Drywall mud calculator: how much drywall mud do I need?
5 gallons
500 square feet of drywall at 10 gal per 1,000 sq ft · 2 buckets of 3.5 gal · for 50 × 10 ft
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Enter it the way you measured it: 4.5, 4 1/2,
3/8 or 10' 6".
5 gallons
500 square feet of drywall at 10 gal per 1,000 sq ft · 2 buckets of 3.5 gal
Source: USG Sheetrock Brand All Purpose Joint Compound, Submittal Sheet J1969, coverage approximately 10 gal per 1,000 sq ft of gypsum panels, read October 11, 2026. Data sheet (PDF)
500 square feet of drywall takes about 5 gallons of all-purpose joint compound for taping and three coats, at 10 gallons per 1,000 square feet of panels. That is 2 buckets of the 3.5 gallon size.
A worked example
A 1,600 sq ft basement finished from 4.5 gallon buckets needs 16 gallons. 1,600 square feet of drywall at 10 gallons per 1,000 square feet is 16 gallons, which is 4 buckets of the 4.5 gallon size.
How much drywall mud do I need per sheet of drywall?
A 4 by 8 ft sheet of drywall is 32 square feet, so at the USG coverage of 10 gallons per 1,000 square feet it takes about 0.32 gallons of all-purpose joint compound to tape and finish, counting all three coats. A 3.5 gallon bucket finishes about 11 sheets, a 4.5 gallon bucket about 14, and a 1 gallon tub about 3. Enter the square feet of drywall above, or your sheet count times 32, and pick the bucket size to get the gallons and buckets for the whole job.
What else it is called
Drywall mud is also called joint compound, taping compound or just mud, and the premixed kind is sold as all-purpose, topping and lightweight compound. All-purpose, the type this coverage is for, does every stage: embedding tape, filling and the finish coats. It comes in boxes and buckets measured in gallons, which is why the answer is in gallons first.
Common sizes
| Drywall area | Compound | 3.5 gal buckets | 4.5 gal buckets |
|---|---|---|---|
| 200 sq ft | 2 gal | 1 | 1 |
| 400 sq ft | 4 gal | 2 | 1 |
| 500 sq ft | 5 gal | 2 | 2 |
| 800 sq ft | 8 gal | 3 | 2 |
| 1,000 sq ft | 10 gal | 3 | 3 |
| 1,600 sq ft | 16 gal | 5 | 4 |
Gallons of all-purpose joint compound at 10 gal per 1,000 sq ft of gypsum panels (USG Submittal Sheet J1969), for taping and three coats. Buckets rounded up.
Where the numbers come from
- Gallons of compound is the drywall area divided by 1,000, times the coverage. Buckets is the gallons divided by the size you buy, rounded up.
- Coverage: USG Sheetrock Brand All Purpose Joint Compound, Submittal Sheet J1969, approximately 10 gallons per 1,000 square feet of gypsum panels, for all phases of finishing, taping and three coats. Read October 11, 2026. Data sheet (PDF)
This is the total square feet of drywall you are finishing, the boards on the walls and the ceiling added together, not the floor area of the room. The 10 gallons per 1,000 square feet covers taping and the three finishing coats; a full skim coat over the whole surface uses more. It does not subtract outlets or small openings.
By Javier Miralles · Last updated . How this site is made.
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