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Free & Instant Estimate

Drywall
Calculator

Calculate how many drywall sheets you need, plus joint compound, screws, tape, and total material costs for any room.

100% FreeWalls & CeilingInstant Results
Room Dimensions (feet)
Ceiling Height: 8 ft
7 ft12 ft
Openings (subtracted from total)
Drywall Type

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How It Works

Get your drywall estimate in three simple steps using this drywall square footage calculator.

Enter Room Dimensions

Input your room length, width, and ceiling height in feet. Select whether you need drywall for the ceiling too.

Adjust Openings & Type

Specify the number of doors and windows to subtract from the total. Choose between standard, moisture resistant, or fire rated drywall.

Get Your Estimate

Instantly see total square footage, sheets needed, supplies list, and a material cost range based on your drywall type.

Drywall Type Comparison (2026)

Compare cost, features, and best-use locations for the three most common drywall types used in this drywall estimate calculator.

TypeCost/SheetThickness
Standard (White Board)$12–$181/2"
Moisture Resistant (Green/Purple Board)$14–$221/2" - 5/8"
Fire Rated (Type X)$18–$305/8"

Prices reflect material cost per 4x8 sheet. Installation labor typically adds $1.50–$3.50 per sqft depending on location and complexity.

Tips for Accurate Drywall Estimation

Whether you are a DIY homeowner or a contractor, these tips will help you get the most out of this drywall material calculator and avoid costly mistakes on your project.

Measure Twice, Order Once

Double-check all room dimensions before entering them. A small measurement error multiplies across the full perimeter and can throw off your drywall sheet calculator results.

Account for Waste

Plan to buy 10-15% extra sheets beyond what the calculator shows. Off-cuts around outlets, corners, and fixtures add up quickly on real job sites.

Choose the Right Type

Standard drywall works for most rooms. Use moisture resistant board in wet areas like bathrooms and kitchens, and fire rated (Type X) wherever building codes require it.

Stack Sheets Flat

Store drywall sheets flat on a clean, dry surface. Leaning sheets against a wall for extended periods can cause bowing and damage that wastes material.

Plan Your Layout

Hang sheets horizontally in most residential applications — this creates fewer joints and is easier to tape. Run sheets perpendicular to ceiling joists overhead.

Match Ceiling Height to Sheet Size

For 8-foot ceilings, standard 4x8 sheets fit perfectly. For 9 or 10-foot ceilings, consider 4x10 or 4x12 sheets to reduce horizontal seams.

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Frequently Asked Questions

Common questions about drywall estimation, materials, and installation answered.

The drywall calculator takes your room length, width, and ceiling height to compute the total wall area (perimeter times height). It subtracts standard openings for doors (21 sqft each) and windows (15 sqft each), then divides by 32 sqft per standard 4x8 sheet to determine how many sheets you need. It also estimates joint compound, screws, and tape quantities.
To use this drywall calculator for walls only, leave the 'Include ceiling drywall' checkbox unchecked. The calculator will compute wall area as the room perimeter multiplied by the ceiling height, minus any door and window openings. This gives you the exact drywall square footage needed for walls alone.
Check the 'Include ceiling drywall' option in the calculator. The ceiling area is calculated as room length times room width. This area is added to the wall area to give you a combined total for both walls and ceiling, so you can order all your drywall materials at once.
For a standard 12x12 room with 8-foot ceilings, the wall area is 384 sqft (48 ft perimeter times 8 ft height). Subtracting one door (21 sqft) and two windows (30 sqft) gives about 333 sqft, which requires approximately 11 standard 4x8 sheets. Add the ceiling and you would need roughly 16 sheets total.
Standard drywall ($12-$18/sheet) works for most interior walls and ceilings. Moisture resistant drywall ($14-$22/sheet), often called greenboard or purple board, is designed for bathrooms, kitchens, and laundry rooms where humidity is higher. Fire rated drywall ($18-$30/sheet), or Type X, contains glass fibers for added fire resistance and is required by code in garages, furnace rooms, and shared walls between units.
As a general rule, you need about 1 box of joint compound per 480 sqft of drywall, 1 pound of screws per 400 sqft, and 1 roll of tape per 300 sqft. This drywall material calculator computes these automatically based on your room dimensions so you can purchase the right quantities.
Yes, it is standard practice to order 10-15% more drywall than the calculated amount. Extra material accounts for cutting waste, mistakes, damaged sheets during transport, and off-cuts around outlets and fixtures. Our drywall sheet calculator rounds up to the nearest full sheet, which already provides some buffer.
This free drywall calculator provides accurate estimates for standard rectangular rooms. It uses industry-standard deductions for doors (21 sqft) and windows (15 sqft) and standard 4x8 sheet sizing. For rooms with unusual shapes, vaulted ceilings, or non-standard openings, you may need to adjust the results or consult a professional.

Planning a full renovation?

Use our Home Addition Cost Calculator to estimate bedroom, bathroom, kitchen, and second-story expansion budgets alongside your drywall project.

Home Addition Calculator

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