You ordered drywall by room square footage. You forgot the door. The last wall needed two more 4×8 sheets and a half-bag of mud while the hangers waited. That is the short-count tax every remodel charges when the takeoff was a napkin.
This is the drywall calculator you use on the job tomorrow, not theory. Not a full estimating suite. Punch length, width, height, openings, sheet size, and waste — then read sheets, tape, compound, and screws on your phone.
Free does one room. Pro is $9.99 a month for extra rooms, optional ceiling, waste as dollars, and a printable sheet list. Worth $9.99 if the week has more than one room or you need a list you can print from the truck. After the first sheet count, the next app in the suite was already open: Framing Takeoff Master for the studs behind the same walls.
What a drywall calculator app actually has to do
Most “best drywall calculator” pages stop at wall area ÷ 32. Ordering needs openings removed, a waste percent that survives a bad rip, sheet sizes that match your yard (4×8, 4×12, or 2400×1200 plasterboard / GIB), and the tape, compound, and screws that ride with the sheets. A review that matters has to survive dirty thumbs and a supply ticket you can read without translating a formula.
Sheet Takeoff Master is a phone-first PWA. Add it to the Home Screen. English UI. Feet/inches or metres/millimetres. Offline after the first load. No login. Data stays on the device. You enter room length, width, and height, subtract doors and windows, pick region sheet size and thickness, set waste, and optionally include the ceiling. You get sheets to buy, tape, compound bags, and screw counts you can act on.
The wall math is the same count we already published: wall area = 2 × (L + W) × H, subtract openings, divide by sheet area, then apply waste and round up. A 12×12 with 8 ft walls and one door is about 13 sheets of 4×8 after 10% waste. If you want the chart on paper, use How Many Drywall Sheets Do I Need? The app is that count plus tape, mud, screws, and the multi-room shapes Free does not cover.
The real test is the job the next morning. That is the only review that matters. If the number only works at a desk, it is homework. If it works in the truck before you load the trailer, it is a takeoff.
Free vs Pro — no mystery
| Feature | Free | Pro ($9.99/mo) |
|---|---|---|
| Rooms | One room | Extra rooms |
| Sheet count with openings subtracted | Yes | Yes |
| Tape, compound, screw estimates | Yes | Yes |
| Region sizes (4×8, 4×12, 2400×1200) | Yes | Yes |
| ft/in or m/mm toggle | Yes | Yes |
| JSON backup on this device | Yes | Yes |
| Optional ceiling takeoff | — | Yes |
| Waste as dollars (you type sheet price) | — | Yes |
| Printable sheet list / PNG | — | Yes |
Free is enough for one room and a clean sheet-and-mud list. Pro is for a second bedroom the same morning, a ceiling on the same takeoff, waste priced so the homeowner sees the buffer, or a printable list you can share from the phone. That is the $9.99 line.
There is no full FSM client portal here. Sheet Takeoff Master Pro is about more rooms and a sendable material list, not scheduling or invoices. If you need a branded fence PDF at contractor pricing, that is Fence Quote Pro on the hub — a different product.
The mistake everyone makes
Ordering by floor square footage. Walls are 2 × (L + W) × H, not L × W. The second mistake is skipping openings — or subtracting them twice in a spreadsheet someone else built. The third is buying net sheets with no waste; a bad rip or a wrong cut turns into another yard run while the hangers wait.
Sheet Takeoff Master wants length, width, height, and openings you set. Default waste starts around 10% for a straight rectangle room — raise it for odd corners, textured board, or picky face selection. You still own the thickness, fire rating, and finish level for your job. Measure the openings. Confirm the sheet size your yard stocks. A spare sheet beats a short last wall.
What it is not
Estimate only — not engineering or building-code advice. It will not stamp a drawing, check fire-rated assemblies, size soundboard stacks, or replace a licensed designer on a commercial hang. It is not a full bid system with labor rates, finish levels L3–L5, or client proposal PDFs.
No client portal, inventory sync, or invoice. One English UI. Price in USD. Markets: USA, UK, Australia, New Zealand, Canada. No AI. Math stays on-device.
Is $9.99 worth it?
If you hang one simple room a month and Free covers the sheet and mud list, Free is the product. Punch the size. Read the count. Buy the stock.
If the week stacks a second room, needs the ceiling on the same takeoff, or you want a printable list before you leave the yard, Pro is the product. One short drywall run and a second supply trip cost more than a month of Pro. Worth $9.99 on that week. Not worth pretending it replaces a stamped commercial takeoff. No fake star widget. No invented “customers say.” The test is whether the numbers hold on the job the next morning. Then Framing Takeoff Master is one tap away for the studs, and Concrete Mix Master is next for the footing under the new wall.
The series
Sheet Takeoff Master is one app in EBN Build Calculators. After the sheets, the next number is usually studs — or concrete for a footing. Same idea: phone-first, offline, estimate only. See the drywall sheet chart and the stud count guide when the same morning needs framing behind the board.
Bottom line
Sheet Takeoff Master is a drywall calculator you can use at the yard tomorrow. Not a textbook. Not a bid suite. Free for one room with sheets, tape, compound, and screws. Pro for extra rooms, ceiling, waste as dollars, and a printable list at $9.99 a month. Punch the size. Take the count to the yard. Open the next app in the series when the same walls need studs or footing concrete.
Open Sheet Takeoff MasterEstimate only — not engineering or building-code advice. Not a stamped drywall design. Not a contract.