Professional Brick Estimation — Built for Real Projects
Accurate, detailed estimates for home builders, contractors, and DIY enthusiasts
Whether you're planning a garden wall, a new build, or a full house extension, getting your brick count right saves money and avoids costly mid-project supply runs. This calculator handles wall area, room perimeters, mortar estimation, cost breakdowns, and waste allowances — all in one place.
Brick Calculator
Choose a calculation mode, enter your dimensions, and get an instant detailed estimate
Waste 10% is recommended for most jobs.Project Summary
Calculation Breakdown
Mortar & Materials Estimate
Order Quantities
Full Project Details
How to Calculate How Many Bricks You Need
A complete guide to brick quantities, sizes, mortar, and waste — for DIY builders and professionals alike
Calculating bricks starts with understanding brick density — the number of bricks needed per square metre (or square foot) of wall face. This depends entirely on the size of the brick and the thickness of the mortar joint.
For a standard UK metric brick (215 × 65 mm face) with a 10 mm mortar joint, each brick + joint occupies 225 × 75 mm = 0.016875 m². Since 1 m² ÷ 0.016875 = 59.26 ≈ 60 bricks per m² for a single-skin (half-brick) wall. Double this for a full-brick (215 mm thick) double-skin wall.
Once you know the bricks per m², the rest is simple: measure your total wall area, subtract any openings (doors, windows), multiply by the brick density, then add your waste allowance (5–15% depending on complexity). This calculator handles all these steps automatically and instantly.
Brick Size Reference Table — All Standard Sizes & Bricks Per m²
Standard brick dimensions worldwide, mortar joint sizes, and calculated brick densities
| Brick Type | Length × Height (mm) | Thickness | Joint (mm) | Bricks/m² (½ brick wall) | Bricks/m² (full wall) |
|---|---|---|---|---|---|
| UK Standard / Metric | 215 × 65 | 102.5 mm | 10 | 59–60 | 118–120 |
| UK Metric (200 series) | 200 × 100 | 100 mm | 10 | 47–48 | 94–96 |
| US Modular | 194 × 57 | 92 mm | 10 | 70–72 | 140–144 |
| US Standard (King) | 194 × 70 | 92 mm | 10 | 57–58 | 114–116 |
| Australian Standard | 230 × 76 | 110 mm | 10 | 52–55 | 104–110 |
| European (NF) | 220 × 65 | 100 mm | 10 | 58–60 | 116–120 |
| Indian Standard | 190 × 90 | 90 mm | 10 | 49–51 | 98–102 |
| Engineering Brick | 215 × 65 | 102.5 mm | 10 | 59–60 | 118–120 |
| Jumbo / Oversized | 250 × 75 | 120 mm | 10 | 42–44 | 84–88 |
| Thin Brick / Slip | 215 × 50 | 20 mm | 6 | 78–80 | N/A |
How to Use This Brick Calculator — Step-by-Step Guide
Complete instructions for all five calculator modes with professional tips
- 1
Choose Your Calculator Mode
Wall Area — the most common mode. Enter height, length, brick type, and wall thickness. Add any openings. Room / House — enter room dimensions and the calculator computes total perimeter wall area automatically. Custom Brick — for non-standard bricks, enter exact dimensions. Mortar Only — estimate cement and sand quantities from a known brick count. Cost Estimator — calculate total material and labour costs.
- 2
Measure Your Wall Accurately
For the Wall Area mode, measure the total height (floor to top of wall, including any DPC or footings) and total length of the wall. For irregular walls, break them into rectangles and add them up. Always measure at the face of the wall, not through corners or returns.
- 3
Add All Openings
Use the "Add Opening" button to deduct every door, window, or archway. Click the button for each opening, enter its width and height, and the calculator will subtract those areas from the brick total. A standard UK door is 0.9 × 2.1 m; a typical window is 1.2 × 1.2 m.
- 4
Select Waste Percentage
Always order more bricks than the theoretical calculation suggests. Choose 5% for simple, straight walls; 10% for most domestic jobs (recommended default); 15% for complex projects with lots of cutting; 20% for decorative feature walls, curved walls, or complex patterns like herringbone.
