Lumber Purchase List calculator.
Keep different board sizes separate while estimating purchase counts and volume.
Your inputs
Use measurements from your plan and properties from your chosen product. Any prefilled values are illustrative.
A clear estimate starts here.
Enter your dimensions and product details to see the quantity and purchase breakdown.
Formula and assumptions
How this calculation works.
Each stock item gets its own whole-board allowance. The volume is summed after rounding each item. Different sizes stay visible as separate lines.
A worked example
Illustrative inputs only. Product properties and design dimensions are not recommendations for your project.
- Waste allowance
- 10 %
- Purchased board length
- 2 m
- Actual width
- 100 mm
- Actual thickness
- 20 mm
- Boards needed
- 10
- Purchased board length
- 3 m
- Actual width
- 200 mm
- Actual thickness
- 40 mm
- Boards needed
- 5
Purchased lumber volume: 0.19 m³
Before you purchase
Use dimensions from your plan and properties from your chosen product. Any design spacing, section or fixing pattern must already be specified.
No cut optimisation, timber grade selection or load assessment is performed.
Method: dimensional arithmetic and user-supplied specifications. Software checks: 2026-10-04. Calculation and review policy.