Calculator
Lumber Calculator
Calculates the volume of one board, total lumber volume and board quantity by count or required coverage area.
Online calculation
Enter dimensions
Result
Result
Your result will appear here after calculation.
Calculation formula
Volume per board = length × width × thickness; coverage area = length × width. By area, board count = ceil(required area ÷ one-board coverage), then the allowance is added.
Example: A 4 × 0.15 × 0.025 m board has a volume of 0.015 m³ and covers 0.6 m². Twenty boards are 0.3 m³ and cover 12 m².
Frequently asked questions
Does this include gaps between boards?
No. Coverage uses the geometric board width. For a deck or floor with planned gaps or tongue-and-groove details, include a practical allowance.
Can it calculate load-bearing capacity?
No. That requires span, supports, timber grade and loads, which is a separate engineering calculation.