How many bricks for a 20m × 3m wall?

A 20m × 3m wall is 60 square metres. At 59.3 bricks per square metre for a standard 215 by 65 millimetre brick with a 10 millimetre joint, that is 3556 bricks for a single skin, or 3912 once the usual ten percent is added for breakage and cuts. For a full-brick wall of two wythes, double it to about 7824.

How many packs of bricks for a 20m × 3m wall?

Around 8 packs, taking a pack as 500 bricks — though pack sizes vary from about 400 to 500 by manufacturer, so check the delivery note. Order all 8 together so they come from one batch — colour varies between firings, and a top-up delivered later will be visible on the finished wall.

How long does a 20m × 3m wall take to build?

At 400 to 600 bricks a day for an experienced bricklayer, 3912 bricks is roughly 8 to 10 days of laying for one person on straightforward work. A capable amateur laying 150 to 200 a day should allow 20 to 27 days. Openings, returns and cutting slow it down considerably more than height does.

What is a 20m × 3m wall usually for?

Full site boundary. The size decides more than the brick count: it decides whether the wall needs a scaffold, whether it needs movement joints, and whether a single skin is structurally adequate. At three metres this is above comfortable working height, so it needs a tower or scaffold and wants building in two lifts. And at this length it needs a movement joint — clay brickwork wants one every ten to twelve metres.

What bond should I use?

Stretcher bond — every brick laid lengthwise, each course offset by half a brick — is the default for single-skin work and the only sensible choice for a cavity wall outer leaf, because there is nothing behind to bond into. Flemish and English bonds alternate headers and stretchers to tie two wythes together, so they need a full-brick wall and roughly double the bricks. Choose before ordering rather than after: the bond decides the wall thickness and the wall thickness decides the count.

How do I finish the joints?

Tool them while the mortar is thumbprint-hard — firm enough to hold a shape, soft enough to compress. A bucket-handle or weather-struck profile compresses the mortar surface and sheds water, which is why both outlast a flush joint on an exposed wall. A recessed joint looks striking and holds water on every ledge, so it belongs indoors or in sheltered positions only. Leave the tooling too late and the joint has to be raked out and pointed again.

Can I lay bricks in cold weather?

Not below about three degrees and falling. Mortar gains strength by hydration, which slows sharply as it cools and stops altogether near freezing, and mortar that freezes before it has set is permanently damaged rather than merely delayed. The wall will look fine and be weak. If work has to continue, cover it, use warm water in the mix, and protect fresh work overnight — but the honest answer is usually to stop and wait.

How many bricks are there in a square metre?

About 59.3 for a standard 215 by 65 millimetre brick with a 10 millimetre joint, which most people round to 60. The figure comes from the module rather than the brick itself: each brick occupies 225 by 75 millimetres of wall once its joint is counted. Working from the bare brick face gives 71.6 per square metre, about 21% too many, which is the most common way a brick order comes out oversized.

What is a wythe and do I need one or two?

A wythe is a single thickness of brick. One wythe — a half-brick wall — is 102.5 millimetres thick and suits the outer leaf of a cavity wall or a low garden wall. Two wythes make a full-brick wall at 215 millimetres, which is what free-standing walls above about a metre and a half need for stability. Setting the wythes correctly matters more than any other input here, because it doubles the brick count.

Bricks for a 20m × 3m Wall

Sixty square metres is the largest wall on this list and the point at which the question stops being how many bricks and starts being whether this should be brick at all. Twenty metres at three metres high is close to four thousand bricks, a week and a half of skilled laying, a substantial foundation, and a structure t..

