1. Net wall area

Start with the gross wall area for your shape, then subtract every opening:

Worked example: a 6.0 m × 2.4 m wall = 14.4 m². Remove one 0.9 m × 2.1 m door (1.89 m²) and one 1.2 m × 1.2 m window (1.44 m²). Net area = 14.4 − 1.89 − 1.44 = 11.07 m².

2. Bricks per unit area (single skin)

A brick laid as a stretcher shows its length × height face. Add the mortar joint to both dimensions to get the area one brick occupies on the wall face:

UK example (215 × 65 mm face, 10 mm joint): 1 ÷ (0.225 × 0.075) = 59.3 ≈ 60 bricks/m². US modular (8 × 2⅔ in nominal): ≈ 6.86 bricks/ft².

3. Total bricks (with wall thickness & waste)

Multiply by the number of half-brick "skins" in the wall thickness, then add waste. A single-skin wall is ×1, a one-brick wall is ×2, and so on.

Example: 11.07 m² × 60 × 1 skin = 664 bricks. With 10% waste: 664 × 1.10 = 731 bricks to buy.

4. Mortar volume

The mortar fills the gaps between bricks — it is the wall volume minus the volume of the bricks themselves:

The 1.30 bulking factor accounts for the air voids that disappear when dry sand and cement are mixed and compacted. Plan for roughly 0.45–0.60 m³ of mortar per 1,000 standard bricks.

5. Mortar bags, weight, pallets & cost

1. Standard brick size chart

2. Brick dimensions by country

3. Bricks per square foot (single skin, ⅜ in joint)

A quick field rule in the US is 7 bricks per square foot for modular brick — the calculator above uses the exact 6.86 figure and rounds the final order up.

4. Bricks per square metre (single skin, 10 mm joint)

5. Concrete & cinder block coverage

6. Mortar coverage chart (per 1,000 bricks)

Practical rule: 1 m³ of mortar lays roughly 1,800–2,000 standard bricks. The calculator computes the geometric volume (wall minus bricks) and adds your waste %, so treat the result as a minimum and round bags up.

7. Wall thickness chart

8. Brick bond comparison

Bond affects appearance and thickness, not the bricks-per-area rate. A one-brick English-bond wall uses the same brick count as any other one-brick wall of the same size.

9. Cost comparison (illustrative)

Prices vary widely by region, supplier and quantity. The calculator uses the price you enter, so paste your real quote for an accurate total.

10. Waste percentage table

11. Brick weight table

What is a brick calculator?

A brick calculator is a tool that turns a wall's dimensions into a shopping list. Instead of guessing, you enter the length and height of the wall, choose a brick size, and the calculator works out how many bricks the wall needs — then adds the mortar, the waste allowance, the number of pallets, the total weight, and the cost. It replaces a slow, error-prone hand calculation with an instant, repeatable answer.

The value of a good brick calculator is not just speed; it is accuracy and completeness. Bricklaying involves several quantities that all move together: change the joint thickness and the brick count changes; change the wall thickness and both the brick count and the mortar volume change. A calculator keeps all of these in sync. The tool on this page is built for real ordering decisions — it deducts doors and windows, lets you set a realistic waste percentage, and converts freely between metric and imperial so it works whether you are building in Manchester, Melbourne or Memphis.

Most importantly, the result is an estimate you can act on. It tells you roughly how many bricks to order and how many bags of mortar to keep on the pallet, while reminding you to confirm the final figure with your supplier — because frogs, breakages and site conditions all nudge the real number.

How brick calculations work

Every brick calculation starts with area, not volume. A brick laid in a wall presents one face to the world — for a standard stretcher that is the long side, the brick's length by its height. To find how many bricks cover a square metre or square foot of wall, you work out the area of one brick's face including its mortar joint, then divide it into the wall area.

The mortar joint matters more than people expect. A UK brick is 215 mm long and 65 mm high, but with a 10 mm joint each brick effectively occupies 225 mm × 75 mm of wall. That is why the classic figure is 60 bricks per square metre for a single-skin wall, and 120 per square metre for a one-brick (double-skin) wall. In the US, a modular brick with a ⅜-inch joint works out to about 6.86 bricks per square foot, which trades people round to seven.

