Brick Calculator
Estimate how many bricks you need for a wall using wall size, brick dimensions, mortar joint thickness, and waste allowance.
Tip: press Enter in any field to calculate.
- Gross wall area: 0 m²
- Net wall area (after openings): 0 m²
- Wall volume: 0 m³
- Bricks needed (without waste): 0
- Bricks needed (with waste): 0
- Bricks per m² (net): 0
- Estimated mortar required (dry): 0 m³
- Estimated brick cost: —
A good brick calculator helps prevent two expensive problems: ordering too few bricks and delaying the job, or ordering too many and wasting money. Whether you're building a garden wall, extension, partition, or boundary wall, a quick quantity estimate gives you better control over budget and schedule.
How this brick calculator works
This calculator uses a volume-based approach. It combines wall dimensions and brick dimensions (including mortar joints) to estimate the number of bricks. It then adds your waste percentage to account for breakage, cutting, and handling losses.
Formula summary
- Gross wall area = wall length × wall height
- Net wall area = gross area − openings area
- Wall volume = net wall area × wall thickness
- Nominal brick volume = (brick length + joint) × (brick width + joint) × (brick height + joint)
- Bricks required = wall volume ÷ nominal brick volume
- Final order quantity = bricks required × (1 + waste %)
Why mortar joint size matters
Many people forget mortar thickness, and that can skew results. A 10 mm joint increases the effective size of each placed brick, meaning fewer bricks are needed compared to using bare brick size only. If your site uses tighter or wider joints, change that value for more realistic output.
Recommended waste allowances
- 5% for simple walls with minimal cuts.
- 8–10% for complex layouts, many corners, and openings.
- 10–15% for decorative bonds or projects with transport risk.
Example: quick estimate
Suppose you have a 6 m long wall, 2.4 m high, with 1.8 m² of openings, and a half-brick thickness wall (102.5 mm). Using standard bricks (215 × 102.5 × 65 mm), 10 mm mortar joints, and 5% waste:
- The calculator finds your net wall size and volume.
- It estimates the base number of bricks before waste.
- It rounds up to the nearest whole brick for practical ordering.
This gives you a realistic purchasing figure you can send to your supplier.
Common factors that change real-world brick count
1) Bond pattern
English bond, Flemish bond, stretcher bond, and stack bond can produce different quantities due to layout and cutting.
2) Wall geometry
Curves, returns, piers, and angled walls generally increase wastage and labor.
3) On-site quality
Breakage from delivery, storage, and handling can be significant, especially on tight sites.
4) Brick manufacturing tolerances
Nominal dimensions can vary slightly by manufacturer. For large jobs, verify actual product dimensions before final procurement.
Practical ordering tips
- Round up, never down.
- Order all visible-face bricks from the same batch if color consistency matters.
- Keep extra units for future repairs.
- Confirm whether your supplier sells by piece, pack, or pallet.
Frequently asked questions
Can I use this for blockwork?
Yes, if you enter block dimensions and an appropriate joint size. The logic is the same.
Does this include mortar bags or cement quantity?
The calculator estimates mortar volume only. You can convert that volume to material quantities based on your mix ratio and yield.
Is this suitable for structural design?
No. This is a quantity estimator for planning and purchasing. Structural design should be done by qualified professionals according to local code.