Decking, Fencing & Timber calculator
Timber / Lumber Calculator
Calculate timber volume or board feet from stock thickness, width, length and quantity.
Calculate timber volume or board feet from stock thickness, width, length and quantity. The tool is designed for transparent planning: you can see the measurements, product assumptions and allowance that drive the result. Review nominal versus actual dimensions before ordering or setting out. Board-foot calculations use dimensions as entered. If timber is sold using nominal sizes, confirm whether pricing is based on nominal or surfaced dimensions.
What you need to enter
The Timber / Lumber Calculator uses the following project information to calculate the result.
- Thickness
- Width
- Length
- Quantity
Calculator result
Timber volume / board feet
How the Timber / Lumber Calculator works
This page is built around converts dimensional lumber volume to requested units. Applied to timber volume or board-foot quantity from stock dimensions, the engine first converts compatible measurements to a common basis and then calculates timber volume / board feet. Verify nominal versus actual dimensions before treating the output as a buying, sizing or set-out figure.
Timber / Lumber Calculator worked example
Timber / Lumber Calculator example: twelve boards measuring 38 mm × 140 mm × 3.6 m have about 0.230 m³ of total timber volume. The same dimensions can be converted to board feet when comparing imperial timber pricing. This example shows the arithmetic only; on a live job, review nominal versus actual dimensions before turning the result into an order or final size.
Important calculation assumptions
For timber volume or board-foot quantity from stock dimensions, board-foot calculations use dimensions as entered. If timber is sold using nominal sizes, confirm whether pricing is based on nominal or surfaced dimensions.
Frequently asked questions
Which starting measurements make the Timber / Lumber Calculator more reliable?
Start with the real project rather than nominal dimensions. Enter timber thickness, width, length and quantity, making clear whether the dimensions are nominal or actual. That gives the Timber / Lumber Calculator the inputs it needs for timber volume or board-foot quantity from stock dimensions.
What should I know about nominal versus actual dimensions before using the Timber / Lumber Calculator?
The key uncertainty in the Timber / Lumber Calculator concerns nominal versus actual dimensions. Board-foot calculations use dimensions as entered. If timber is sold using nominal sizes, confirm whether pricing is based on nominal or surfaced dimensions.
What precision should I keep from the Timber / Lumber Calculator?
For the Timber / Lumber Calculator, use the result for timber volume or pricing comparisons, but confirm whether the supplier quotes nominal or actual dimensions and whether waste should be added separately. This keeps the estimate connected to the actual product, site or design.