Calculate board feet, waste-adjusted lumber order quantity, optional price per board foot, cubic volume.
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Board-foot takeoff Estimate board feet from actual lumber dimensions, add a waste allowance, and price the order by board foot before you compare cubic feet or cubic metres.
Measurement basis
Quick lumber examples
Use actual measured dimensions Board-foot pricing is based on stock volume. Enter the actual rough or surfaced thickness, width, and length used by your supplier, not only a nominal size label.
Result
35.20 bf
Order target after 10% waste. The measured stock contains 32.00 bf before trim loss.
Board feet per piece
8.00 bf
Waste allowance
3.20 bf
Total cubic feet
2.67 ft³
Total cubic metres
0.08 m³
Input stock volume
0.67 ft³
Estimated material cost
Add a price
How to use this result
Compare supplier quotes using the waste-adjusted board-foot order target. Keep the measured board-foot total for quote checks, and use
cubic-volume figures when you also need a storage, freight, or workshop handling estimate.
Board feet, cubic volume, and lumber order planning
A board foot calculator converts timber dimensions into board feet so you can price lumber, compare supplier quotes, and plan stock quantities more confidently. It also shows cubic volume and per-piece volume so you can cross-check the result when ordering rough sawn boards, hardwood stock, or mixed timber packages.
What a board foot calculator measures
A board foot is a volume unit used in the timber trade, especially for rough sawn lumber and hardwood stock. One board foot equals a board that is 1 inch thick, 12 inches wide, and 1 foot long. That makes a board foot calculator useful whenever you know the dimensions of the stock but need a standard buying unit for pricing or quantity planning.
This matters because timber yards often quote by board foot while builders and woodworkers may think in individual boards, cubic feet, or cubic metres. Converting everything into board feet helps you compare different board sizes on the same basis before you place an order.
Core board foot formula
The formula is straightforward once thickness and width are expressed in inches and length is expressed in feet. If you start in metric, the calculator converts the measurements first and then applies the same standard timber formula.
Board feet = (Thickness in inches x Width in inches x Length in feet) / 12
This is the standard board-foot formula used for dimensional lumber, hardwood boards, and rough-sawn stock sold by volume.
Total board feet = Board feet per piece x Quantity
Once the per-piece volume is known, multiplying by quantity gives the order total for quote comparison or timber-yard pricing.
How to use the result when ordering timber
The most useful workflow is to calculate the board feet per piece first, then check the total board feet for the whole order. That lets you compare different thicknesses or board lengths without converting each quote manually. If you are shipping the order or checking storage space, the cubic-foot and cubic-metre outputs give a second practical view of the same stock volume.
For example, ten boards at 2 x 6 x 8 feet contain 80 board feet in total. If the supplier quotes a price per board foot, multiply that rate by 80 to estimate the material cost before waste, trimming, or grade selection are added.
Waste allowance and price per board foot
A practical board feet calculator should not stop at the bare measured volume. Woodworkers often need an order target that allows for end checks, trimming, sapwood, knots, grain matching, joinery mistakes, and layout decisions. Adding a waste percentage turns the measured board footage into a purchase quantity that is closer to how real lumber orders are built.
If you have a supplier quote, enter the price per board foot to estimate the material cost from the waste-adjusted order target. This makes the page useful as both a lumber volume calculator and a board foot cost calculator, while still keeping the raw measured board footage visible for quote checking.
Actual dimensions, nominal sizes, and hardwood thickness
Board-foot math works from actual volume. A nominal 2 x 6 may not measure exactly 2 inches by 6 inches after drying and surfacing, and hardwood stock sold as 4/4, 5/4, or 8/4 may be rough, surfaced, or skip-planed depending on the supplier. If the price is based on rough stock volume, use the dimensions the supplier uses for billing; if you are checking a finished piece, use the actual measured size.
The quick examples are designed to surface those common contexts: a dimensional-lumber order, a 4/4 hardwood board purchase, and a metric timber pack. They are starting points only, but they help prevent the most common mistake: mixing nominal labels, finished measurements, and supplier board-foot pricing conventions in one estimate.
Worked example: four boards at 2 x 6 x 8 feet
A board that measures 2 inches thick, 6 inches wide, and 8 feet long contains (2 x 6 x 8) / 12 = 8 board feet. Four identical boards therefore contain 32 board feet in total.
That same order is about 2.67 cubic feet or roughly 0.08 cubic metres of stock. If you add a 10% trim allowance, the purchase target becomes 35.2 board feet. Seeing all three numbers together makes it easier to compare timber-yard pricing against storage, handling, or shipping estimates.
What this estimate does not cover
A board foot calculator measures theoretical stock volume only. It does not adjust for planed size versus nominal size, grading, defects, moisture content, machining loss, or the waste created when you cut around knots and checks. Hardwood yards and softwood merchants may also use slightly different selling conventions depending on whether stock is rough, planed, or sold as finished dimensional lumber.
Use the result as a pricing and quantity-planning tool, then confirm how the specific supplier measures and bills its stock before ordering a large quantity of timber.
Frequently asked questions
What is one board foot of lumber?
One board foot is the volume of a board that is 1 inch thick, 12 inches wide, and 1 foot long. It is a timber-trade volume unit used to price rough sawn boards and hardwood stock.
Can I use a board foot calculator with metric measurements?
Yes. The calculator can accept metric inputs, convert them into the standard board-foot basis, and then return the result in board feet together with cubic-metre and cubic-foot cross-checks.
Why does nominal timber size differ from actual size?
Because dressed or planed lumber is often sold under nominal dimensions such as 2 x 4, while the actual finished size is smaller after drying and machining. Use actual measured size when you want the most accurate board-foot estimate.
Is board footage the same as cubic feet?
No. Board feet and cubic feet are both volume measures, but one cubic foot contains 12 board feet. The calculator shows both so you can compare timber-trade pricing with physical storage or shipping volume.
How do I calculate board feet with waste?
First calculate the measured board feet, then multiply by one plus the waste percentage. For example, 32 measured board feet with a 10% allowance becomes 35.2 board feet to order. The calculator keeps both numbers visible so you can see the raw volume and the practical purchase target.
Can this work as a board foot cost calculator?
Yes. Enter the supplier's price per board foot and the calculator multiplies that rate by the waste-adjusted board-foot order target. It estimates material cost only, not milling, delivery, tax, surfacing fees, minimum order charges, or grade premiums.
Should I enter nominal lumber size or actual measured size?
Use the size basis that matches the supplier's pricing. If a yard bills rough hardwood by rough dimensions, use those billing dimensions. If you are checking finished surfaced boards or a project cut list, use the actual measured thickness, width, and length rather than relying on a nominal size label.
What does 4/4 hardwood mean in board-foot calculations?
Four-quarter, or 4/4, hardwood is commonly treated as roughly 1 inch thick before surfacing. Board-foot calculations still depend on the billing thickness, board width, board length, and quantity, so confirm whether your supplier prices rough, surfaced, or skip-planed stock.
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