From there the method is straightforward. Multiply the net wall area (after subtracting openings) by the bricks-per-area figure to get the base count. Multiply by the number of half-brick "skins" in the wall thickness — one for a half-brick wall, two for a one-brick wall, and so on. Finally, add a waste percentage and round up, because you cannot buy a fraction of a brick. The calculator on this page follows exactly this sequence and shows each intermediate figure so you can check its working.

This face-area method is deliberately chosen over a naive "wall volume ÷ brick volume" approach. The two agree for thick walls but diverge sharply for single-skin walls, where the volume method quietly over-counts. Counting by face area gives the industry rules of thumb that bricklayers actually use.

Brick sizes explained

A brick has three dimensions: length, width (also called depth or bed) and height. The face you usually see is the stretcher face — length × height. The short end is the header face — width × height. Knowing which face shows is the key to understanding both bond patterns and brick counts.

Brick sizes are quoted in two ways. The actual size is the physical brick you can hold; the nominal size includes the mortar joint, so it divides evenly into a building module. A US modular brick has an actual size of 7⅝ × 3⅝ × 2¼ inches but a nominal size of 8 × 4 × 2⅔ inches once you add the joint — which is why four courses rise a tidy eight inches. When you enter custom dimensions in the calculator, use the actual brick size and set the joint separately; the tool adds them together for you.

Heights vary more than you might think. Many countries also make a taller "engineering" or "double-height" brick to lay walls faster, and concrete blocks are far larger again — a single UK block at 440 × 215 mm covers the area of about six bricks. Choosing the right preset, or entering the right custom size, is the single biggest factor in an accurate count.

Standard brick dimensions by country

There is no single world brick. Each region settled on its own standard, usually one that suits a comfortable hand and the local module.

In the United States, the modular brick (7⅝ × 3⅝ × 2¼ in) dominates, with "standard", "queen" and "king" sizes also common. The United Kingdom and Ireland use a metric brick of 215 × 102.5 × 65 mm with a 10 mm joint. Australia and New Zealand favour a slightly larger 230 × 110 × 76 mm brick. In India and much of South Asia, a 190 × 90 × 90 mm modular brick and a 230 × 110 × 75 mm traditional brick are both widespread. Across continental Europe, the German "Normalformat" (240 × 115 × 71 mm) and the thin Dutch "Waalformaat" are typical. In the UAE and the wider Gulf, hollow concrete blocks (commonly 400 × 200 × 200 mm) do most of the work that clay bricks do elsewhere. The calculator includes presets for all of these so you do not have to remember the millimetres.

Wall thickness guide

Wall thickness is described in brick-lengths. A half-brick wall is one brick wide laid as stretchers — about 102.5 mm (4 in) thick — and is the everyday choice for garden walls and the outer leaf of a cavity wall. A one-brick wall is the length of a brick thick (about 215 mm / 9 in), strong enough for boundary and load-bearing walls. One-and-a-half and two-brick walls go thicker still for retaining structures and tall freestanding walls.

The reason thickness matters to your order is simple: each extra half-brick of thickness is effectively another skin of bricks. A one-brick wall needs twice as many bricks as a half-brick wall of the same length and height. In the calculator, the "wall thickness" selector does this multiplication for you — choose the description that matches your design, or enter a custom thickness and let the tool map it to the nearest number of skins.

Modern external walls are usually cavity walls: two leaves with an insulated air gap between them, tied together with metal wall ties. When estimating a cavity wall, treat each leaf separately — typically a brick outer leaf and a block inner leaf — and add the two counts together.

Mortar calculations

Mortar is the glue between bricks, and it fills more space than people expect. The volume of mortar in a wall is simply the wall's volume minus the volume of all the bricks in it. In practice, a single-skin brick wall needs roughly 0.25–0.30 m³ of mortar per 1,000 bricks, rising to 0.45–0.55 m³ in a one-brick wall because of the extra collar and cross joints. A useful site rule is that one cubic metre of mortar lays about 1,800–2,000 bricks.

