Construction & Materials
Lumber Calculator
Lumber Calculator is a browser-based calculator tool on CalcToolsBase. Free, browser-based Lumber Calculator. Enter your values for an instant, clearly-labelled result - no signup, no uploads. To use it, enter your values and view the result directly in your browser — no signup and nothing to install.
Enter your number of pieces, thickness, width and length and Lumber Calculator works out the total board feet for the order with each piece's thickness, width and length — fast, free and private, with no sign-up or uploads.
Estimate only — not engineering or contractor advice. Quantities depend on the dimensions and board sizes you enter, plus the gap, joist spacing and waste %; allow for usable lengths and offcuts.
About this calculator
The Lumber Calculator is a lightweight, browser-based calculator for when you need to total up board feet. It takes your number of pieces, thickness, width and length, applies each piece's thickness, width and length, and reports the total board feet for the order clearly. Nothing is uploaded and nothing is saved between visits.
How to use
- Enter the number of pieces.
- Enter the board thickness in inches.
- Enter the board width in inches and the length in feet.
- Tap Calculate to see the total board feet.
Why use the Lumber Calculator
Instant
Every quantity is worked out on your device the moment you tap Calculate.
Private
The numbers you enter stay in your browser and are never uploaded or saved.
Free
No signup, no paywall, and no ads placed inside your results.
Works offline
Once the page has loaded it keeps working on a weak or dropped connection.
Mobile-first
Laid out for phones and tablets on site just as much as for desktops.
Planning estimates
Results are simplified planning estimates; real material needs vary by product size, waste, layout, local codes, and site conditions, so confirm before you buy or build.
Common uses
Lumber when pricing timber by board foot
Lumber for a framing or joinery order
Lumber when allowing for usable lengths and offcuts
Lumber when budgeting a timber purchase
Lumber when totalling board feet
Lumber for contractor and client quotes
Technical notes
Lumber Calculator totals board feet from each piece’s thickness, width and length and sums the order.
Totals board feet from the pieces you enter; round up for usable lengths and offcuts.
Nothing you type is uploaded — the calculation happens entirely on your device.
Worked example
24 studs at 2.4 m each = 57.6 linear metres of timber; board-foot or length pricing then gives the cost.
FAQ
How are board feet worked out?
Pieces times thickness times width in inches times length in feet, divided by 12, gives board feet.
Does the Lumber Calculator keep my entries private?
Yes. The Lumber Calculator runs in your browser, so nothing you enter is uploaded or saved.
Why divide by 12 and not 144?
When the length is already in feet, the board-foot formula divides by 12 rather than 144.
Should I use nominal or actual sizes?
Board feet use nominal sizes; dressed lumber is slightly smaller, so allow for that when fitting.