Drywall Compound & Tape Calculator
Calculate joint compound and tape for finishing
Project Details
Typically 28-32 screws per sheet
10% recommended
Results
Enter details and click Calculate to see results
CACalifornia Building Code (Title 24)
References & Sources
⚠️ Compliance Limitations & Mitigations
- Limitation: Joint length is an average half-perimeter proxy (sheet width + height). Sheet count alone cannot determine board layout, room perimeter, openings, or boundary/butt-joint topology.
Mitigation: For a detailed take-off, measure the actual joints requiring tape and finishing and compare them with the proxy output.
Standards Cited
- ASTM C475 — Standard Specification for Joint Compound and Joint Tape for Finishing Gypsum Board
Defines joint compound types and performance requirements for drywall finishing - GA-214 — Gypsum Association — Recommended Levels of Gypsum Board Finish
Specifies finish levels (0-5) and corresponding compound application requirements
Formulas Used
- Joint length per sheet:
jointLength = sheetWidth + sheetHeight (accounting for shared edges)
Source: Average half-perimeter estimating proxy — Uses the selected regional sheet dimensions; library calls that omit a size default to 4x8 ft. - Compound volume:
compound = (jointLength × jointWidth) / coveragePerLitre × numberOfCoats
Source: Manufacturer coverage data — Joint feathering width ~125mm (5 inches) - Screw pop compound:
screwCompound = numberOfPops × 0.005 litres × numberOfCoats
Source: Industry practice
Key Assumptions
- Joint compound coverage ~1.5 m2 per litre per coat (USG all-purpose) — Manufacturer data (USG, National Gypsum)
- Standard tape roll: 250 ft (76.2 m) — USG / manufacturer standard
- Joint length uses the selected sheet size; 4 ft x 8 ft is the default when no size is supplied — ASTM C1396