Two things push real consumption above the geometric minimum. First, many clay bricks have a frog — an indentation in the bed face — that fills with mortar. Second, mixing, dropping and tooling all waste some material. The calculator computes the geometric volume and adds your waste percentage, so treat its mortar figure as a sensible floor and round bags up.

Translating volume into bags is where people get caught out, because "a bag of mortar" means different things. A bag of pre-mixed mortar yields only a small fixed volume — around 0.55 ft³ (about 15 litres). A bag of masonry cement mixed with sand on site makes several times more. The calculator lets you set the yield per bag, so set it to match the product you are actually buying and the bag count will be right.

Brick bond patterns

A bond is the pattern in which bricks overlap from course to course. It does two jobs: it ties the wall together structurally, and it gives the wall its character. The most common bond by far is stretcher (running) bond, where every brick shows its long face and each course is offset by half a brick. It is the natural choice for half-brick walls, cavity leaves and brick veneers.

Thicker, more decorative walls use bonds that mix stretchers and headers. English bond alternates a full course of stretchers with a full course of headers and is exceptionally strong — a traditional pick for retaining walls and engineering work. Flemish bond alternates stretcher and header within every course for a refined facade. Stack bond lines bricks up in a grid for a clean modern look but has little strength and usually needs reinforcement. Header bond shows only the short ends and suits curves and thick decorative panels.

Here is the key estimating insight: the bond does not change how many bricks a wall of a given thickness needs. A one-brick wall in English bond uses the same number of bricks as a one-brick wall in stretcher bond of the same size — the bricks are simply arranged differently. Bond affects appearance and minimum thickness, not the count, which is why the calculator treats bond as guidance and counts by thickness.

Common mistakes to avoid

The most common error is forgetting the mortar joint. Bricks are quoted at their actual size, but in the wall each one occupies a little more because of the joint around it. Count with the actual size and no joint and you will over-order by roughly 10–15%. The calculator avoids this by adding the joint to both brick dimensions before it counts.

A second classic mistake is ignoring wall thickness. People price a one-brick wall using single-skin figures and end up half short. Always confirm whether your wall is one skin or two — and remember a cavity wall has two leaves. Third, builders skip the waste allowance: bricks crack, get cut to fit, and arrive with the odd damaged unit, so 5–10% extra is not optional. Finally, many estimates forget to deduct openings on small walls and over-deduct on large ones; the calculator handles this precisely by subtracting the exact area of each door and window you enter.

Cost estimation

The cost of a brick wall is more than the bricks. A complete estimate has four parts: materials (bricks plus mortar), delivery, labour, and tax. Bricks themselves range from around $0.50 for a common facing brick to several dollars for handmade or reclaimed units, and they are usually the smaller part of the bill on a built wall. Labour is frequently the largest line — a skilled bricklayer's day rate, or a price per thousand bricks laid, adds up quickly.

The calculator's cost mode brings all four parts together. Enter the price per brick, the price per bag of mortar, a delivery charge, a labour rate per unit of wall area, and your local tax rate; it returns the material cost, the tax, the labour, the grand total and the cost per square foot or square metre. Because prices vary so much by region and supplier, the tool deliberately uses the figures you type rather than baked-in averages — paste your real quote and the total will reflect your project, not a national guess.

For budgeting, the cost-per-area figure is the most useful output: it lets you compare a quote against a benchmark and sanity-check whether you are being charged fairly before any bricks are laid.

Brick wastage

Waste is the gap between the bricks a wall theoretically needs and the bricks you must actually buy. It comes from three sources: breakage in transit and handling, cutting bricks to fit at corners and openings, and the occasional faulty unit. For a simple straight wall with good access, 5% is enough. For a typical house or garden wall with normal cutting, 10% is the standard allowance. Curved walls, arches, intricate detailing, and reclaimed or handmade bricks justify 12–15% or more, because the cut rate and breakage are higher.

