Rex says
Everyday utility math — the kind you'd otherwise pull up four browser tabs for. I keep it to one clean answer.
Try a scenario
Click to load — tweak from there.Inputs
Result
Drywall sheets
21
Sheet cost
$336
Total area with waste (sq ft)
654
Joint compound (gallons)
6.5
Joint tape (linear ft)
458
Screws
756
Psst — share this and help Rex grow
One click, a permanent link with your numbers baked in.
How to use this
- 1Enter room length (ft).
- 2Enter room width (ft).
- 3Enter ceiling height (ft).
- 4Enter sheet size (sq ft).
- 5Enter include ceiling?.
- 6Enter waste factor (%).
- 7Enter price per sheet ($).
- 8Read your drywall sheets on the right — it updates as you type.
- 9Hit Share to keep the scenario or send it to someone.
About this calculator
Sheet count is wall and ceiling area divided by sheet size, plus waste for cutouts. Budget roughly one gallon of compound per 100 sq ft for three coats.
Worked example
Using the values the calculator loads with:
Inputs
- Room length: 14 ft
- Room width: 12 ft
- Ceiling height: 8 ft
- Sheet size: 32 sq ft
- Include ceiling?: Yes
- Waste factor: 12 %
- Price per sheet: 16 $
Results
- Drywall sheets: 21
- Sheet cost: $336
- Total area with waste (sq ft): 654
- Joint compound (gallons): 6.5
- Joint tape (linear ft): 458
- Screws: 756
What each field means
Inputs
- Room length (ft)
- The room length used in the calculation, measured in ft. Starts at 14 ft so you have a working example on load.
- Room width (ft)
- The room width used in the calculation, measured in ft. Starts at 12 ft so you have a working example on load.
- Ceiling height (ft)
- The ceiling height used in the calculation, measured in ft. Starts at 8 ft so you have a working example on load.
- Sheet size (sq ft)
- The sheet size used in the calculation, measured in sq ft. Starts at 32 sq ft so you have a working example on load. Accepted range: 24–64 sq ft.
- Include ceiling?
- Pick the option that matches your situation — the maths changes per option. Choices: Yes, No.
- Waste factor (%)
- The waste factor used in the calculation, measured in %. Starts at 12 % so you have a working example on load. Accepted range: 0–30 %.
- Price per sheet ($)
- The price per sheet used in the calculation, measured in $. Starts at 16 $ so you have a working example on load.
Results
- Drywall sheets
- Returned as a whole number and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Sheet cost
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Total area with waste (sq ft)
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Joint compound (gallons)
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Joint tape (linear ft)
- Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Screws
- Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
How does the drywall sheet, mud & screw calculator work?
Sheet count is wall and ceiling area divided by sheet size, plus waste for cutouts. Budget roughly one gallon of compound per 100 sq ft for three coats. The underlying maths is: Sheets = (wall + ceiling area) × (1 + waste) ÷ sheet area.
What do I need to enter?
7 values: room length, room width, ceiling height, sheet size, include ceiling?, waste factor, and price per sheet. Each field starts with a sensible default, so you can change one number at a time and watch the result move.
What does the drywall sheets result mean?
It is returned as a whole number and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds.
Is this calculator free, and do I need an account?
Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser.
How accurate is the result?
It applies the standard formula exactly, so the arithmetic is precise. Estimates assume standard, average conditions — local rules, pricing, and materials vary.
Who is this tool for?
It's built for anyone doing everyday planning maths — a quick estimate that would otherwise need four browser tabs and a calculator app.
Accuracy and limitations
- Estimates assume standard, average conditions — local rules, pricing, and materials vary.
- Results are rounded for readability; add a buffer before ordering, booking, or committing.
- Double-check anything with a real cost attached against a local quote.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Drywall Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/drywall-calculator
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/drywall-calculator" target="_blank" rel="noopener">Drywall Calculator — RevenueLab</a> (2026).</p>
Source: [Drywall Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/drywall-calculator) (2026).