Soffit & Fascia Calculator
Calculate soffit panels, fascia boards, and J-channel needed for your home.
Enter perimeter and overhang width.
Soffit & Fascia Materials
Soffit & fascia material calculations:
Soffit Area = House Perimeter × Overhang Width
Soffit Panels = Soffit Area / Panel Coverage (standard panel covers ~12 sq ft or ~1.1 sq m)
Fascia Boards = Perimeter / Board Length (standard 12 ft or 3.6 m boards)
J-Channel = (Perimeter × 2) / Strip Length (runs along both wall and fascia edges)
Standard sizing:
- Soffit panels: 12 in × 12 ft (30 cm × 3.6 m)
- Fascia boards: 1 × 6 or 1 × 8, in 12 ft (3.6 m) lengths
- J-channel: 12.5 ft (3.8 m) strips
Add 10% extra for waste, corners, and cuts.