WALL DIMENSIONS

BRICK TYPE

215 × 65mm face · 10mm joint · 59.3 bricks/m²

WALL THICKNESS

WALL HEIGHT (metres)

WALL LENGTH (metres)

OPENINGS — doors + windows (m² total)

m²

Standard door ~1.9m² · Standard window ~1.2m² · Enter 0 if none

WASTE ALLOWANCE (%)

5% = simple rectangular wall · 10% = standard · 15% = complex cuts / patterns

PRICE PER 1,000 BRICKS (optional)

US common face brick: $400–$900/1,000 · Premium: $1,000–$2,500+

RESULTS — UK Standard, 1 wythe

BRICKS NEEDED (incl. 10% waste)

3,912

bricks

MORTAR BAGS (80lb)

NET AREA

60.0 m²

BRICK MATERIAL COST

$2,738

at $700/1,000 bricks

WALL PATTERN — UK Standard

WALL SUMMARY

Gross wall area60.00 m²

Net area (less openings)60.00 m²

Bricks/m² (this type)59.26

Bricks net (no waste)3,556

Bricks + 10% waste3,912

Mortar (pre-mix 80lb bags)98

Mortar volume2.229 m³

Brick material cost$2,738

BRICK SIZE REFERENCE

US Standard203.2×57.15mm · 70.5/m²

US Modular194×57mm · 73.9/m²

UK Standard215×65mm · 59.3/m²

Australia Standard230×76mm · 48.4/m²

Metric Modular200×100mm · 43.3/m²

WASTE GUIDE

Simple rectangular walls, no cuts

Standard walls with few openings

10%

Typical residential — recommended

15%

Complex shapes, patterns, arches

Created with❤️byeaglecalculator.com

HOW TO USE

1
The calculator opens with 20 metres long by 3 metres high already entered, in metric, with a standard 215 by 65 millimetre brick selected.
2
Change the brick type if yours differs — US Standard, US Modular and Australian sizes are all there, and the coverage changes substantially between them.
3
Set the wythes to two if this is a full-brick wall rather than a single skin. That doubles the count, and for a free-standing wall at 3 metres it is usually the right setting.
4
Enter any openings as an area to deduct. On a wall this size a single door or window is a meaningful fraction of the total.

WORKED EXAMPLE

A 20m × 3m wall in standard 215 by 65 millimetre brick with a 10 millimetre joint, single skin. The area is 20 × 3 = 60 square metres. Each brick occupies a module of 225 by 75 millimetres — the brick plus one joint on two sides — which is 0.016875 square metres. One divided by that gives 59.26 bricks per square metre. So 60 × 59.26 = 3556 bricks for the bare wall. Adding ten percent for breakage and cuts brings the order to 3912. Note what happens if you work from the brick rather than the module: 215 by 65 is 0.013975 square metres, giving 71.6 bricks per square metre and 4723 for this wall. That is about 21% too many — on this wall, 811 bricks bought for nothing. For a full-brick wall of two wythes, double the figure to 7824.

FREQUENTLY ASKED QUESTIONS

RELATED CALCULATORS

Bricks for 3m × 2m Wall Calculator

Calculate instantly

Bricks for 4m × 3m Wall Calculator

Calculate instantly

Bricks for 2m × 2m Wall Calculator

Calculate instantly

Stone Cladding Calculator

Calculate instantly

MORE BRICKLAYING CALCULATORS

Brick Calculator

Calculate instantly →

Concrete Block Calculator

Calculate instantly →

Mortar Calculator

Calculate instantly →

Wall Area Calculator

Calculate instantly →

Stone Cladding Calculator

Calculate instantly →

Cement Blocks Per Square Metre

Calculate instantly →

Bricks for 2m × 2m Wall Calculator

Calculate instantly →

Bricks for 3m × 2m Wall Calculator

Calculate instantly →

Bricks for 4m × 2m Wall Calculator

Calculate instantly →

Bricks for 4m × 3m Wall Calculator

Calculate instantly →

Bricks for 5m × 3m Wall Calculator

Calculate instantly →

Bricks for 6m × 3m Wall Calculator

Calculate instantly →

Bricks for 8m × 3m Wall Calculator

Calculate instantly →

Bricks for 10m × 3m Wall Calculator

Calculate instantly →

Bricks for 15m × 3m Wall Calculator

Calculate instantly →

Was this calculator helpful?

Last updated: July 29, 2026 · Formula verified by EagleCalculator team · Eagle-eyed accuracy for every calculation.