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Hardwood board footage calculator

Board footage means one thing at the lumber yard and another on a job sheet. Both calculators are here: one turns a room into linear feet, pieces and bundles of flooring, the other returns board feet of rough stock.

For a floor: linear feet = square footage × (1 + waste) × 12 ÷ face width in inches. A 200 sq ft room at 10% waste in 2-1/4" strip is 1,174 linear feet of board. For lumber: board feet = thickness × width × length ÷ 144, all three in inches, because one board foot is 144 cubic inches.

1 · Flooring coverage — boards for a room

Face width is the width the board shows once it is down, with the tongue left out. Board length applies to fixed-length planks; leave it empty for random-length bundles. The 20 sq ft bundle is a round number to show the arithmetic — use the coverage printed on the bundle you are buying. Waste commonly runs 10% straight or plank, 15% diagonal, 20% herringbone.

Boards needed

1,174 linear feet

  • Measured floor area200 sq ft
  • With 10% waste220 sq ft
  • Covered per linear foot at 2.25 in0.19 sq ft
  • Pieces at 48 in long294 pieces
  • Bundles at 20 sq ft11 bundles

Linear feet, pieces and bundles all round up. Nothing here is saved or sent anywhere.

This is one room. SquareTally counts boards for every room on a plan set at once — see the takeoff.

2 · Board feet — rough stock and custom milling

All three dimensions in inches. Quarter measure translates straight across: 4/4 is 1, 5/4 is 1.25, 6/4 is 1.5, 8/4 is 2. Rough hardwood is billed on the thickness it was sawn at, so enter 1 for 4/4 even when the surfaced board measures 3/4.

Board feet in the order

40 board feet

  • Volume of one piece576 cu in
  • Board feet in one piece4 bd ft
  • Pieces10
  • The same pieces at 3/4 in surfaced30 bd ft

One board foot is 144 cubic inches. Nothing here is saved or sent anywhere.

Buying rough and milling your own flooring? Price the finished square footage in the takeoff and keep the stock order beside it.

Two things are called board footage

A board foot is a unit of volume: 144 cubic inches, the wood in a piece one inch thick, twelve inches wide and twelve inches long. It is how sawmills sell rough lumber, where the thickness is worth paying for and the width is irregular.

Board footage on a flooring job is coverage: how much board it takes to floor a room. Flooring is sold, priced and quoted by the square foot, so linear feet, pieces and bundles are working numbers on the way to an order.

A buyer typing hardwood board footage almost always wants the second one. The first matters when the wood arrives rough: reclaimed stock through a moulder, a custom width the mill has to run, stair treads and nosings.

The formulas, written out

Coverage rests on one square foot being 144 square inches. A board of face width W inches covers W ÷ 12 square feet for every linear foot of its length, so:

  1. Area with waste = area × (1 + waste ÷ 100)
  2. Linear feet = area with waste × 12 ÷ face width in inches
  3. Pieces = linear feet ÷ length of one board in feet, rounded up
  4. Bundles = area with waste ÷ coverage per bundle, rounded up

Volume rests on a board foot being 144 cubic inches. With every dimension in inches:

  1. Board feet = thickness × width × length ÷ 144
  2. The same sum with length in feet divides by 12 instead

The two 144s are a coincidence: square inches in a square foot, cubic inches in a board foot.

Waste belongs to the pattern. Ten percent is the common starting point for a straight or plank floor, around 15% for a diagonal, and 20% for herringbone or chevron, where every run ends in a handed angled cut. A job carrying two patterns wants each area taken at its own rate and the results added.

Nominal and actual are different numbers

The same fraction means opposite things on either side of this page. In flooring, 3/4" is real: a 3/4" solid strip measures three quarters of an inch at the face, which is why it can be sanded several times over its life. The trap here sits on the width, because the tongue on the edge adds to the piece you hold and adds nothing to the floor you see. Take the face width off the specification for any coverage sum.

In the lumber yard the same 3/4" arrives from the other direction. Rough hardwood is sold in quarters of an inch — 4/4, 5/4, 6/4, 8/4 — and 4/4 stock is one inch off the saw, landing near 3/4" once surfaced. The invoice still says 4/4 and the board feet are still charged on the inch, because you paid for the wood the planer turned into shavings.

A worked floor

A 200 sq ft bedroom in 3/4" × 2-1/4" solid strip oak, laid straight, ordered at 10% waste.

  1. With waste: 200 × 1.10 = 220 sq ft
  2. Coverage per linear foot: 2.25 ÷ 12 = 0.1875 sq ft
  3. Linear feet: 220 × 12 ÷ 2.25 = 1,174 lin ft
  4. At 20 sq ft to the bundle: 220 ÷ 20 = 11 bundles

Widen the board and the linear feet fall away fast: the same 220 sq ft in a 5" plank is 528 linear feet.

A worked lumber order

Ten pieces of 4/4 white oak, 6" wide and 8 feet long, bought rough for a stair.

  1. One piece: 1 × 6 × 96 = 576 cu in
  2. In board feet: 576 ÷ 144 = 4 bd ft
  3. Ten pieces: 40 bd ft on the invoice
  4. Wood left after surfacing to 3/4": 30 bd ft

Those last two lines are why a milling job costs more than it looks: you pay for 40 board feet and 30 arrive in the finished pieces. Ripping to a flooring width takes another slice in saw kerf, so a mill order wants its own allowance on top of the laying waste.

This is one room. A job is a plan set.

The calculators above take one area against one board. SquareTally runs the same arithmetic across a whole plan set: calibrate the architect's PDF against a dimension printed on it, trace every room, and give each one a product and a laying style. The waste rate lives on the laying style, so a herringbone entry and a straight-plank bedroom carry their own rates inside one job. Quantities group by product and pattern, priced from your own vendor sheets, and come out as a branded PDF quote or linked drafts in your own QuickBooks Online.

Board footage, asked and answered

What does board footage mean for hardwood flooring?
For a floor it means the amount of board a room needs, as linear feet, pieces or bundles. Flooring is sold by the square foot, so square footage is what gets quoted and linear feet are what the boards on the truck add up to. Board feet, the volume unit, belongs to rough lumber and custom milling.
How do I calculate board feet?
Board feet equals thickness multiplied by width multiplied by length, all in inches, divided by 144. One board foot is 144 cubic inches: a piece one inch thick, twelve inches wide and twelve inches long. A piece 1 by 6 by 96 inches holds 576 cubic inches, so it is 4 board feet.
How many linear feet of 2-1/4 inch boards cover 200 square feet?
Coverage at 2-1/4 inches of face width is 2-1/4 divided by 12, or 0.1875 square feet for every linear foot. A bare 200 square feet takes 1,067 linear feet. Add a 10% waste factor and the area becomes 220 square feet, which takes 1,174 linear feet of board.
Is a 3/4 inch board actually 3/4 of an inch thick?
In flooring, yes: 3/4 inch solid strip measures 3/4 of an inch at the face. In the lumber yard the same number arrives from the other direction, because 4/4 stock is one inch in the rough and lands near 3/4 of an inch once surfaced, while the invoice still says 4/4.
How much waste should I add to a hardwood order?
The waste factor follows the laying pattern rather than the room: a straight or plank floor is commonly ordered at 10%, a diagonal at around 15%, and herringbone or chevron at 20%, because every angled run ends in a handed cut that cannot start the next one. Small and cut-up rooms deserve the higher end of whichever band applies.

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