, mason, or structural professional before purchase. Accurate dimensions and realistic waste assumptions are the keys to reliable results.