Calculator
Lumber/Timber Cost Calculator
Estimate lumber/timber material cost from quantity, unit price, waste, and optional extra allowance. Use it when comparing supplier prices, budgeting a project, or checking whether a material order fits your plan.
Lumber/timber cost calculator
Result
Enter a quantity and unit price, then calculate the estimated total.
These results are estimates only. Verify measurements, material specifications, structural requirements, safety requirements, and local building rules before buying materials or building.
How this calculator works
This calculator estimates material cost from a quantity and price per unit. It works with board foot, linear length, area, or piece-count pricing because the maths is the same once the quantity and unit price are known.
Waste percentage covers extra lumber/timber, sheet goods, or pieces needed for trimming, defects, milling, and mistakes. The optional extra percentage can represent any additional allowance you want to include, but it is not labelled as tax or tied to any country.
Formula
- Base cost = quantity x price per unit.
- Waste multiplier = 1 + waste_percent / 100.
- Extra multiplier = 1 + extra_percent / 100.
- Estimated total = base cost x waste multiplier x extra multiplier.
Worked example
If you need 80 board feet at $6 per board foot with 10% waste and 5% optional extra: base cost is $480.
The estimate is $480 x 1.10 x 1.05 = $554.40.
Common mistakes
- Mixing unit types, such as entering linear feet when the price is per board foot.
- Leaving out waste for trimming, defects, and layout choices.
- Treating the optional extra percentage as a country-specific tax.
- Comparing quotes without checking whether each supplier prices by board foot, length, area, piece, or sheet.
FAQs
Does this calculator convert currencies?
No. It preserves the symbol you enter and performs no exchange-rate conversion.
What should I use for waste percentage?
Use a project-specific allowance for offcuts, defects, milling, matching, and mistakes.
Can I use this for sheet goods?
Yes, if you already know the number of sheets or area and the matching price per unit.
What is the optional extra percentage for?
It is a generic extra allowance for any additional percentage you choose to include.
Calculator disclaimer
These results are estimates only. Verify measurements, material specifications, structural requirements, safety requirements, and local building rules before buying materials or building.