Drywall Calculator

Drywall Calculator helps you work out, in seconds, how much drywall (plasterboard / Sheetrock) and finishing material a room needs — boards, screws, joint compound and tape. It works completely offline and nothing you enter ever leaves your phone.

HOW IT WORKS
Tell the app your room's length, width and height. It calculates the wall area as the perimeter times the height, and can add the ceiling with a single switch. Subtract the area of doors and windows, set a wastage allowance, and pick your board size — the sheet count and material list update instantly.

1. Net area = wall area (and optional ceiling) minus the openings you subtract.
2. Area to cover = net area plus your wastage allowance (10–15% is typical).
3. Sheets = the area to cover divided by one board's area, always rounded up.
4. Finishing materials scale from the boarded area and sheet count.

WHAT YOU CAN DO
• Enter room dimensions and read the number of drywall sheets at once
• Toggle the ceiling on or off and set a wastage percentage you trust
• Subtract doors, windows and other openings in square feet
• Choose from common board sizes: 4×8, 4×9, 4×10, 4×12 ft and 1200×2400 mm
• See a full material take-off: sheets, screws, joint compound (lb) and tape (ft)
• Compare how many boards each sheet size would need, side by side
• Learn the formulas and rules of thumb behind every number

ESTIMATES USED
• Screws: about 32 per sheet on 16-inch framing
• Joint compound: about 0.05 lb per square foot for taping and finish coats
• Joint tape: about half a linear foot per square foot of board
These are sensible starting points; your real needs depend on the sheet layout, framing spacing and how openings fall.

BUILT FOR CLARITY
A clean Sheetrock-inspired design in cool grey and sky blue puts the big number first, with the supporting figures right beside it. Light and dark themes, a tiny download, no clutter and no account required.

AN ESTIMATE, NOT A QUOTE
This is an educational planning tool, not professional construction advice. Quantities are rounded up and include your wastage allowance, but every job is different. Always measure your own space and confirm quantities with your supplier before buying.

PRIVACY
The app collects no personal data and works fully offline. Ads are served by Google AdMob, which may use an advertising identifier as described in Google's policies.

Download Drywall Calculator and get a quick, sensible estimate of the boards and materials your next project needs.

Recent changes:
improve app performance