CalcLibrary

Brick Wall Calculator

Estimate how many bricks and how much mortar to buy for a wall before you order. Enter the wall size, openings, brick dimensions, joint thickness, wall thickness assumption, and waste to get a purchase-ready planning estimate.

m²
%
Examples

A 6 m by 1.8 m garden wall, single-skin, with custom brick dimensions, 10 mm joints, and 5% waste.

Bricks to buy
672
Required bricks before waste
640
Estimated mortar volume
0.2 m³
Gross wall area
10.8 m²
Net wall area
10.8 m²
Thickness: single-skin
1.00×

Bricks and mortar already include 5% waste. Mortar is still a planning estimate — bond pattern, cuts, and workmanship can move the real amount.

Planning estimate only — not structural advice. Bond pattern, workmanship, cuts, and local requirements can change the real brick and mortar quantity.

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Examples

How It Works

Formula

Ag=Lw⋅HwA_g = L_w \cdot H_w

An=Ag−AoA_n = A_g - A_o

Am=(Lb+j)(Hb+j)A_m = (L_b + j)(H_b + j)

N1=AnAmN_1 = \frac{A_n}{A_m}

N=⌈N1⋅t⌉N = \lceil N_1 \cdot t \rceil

M=(An⋅Dw−N1⋅t⋅Vb)⋅(1+w100)M = \left(A_n \cdot D_w - N_1 \cdot t \cdot V_b\right) \cdot \left(1 + \tfrac{w}{100}\right)

Variables

LwL_w

Wall length(m)

HwH_w

Wall height(m)

AgA_g

Gross wall area before openings(m²)

AoA_o

Opening area removed from the wall face(m²)

AnA_n

Net wall area left to build(m²)

LbL_b

Brick length(m)

HbH_b

Brick height(m)

DwD_w

Assumed wall depth(m)

VbV_b

Volume of one brick(m³)

jj

Mortar joint thickness(m)

AmA_m

Effective brick face area including one joint each way(m²)

N1N_1

Single-skin brick count before rounding(bricks)

tt

Wall-thickness factor (1, 2, or custom)(×)

NN

Required bricks before waste(bricks)

MM

Mortar volume estimate after waste(m³)

ww

Waste allowance(%)

Enter the wall length and height, then choose how to subtract openings. The calculator removes opening area from the gross wall face, builds an effective brick module from brick length + one joint and brick height + one joint, divides the net face area by that module to get a single-skin brick count, scales it by the selected wall-thickness factor, rounds to whole bricks, and then applies waste. Mortar is estimated from net wall volume minus total brick volume, then increased by the same waste allowance.

Frequently Asked Questions

01Does this subtract doors and windows automatically?
Yes, if you enter them. Choose either one total opening area or opening rows. The calculator subtracts that area from the gross wall face before counting bricks.
02What does single-skin or double-skin mean here?
It is a buying simplification, not a bond-pattern simulator. Single-skin uses one layer of face-area logic. Double-skin simply doubles that count. Custom thickness lets you scale from brick depth or a direct multiplier.
03How is mortar estimated?
The calculator takes net wall volume, subtracts the total brick volume implied by the face-area count and thickness factor, then applies the same waste percentage. Real mortar use still moves with bond pattern, workmanship, cuts, and site practice.
04Should I use the exact brick size from my supplier?
Yes. This tool does not assume a national standard size. Enter the length, height, and depth from the brick you actually plan to buy.
05Is this structural advice?
No. It is a planning estimate for ordering material. It does not replace structural design, engineering review, contractor judgment, or local code checks.

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