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Drywall Calculator

Calculate 4x8 or 4x12 drywall sheets, joint compound, tape, and screws for walls and ceilings.

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Input Parameters

Enter details for calculation.

Drywall Sheets

38 sheets
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Expert Tip

4x8 sheets cover 32 sq ft; 4x12 sheets cover 48 sq ft. Add 10% extra for trimming waste.

Calculation Methodology & Details

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Formula

Sheets = Ceil( Total Area (sq ft) / Sheet Area (sq ft) ) × 1.10 (Waste)

Applies standard construction engineering calculation formulas.

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Important Disclaimer

The calculations provided are for educational and structural planning purposes. Always consult a qualified general contractor or structural engineer for site-specific verification.

How to Calculate Step-by-Step

Follow these steps to complete the calculation:

1

Step 1

Measure total wall and ceiling square footage.

2

Step 2

Select drywall sheet size (4x8 ft or 4x12 ft).

3

Step 3

Divide total area by sheet coverage and add 10% waste allowance.

Detailed Insights & Expert Guide

ℹ️ About this Calculation

Computes total drywall panels (gypsum board), joint compound (mud), drywall tape, and screws required for wall and ceiling drywall installation.

Variable Glossary

Input

Surface Area

Combined wall and ceiling area in square feet.

Parameter

Sheet Dimensions

Standard 4ft x 8ft (32 sq ft) or 4ft x 12ft (48 sq ft) panels.

FAQ

How many drywall sheets for a 12x12 room with 8ft walls?
Walls equal 384 sq ft + ceiling 144 sq ft = 528 sq ft. Requires about 17 to 18 sheets of 4x8 drywall.
How much joint compound (mud) is needed per sheet?
You need approximately 1 gallon of joint compound per 100 sq ft (or ~1/3 bucket per 4x8 sheet).
How many screws per drywall sheet?
A standard 4x8 sheet requires about 32 to 36 drywall screws spaced 12 inches on center.