It is cheaper to over-order slightly than to run out: a second small delivery costs more in carriage than the spare bricks, and a later batch may not match the colour of the first. The calculator's default 10% suits most projects; raise it for fiddly work and lower it for plain runs.

Building regulations

Brickwork is governed by building codes that vary by country, and this guide is general information rather than a substitute for them. In broad terms, regulations cover structural adequacy (will the wall stand and carry its loads), foundations (depth and type beneath the wall), movement joints in long runs, weatherproofing and cavity detailing, and — for freestanding walls — height limits beyond which engineering design or planning permission is required.

As a rule of thumb, many jurisdictions allow a half-brick freestanding wall up to roughly 600 mm high and a one-brick wall up to around 1.2–1.8 m before extra measures such as piers or reinforcement are needed, but the exact figures depend on exposure and local code. Retaining walls, which hold back soil, are treated far more strictly and usually need proper engineering. Always check the rules that apply where you are building, and consult a structural engineer for anything load-bearing or retaining.

DIY vs professional construction

Small, non-structural projects — a low garden wall, a planter, a BBQ surround — are realistic DIY work for a careful beginner who is willing to practise laying a few courses first. The skills that matter most are mixing consistent mortar, keeping courses level and plumb, and striking neat joints. Hiring or buying a spirit level, line and pins, and a brick trowel makes a visible difference to the result.

Anything structural, tall, retaining, or on show across a whole facade is usually worth a professional. A good bricklayer works faster, wastes less, and produces straighter, weather-tight work — and on load-bearing or retaining walls, getting it wrong is dangerous as well as expensive. A sensible middle path is to estimate the job with this calculator, get two or three quotes, and use the cost-per-area figure to judge them. Even if you hire out the work, an accurate material list keeps you in control of the biggest variable in the price.

Brick buying guide

When you buy, think beyond the headline price. Order from one batch where possible: bricks are fired in lots and colour can shift between them, so a single delivery gives a more uniform wall. Buy your waste up front for the same reason — matching colour later is hard. Check the brick type suits the job: facing bricks for visible work, engineering bricks where strength and low water absorption matter (such as below ground or in retaining walls), and frost-resistant bricks in cold, wet climates.

Confirm how bricks are packed and delivered. They typically arrive strapped on pallets of around 400–500 and are craned off a lorry, so make sure there is access and a firm, level place to set them down. The calculator's pallet figure helps you tell the supplier how many packs to expect and plan where they will go. Finally, keep your calculation and the delivery note together, so any shortfall or breakage claim is easy to settle.

Brick types

Bricks fall into a few broad families. Facing bricks are made to be seen, in a wide range of colours and textures, and cover most visible walls. Engineering bricks are dense and strong with very low water absorption, used where load or damp resistance matters. Common bricks are cheaper, less uniform, and intended for work that will be hidden or rendered. Handmade and reclaimed bricks bring character and are favoured in restoration, though they vary more in size and demand a higher waste allowance.

By material, most bricks are fired clay, prized for durability and colour. Concrete bricks and blocks are common for structural and backing work, and dominate in regions like the Gulf. Calcium-silicate (sand-lime) bricks offer crisp edges and pale colours. Each behaves a little differently in weight, water absorption and mortar appetite — which is exactly why the calculator lets you set the brick's dimensions, weight and joint rather than assuming one type.

Sustainability

Brick is one of the more sustainable mainstream building materials over its whole life. Fired clay bricks last for centuries, need almost no maintenance, and store and release heat in a way that can lower a building's energy use. Their main environmental cost is the energy used to fire them, but that is offset over a very long service life, and modern kilns are steadily more efficient.

The greenest brick is often a reclaimed one: reusing sound bricks from demolition avoids new firing entirely and gives a wall instant character. At end of life, clean brick can be crushed for hardcore and aggregate rather than sent to landfill. Accurate estimating plays a quiet part here too — ordering the right quantity, with a sensible rather than excessive waste margin, means fewer bricks fired, fewer delivered, and fewer left over to dispose of. A precise calculation is a small but real act of building more efficiently.