All toolsPaint & Drywall Calculator
Paint & Drywall Material Estimator
Enter room size, openings, and coat count — get gallons of paint and optional drywall sheet count. Try the room example (12' × 14' × 8').
Room dimensions
Feet
Inches
Feet
Inches
Feet
Inches
Room
12' × 14' × 8'
1 door, 2 windows deducted
Paint to buy
3.4 gallons
2 coats + 10% waste
Drywall sheets
19 sheets
4x8 + 10% waste
Wall area (net)
366 sq ft
Ceiling area
168 sq ft
Paintable area
534 sq ft
Drywall coverage
534 sq ft
Coverage varies by texture, color change, and primer needs. Drywall count assumes standard layout — complex rooms need more cuts.
Want a pro to handle it?
SMT Construction serves Cleveland & Northeast Ohio.