What thickness drywall should I use?

1/2 inch is standard for most walls and ceilings. 5/8 inch is used for fire-rated assemblies (garages, between floors). 3/8 inch is used for curved walls. 1/4 inch for double-layer applications.

How much does drywall cost?

A 4×8 sheet (32 sq ft) typically costs $12–$18. Specialty types (moisture-resistant, fire-rated) cost more. Add $1–$2/sq ft for professional installation including finishing.

Drywall Calculator — Sheets & Square Footage

Quick answer: Enter room dimensions and opening count to calculate drywall sheets needed with waste factor.

Calculate the number of 4×8 drywall sheets needed to cover all four walls of any room. Automatically subtracts door and window openings and adds a standard 10% waste factor.

Last reviewed: April 2026Report an error

Room Length (ft)

Room Width (ft)

Wall Height (ft)

Door Count

Window Count

Sheets Needed (4×8)

297.0 sq ft — 10 sheets needed, 11 with waste.

Square Feet

297.0

Sheets Needed (4×8)

Sheets with Waste

How to Use This Drywall Calculator

1Enter room length, width, and wall height.
2Enter the number of doors and windows.
3Read total square footage, sheets needed, and sheets with waste.

Frequently Asked Questions

: 1/2 inch is standard for most walls and ceilings. 5/8 inch is used for fire-rated assemblies (garages, between floors). 3/8 inch is used for curved walls. 1/4 inch for double-layer applications.
: A 4×8 sheet (32 sq ft) typically costs $12–$18. Specialty types (moisture-resistant, fire-rated) cost more. Add $1–$2/sq ft for professional installation including finishing.

</> Embed this calculator on your website

<iframe src="https://calqpro.com/calculators/drywall-calculator" width="100%" height="600" frameborder="0" title="Calqpro Calculator" loading="lazy"></iframe>
<p>Powered by <a href="https://calqpro.com">Calqpro</a></p>

Drywall Calculator — Sheets & Square Footage

How to Use This Drywall Calculator

Frequently Asked Questions

Related Calculators