Wood Siding Calculator
Calculate siding material needed for lap, shiplap, board & batten, and tongue & groove — with coverage factors.
Wood Siding Calculator
Calculate siding material needed with coverage factor and waste
Wall Dimensions
Siding Type
Deductions
Area Calculation
Material Needed
Formulas Used
Material Needed
Coverage factor accounts for overlap. Lap siding (6" exposure on 8" board) = 1.33× factor. Add waste for cuts and waste.
Net Wall Area
Deduct window and door openings from gross wall area.
Wood Siding Material Guide
Siding Coverage Factors
| Siding Type | Board Width | Exposure | Factor | |------------|------------|----------|--------| | Lap / Clapboard | 6-8" | 4-6" | 1.25-1.33 | | Shiplap | 6-8" | 5-6.5" | 1.23-1.38 | | Board & Batten | 8-12" boards | 8-12" | 1.30-1.45 | | Tongue & Groove | 6" | 5.25" | 1.40 | | Channel Siding | 6-8" | 5-6" | 1.33-1.38 |
Frequently Asked Questions
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