How many bricks are needed for a 20 ft by 10 ft wall?

A 20 ft by 10 ft wall is 200 sq ft. Using a standard UAE brick of 230 x 115 x 75 mm with a 10 mm mortar joint, the face area per brick is about 0.153 sq ft, giving roughly 1,308 bricks. Adding 5 percent wastage brings the purchase quantity to about 1,374 bricks.

What is the standard brick size in Pakistan?

The standard Pakistani brick under PBQS is 9 x 4.5 x 3 inches, which equals 228.6 x 114.3 x 76.2 mm. A smaller 215 x 102 x 65 mm brick is also in circulation.

What is the standard brick size in India?

IS 1077 specifies a modular brick of 190 x 90 x 90 mm. With a 10 mm mortar joint the nominal size becomes 200 x 100 x 100 mm. A flat 190 x 90 x 40 mm brick is also standard.

How much cement and sand does a cubic foot of concrete need?

Multiply the wet volume by the dry factor of 1.54 per ACI 318, then split by the mix ratio. For M20 concrete at 1:1.5:3, one cubic foot of wet concrete needs about 0.28 cu ft of cement, 0.42 cu ft of sand and 0.84 cu ft of aggregate.

How many square feet does a gallon of paint cover?

Emulsion covers about 325 sq ft per gallon, primer about 375 sq ft, oil-based paint about 275 sq ft and textured paint about 150 sq ft. Divide the net wall area by the coverage rate and multiply by the number of coats.

What is the maximum stair riser height allowed?

IRC 2021 section R311.7.4 sets a maximum riser height of 7 and three quarter inches and a minimum tread depth of 10 inches for residential stairs.

Is the Bhewal construction calculator free?

Yes. Every calculator is free with no signup, no account and no fees. It runs entirely in the browser and works offline once loaded.

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Room-by-room design with house layout styles, wall sharing, door/window deductions.

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3 Brick Standards

GCC / Gulf, Pakistan (PBQS), India IS-1077 — pre-loaded correct dimensions.

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Room-by-room layout with wall sharing, door & window deductions

🧱 Step 1: Brick / Block Standard

Length (mm)

mm

Width (mm)

mm

Height (mm)

mm

🏡 Step 2: House Layout Style

Choose how rooms connect — shared walls are counted only once, saving bricks.

▬▬▬

Linear

Rooms in a row

⌐

L-Shape

Corner layout

∪

U-Shape

3-sided layout

⬛

Square/Grid

Enclosed court

□ □

Detached

All walls separate

⚙️ Step 3: Default Settings

Default Wall Height

ft

Applied to all rooms unless overridden

Mortar Joint

mm

Wastage %

%

🚪 Step 4: Add Rooms

Room Name	Length	Width	Height	Doors	Windows	Gates

Height optional — uses default if empty

📐 Step 5: Default Opening Sizes

Door Width

ft

Door Height

ft

Window Width

ft

Window Height

ft

Gate Width

ft

Gate Height

ft

📊 Whole House Results

Room	Area (sqft)	Openings	Net Area	Bricks	Purchase

⚠️ Shared walls counted once per layout style. Actual bricks vary with mortar consistency and wall details. Consult a licensed engineer.

📐 Units:

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Brick / Block Wall

International standards — GCC, Pakistan PBQS, India IS-1077, US Modular

Brick Standard

Length (mm)

mm

Width (mm)

mm

Height (mm)

mm

Wall Length

ft

Wall Height

ft

Mortar Joint

mm

Wastage %

%

Openings (Deductions)

No. of Doors

nos

Door W × H

ft

No. of Windows

nos

Window W × H

ft

Labour Cost

Rate (per sqft)

$

Face Area = (L+joint)×(H+joint) sqftNet bricks = Net Wall / Face AreaPurchase = ceil(Net × (1+waste%))Mortar = (Purchase/1000) × 8 cuftDry mortar = Mortar × 1.33

📐 Units:

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Concrete / Slab

ACI 318 · Dry factor 1.54 · M15/M20/M25/M30

Mix Grade

Length

ft

Width

ft

Depth / Thickness

ft

No. of Elements

nos

Wastage %

%

Labour

Wet Vol = L×W×D×qty cuftPurchase = Wet × (1+waste%)Dry Vol = Purchase × 1.54 (ACI 318)Cement = Dry × c/(c+s+a) ÷ 1.25 cuft/bagSand = Dry × s/(c+s+a) cuftAggregate = Dry × a/(c+s+a) cuft

📐 Units:

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Plaster

Internal & External · 12mm / 20mm · Dry factor 1.54

Wall Length

ft

Wall Height

ft

Thickness

Mix Ratio

Openings Area

sqft

Wastage %

%

Labour

📐 Units:

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Paint

Emulsion 325 · Primer 375 · Oil 275 · Textured 150 sqft/gal

Paint Type

Room Length

ft

Room Width

ft

Ceiling Height

ft

No. of Coats

Doors

nos

Windows

nos

Paint Ceiling?

Labour

📐 Units:

🟫

Flooring / Tiles

12×12 · 18×18 · 24×24 · Custom size

Tile Size

Tile Width (in)

in

Tile Height (in)

in

Room Length

ft

Room Width

ft

Deduct Area

sqft

Wastage %

%

Tiles per Box

nos

Labour

📐 Units:

🏚️

Roofing

Pitch multiplier table · Squares · Bundles

Roof Length

ft

Roof Width

ft

Overhang per Side

ft

Pitch

Wastage %

%

Labour

📐 Units:

🔩

Steel / Rebar

CRSI Table · #3 to #8 · ACI 318

Bar Size

Bar Length

ft

No. of Bars

nos

Wastage %

%

📐 Units:

🪜

Staircase

IRC 2021 R311.7.4 · Max riser 7¾ in · Min tread 10 in

Floor-to-Floor Height

ft

Desired Riser Height

in

Tread Depth

in

Stair Width

ft

📐 Units:

⛏️

Excavation

Swell factors: Sand 15% · Clay 25% · General 30% · Rock 50%

Soil Type

Length

ft

Width

ft

Depth

ft

No. of Excavations

nos

📐 Units:

🪣

Mortar Mix

Dry factor 1.33 · Cement:Sand ratios 1:3 to 1:6

Wet Volume Required

cuft

Mix Ratio

Bag Weight

Wastage %

%

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All formulas follow recognized standards: ACI 318 (concrete), CRSI (steel), IRC 2021 (staircases), IS-1077 (India bricks), PBQS (Pakistan). Designed for engineers, contractors, architects and homeowners.

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