Trades & Contractor Calculators

Practical calculation tools for electricians, drywallers, flooring installers, masons, plumbers, and movers. Sizing for wire gauge, tile, drywall sheets, concrete, HVAC BTUs, moving supplies, and pipe velocity.

Drywall Sheets & Materials

Calculate 4x8 and 4x12 drywall sheets, joint compound pails, tape, and screws.

Room Specifications

Length (ft)

Width (ft)

Height (ft)

Include Ceiling Drywall

Waste / Cut Contingency (%)

Doors (deduct 20 sq ft)

Windows (deduct 15 sq ft)

Preferred Sheet Size

Drywall Material Estimates

Drywall Sheets Required (4' × 8')

20 Sheets

Covers 627 sq ft total (incl. 10% waste)

4' × 8' Sheets Alternative

20 Sheets

32 sq ft per sheet

4' × 12' Sheets Alternative

14 Sheets

48 sq ft per sheet

Finishing Supply	Recommended Qty
Net Wall Area	378 sq ft
Ceiling Area	192 sq ft
Drywall Screws (1-1/4")	~640 (2.3 lbs)
Joint Compound (Mud)	2 × 4.5 Gal Pail (~7 gal)
Paper / Mesh Joint Tape	3 Roll (700 linear ft)