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Loan Calculator
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Drywall Calculator
Works out how many drywall sheets a room needs, plus screws, joint tape and compound, from the room size and the board size you are buying.
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Enter your figures and press Calculate.
In short
Drywall Calculator is a free online tool on inputtesthub.com that works out how many drywall sheets a room needs, plus screws, joint tape and compound, from the room size and the board size you are buying. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.
How to use the Drywall Calculator
- Enter the room dimensions and ceiling height.
- Choose the board size you can actually buy locally.
- Decide whether the ceiling is being boarded.
- Leave openings undeducted unless they are large enough to plan sheets around.
About the Drywall Calculator
The Drywall Calculator works out how many drywall sheets a room needs, plus screws, joint tape and compound, from the room size and the board size you are buying. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.
What people use it for
- Ordering board for a room without a second trip to the merchant.
- Checking a builder's material list before paying for it.
- Working out the screws, tape and compound that go with the board.
Details
| Openings | Not deducted by default — board is hung over them and cut out |
|---|---|
| Screws | About one per square foot of board at 16 in centres |
| Joint tape | Roughly 400 linear feet per 1,000 square feet of board |
| Compound | About 0.14 lb per square foot for a taped three-coat finish |
| Bucket | A 4.5 US gallon bucket holds around 61.7 lb of ready-mix |
The maths behind it
This tool uses net area = wall perimeter × height, plus the ceiling if boarded, plus a waste allowance; sheets = that area ÷ the area of one board, rounded up. Every intermediate value is shown on screen, so the result can be checked by hand.
The compound and tape figures assume a taped, three-coat, level-4 finish, which is what a room that gets painted normally gets. A level-5 skim over the whole surface — worth doing where raking light will cross a wall — roughly doubles the compound.
Where this tool stops
Assumes a rectangular room with flat walls and a flat ceiling. Vaulted ceilings, soffits, bulkheads and curved walls all use more board and much more compound than this will predict.
Frequently asked questions
Why does it not deduct doors and windows by default?
Because the trade does not. A sheet is hung straight over an opening and cut out afterwards, and the piece cut out is usually too small or too awkward to use elsewhere. Deducting the area is the commonest way a drywall estimate comes up short. Deduct only where an opening is big enough to lay sheets around — a patio door, a shopfront — not a window.
Should I use 8 ft or 12 ft boards?
Longer boards mean fewer butt joints, and butt joints are the ones that show, because there is no tapered edge to bed the tape into. If you can get 12 ft sheets into the room and have someone to help lift them, they finish better. In a stairwell or a tight hallway, 8 ft is the practical answer.
How much does the waste allowance matter?
More than for most materials, because drywall is bought in whole sheets and a 10% allowance on a small room often rounds to the same number of sheets. It matters on larger jobs, and on rooms with a lot of cuts — vaulted ceilings, alcoves, curved walls — where 15% is safer.
Is the Drywall Calculator free, or is there a paid tier?
Free, unlimited, and no email address required. You can use it a hundred times a day and nothing changes.
Is my data uploaded anywhere?
No. The Drywall Calculator runs entirely in your browser using JavaScript. Because the work happens locally, the page also keeps working if your connection drops, and closing the tab is all it takes to discard everything.
How is the result calculated?
It uses net area = wall perimeter × height, plus the ceiling if boarded, plus a waste allowance; sheets = that area ÷ the area of one board, rounded up. The full working is printed under the result, so you can follow every step rather than trusting a black box.
What do people use the Drywall Calculator for most?
The jobs it is built for: ordering board for a room without a second trip to the merchant. Checking a builder's material list before paying for it. Working out the screws, tape and compound that go with the board. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Where does the Drywall Calculator stop being reliable?
Assumes a rectangular room with flat walls and a flat ceiling. Vaulted ceilings, soffits, bulkheads and curved walls all use more board and much more compound than this will predict. Knowing where a tool stops being trustworthy matters more than the cases where it works.
What are the key numbers for the Drywall Calculator?
Openings is Not deducted by default — board is hung over them and cut out. Screws is About one per square foot of board at 16 in centres. Joint tape is Roughly 400 linear feet per 1,000 square feet of board. These are printed on the page itself, so you do not have to take them on trust.
How precise is the result?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.
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