- 5
Review the Mortar & Cost Estimates
The results panel shows cement bags, sand tonnes, and a cost breakdown. Use the Mortar Only mode to fine-tune your mortar estimate if you're using a non-standard joint size or mix ratio. The Cost Estimator includes labour as well as materials.
Types of Bricks — Which Brick Is Right for Your Project?
A guide to brick classifications, grades, uses, and how they affect your quantity calculations
Facing Bricks
The most visible type — used for the outer face of walls where appearance matters. Available in hundreds of colours, textures, and finishes. Price varies widely: £0.50–£2.50 each. Smooth, sand-faced, textured, and tumbled varieties all have slightly different coverage due to size tolerances.
Engineering Bricks (Class A & B)
Dense, low-porosity bricks designed for structural and civil engineering work — manholes, bridges, retaining walls, damp-proof courses, below-ground work. Class A (≤4.5% water absorption) and Class B (≤7%) are defined by BS EN 771-1. Same size as standard bricks but heavier.
Common Bricks (Wire-cut / Flettons)
Utility bricks for internal walls, cavity walls, and anywhere not visible. Less attractive but perfectly structural. Flettons are the most common type in the UK, made from Jurassic clay in the Midlands. Cheaper than facing bricks: typically £0.30–£0.60 each.
Reclaimed & Handmade Bricks
Used for heritage projects, extensions matching existing brickwork, and premium garden features. Handmade bricks have slight size variations (±3–5 mm), meaning you may need slightly fewer due to thicker joints compensating for variation. Always allow 15–20% waste for reclaimed bricks.
Concrete / Calcium Silicate Bricks
Made from sand and lime under pressure. Very consistent in size and colour — great for internal blockwork and structural walls. Typically 215 × 65 mm like clay bricks, so coverage is identical. Often cheaper than clay facing bricks but less weather-resistant.
Perforated / Cellular Bricks
Have holes through the header face to reduce weight, improve thermal performance, and allow better mortar bonding. Common in Germany and Europe. The holes don't affect the face dimensions, so bricks per m² calculations are identical to solid bricks of the same face size.
Professional Bricklaying Tips & Common Mistakes to Avoid
Expert advice that saves time, money, and avoids expensive mistakes on your brickwork project
Always Order 10% Extra
Even on straightforward jobs, ordering exactly the right number of bricks is a mistake. Bricks are fired in batches; a second delivery will often have a slightly different colour shade, creating a visible patch on your wall. Order all bricks at once with a 10% buffer.
Dampen Bricks Before Laying
Dry clay bricks absorb water too quickly from mortar, weakening the bond. Dampen (not saturate) bricks before laying in warm, dry weather. Engineering bricks should not be dampened — their low absorption is intentional. Never wet concrete bricks.
Don't Lay Below 2°C
Mortar can freeze before it cures, permanently weakening the joint. Below 2°C, cover new brickwork with insulating blankets. Above 32°C, protect from direct sun to prevent too-rapid drying. Ideal temperature range for bricklaying is 5–30°C.
Use a Story Pole (Gauge Rod)
Mark a timber batten with brick course heights (brick + joint, e.g. 75 mm for UK standard). Use it to check you're maintaining consistent joint thickness as you build up. Inconsistent joints are the most common cause of walls going out of level over multiple courses.
Mix Bricks from Multiple Packs
When opening multiple packs of the same brick, open 2–3 packs simultaneously and mix them together as you lay. This distributes any minor colour variation (known as "batch variation") evenly across the wall, preventing visible patches or banding.
Strike Joints While Still Green
Strike (finish) mortar joints when the mortar is "green" — firm but not fully hard, typically 45–90 minutes after laying depending on temperature. Leaving it too long results in poor joint profiles and is much harder to finish neatly. Use a pointing tool or bent copper pipe for a concave ("bucket handle") joint.
Brick Calculator FAQ — Frequently Asked Questions
Answers to the most common questions about brick quantities, sizes, mortar, and costs