Check actual dimensions before treating board feet as physical timber volume.
Are the listed board dimensions actual measurements or nominal labels?
Use the matching calculator
Use this decision sequence
- Keep the supplier’s nominal product label as an identifier.
- Use the applicable actual measured dimensions for physical volume.
- Apply board-foot conversion only after the dimensional basis is established.
- Compare quotations using the supplier’s stated sales basis rather than assuming one universal convention.
Keep the quantities distinct
| Quantity or assumption | How to use it |
|---|---|
| Nominal label | Not automatically an actual measurement. |
| Physical volume | Uses actual length, width and thickness. |
| Supplier billing basis | May be described differently and must be read from the quote. |
Worked comparison
An illustrative actual board measuring 2 m by 0.1 m by 0.02 m has volume 0.004 m³. Changing the entered width to 0.12 m raises the estimate to 0.0048 m³, a 20% difference before any conversion to board feet. A perfectly correct unit conversion cannot fix an incorrect dimension basis; start from the applicable supplied measurements.
Check before using the estimate
No lumber grade, span, load or structural section is selected by a quantity conversion.
All dimensions, product properties, prices and specifications in this example are illustrative arithmetic inputs. Use the values from your measured plan, selected product data sheet and supplier quote. This guide does not choose construction specifications or certify safety.
Calculation and scope checked 2026-10-04. Methods and scope.