Quantity is the same; thickness follows the system (fire/acoustic) per design.

How many sheets for 130 sq ft?

A 4×8 ft sheet covers 32 sq ft: 5 sheets with 10% waste for one side.

Do I count both sides of a partition?

Yes: a partition lined both sides doubles the board area.

Do I deduct doors and windows?

Big openings yes; small ones are better left in — offcuts cover them.

What about 4×8 ft sheets?

A 1.2×2.5 m board is ≈4×8 ft (about 32 sq ft). Switch to Imperial to enter feet instead of metres.

Drywall calculator (boards)

Boards by m² and sides. Standard 1.2×2.5 m board (3 m²), rounded up.

Purchase quantity

7.33 board

Net measurement: 6.67 board · Waste 10 %

3.937×8.202 ft boards (32.292 ft²)8 board
Board area258.334 ft²

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Your prices per language/currency. Used when you enable “Use my prices” in calculators. My prices →

Calculate labour, margin & GST

Shopping list

What to buy for this calculation. Look up each material at your store.

3.937×8.202 ft boards (32.292 ft²) · 8 boardSearch at Amazon

How it's calculated (visible formula)

net_boards = area × sides ÷ (width × length); buy = ceil(net × (1+waste))

Net geometric measurement, no waste.
Adjustable waste % for cuts and breakage.
Purchase rounded up to sellable units (boxes, bags, buckets, boards).

See methodology and formula versions

Worked example: 12 m² liner, 1 side

12 ÷ 3 = 4 boards net
+10% → 4.4

→ 5 boards.

Common mistakes

Counting one side of a partition.
Deducting small openings that offcuts would cover.

From calculation to quote

Add labour, overhead and your margin, and generate the professional PDF.

Create quote Calculate margin & GST

FAQs

12.5 or 15 mm board?: Quantity is the same; thickness follows the system (fire/acoustic) per design.
How many sheets for 130 sq ft?: A 4×8 ft sheet covers 32 sq ft: 5 sheets with 10% waste for one side.
Do I count both sides of a partition?: Yes: a partition lined both sides doubles the board area.
Do I deduct doors and windows?: Big openings yes; small ones are better left in — offcuts cover them.
What about 4×8 ft sheets?: A 1.2×2.5 m board is ≈4×8 ft (about 32 sq ft). Switch to Imperial to enter feet instead of metres.

Maintained by Srikanta M · Formula v1.0.0 · Verified 2026-09-10 · Updated 2026-09-10 · Limits: quantity estimation, not structural design or site supervision.