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Woodworking & Timber Verified Engineering Math Updated 2026 Standards

Board Foot Calculator — Lumber Volume & Cost

Calculate exact board feet (BF / FBM) and pricing for hardwood slabs, rough sawn timber, and standard dimensional lumber.

Buying rough sawn hardwoods at a sawmill or estimating framing lumber for a carpentry project? Lumber pricing in the US and international timber markets is quoted per board foot. Use our lumber volume calculator to calculate board footage, convert nominal sizes, and project material budgets.

Project Inputs & Specs

Real-Time Engine
Quick Standard Lumber Sizes
Thickness (in)
Width (in)
Length (ft)
Quantity (pcs)
$
per Board Foot (BF)

Visual Blueprint & Diagram

Dimensional Lumber Board Footage Reference Table (8-Foot Lengths)
Nominal SizeActual Size (S4S)BF per 8ft StudBF per 10ft Stud
1x40.75" × 3.5"2.66 BF3.33 BF
1x60.75" × 5.5"4.00 BF5.00 BF
1x80.75" × 7.25"5.34 BF6.67 BF
2x41.5" × 3.5"5.34 BF6.67 BF
2x61.5" × 5.5"8.00 BF10.00 BF
2x81.5" × 7.25"10.66 BF13.33 BF
Lumber Volume

Total Board Footage

80.00Board Feet (BF)

8.00 BF per board × 10 piece(s)

Single Board Volume
8.00BF / pc
2" × 6" × 8'
Total Cubic Feet
6.67cu ft
Physical cubic space
Total Piece Count
10boards
Lumber quantity
Estimated Cost
$360.00
@ $4.50 / BF
Purchasing Recommendation

Purchase 92.0 BF (includes 15% milling waste)

Sawmills and hardwood dealers expect buyers to add 15-20% waste allowance when planning table tops and cabinetry to mill around knots and sapwood.

Standard Board Foot & Lumber Formula

One board foot equals 144 cubic inches. Nominal thickness (inches) is multiplied by nominal width (inches) and length (feet), then divided by 12:

Board Feet (BF) = [Thickness(in) × Width(in) × Length(ft)] ÷ 12 | Total BF = Single BF × Quantity

Step-by-Step Step Rule:

  1. 1Enter nominal board thickness in inches (or rough quarter scale: 4/4 = 1", 8/4 = 2").
  2. 2Enter board width in inches.
  3. 3Enter total board length in feet.
  4. 4Specify total piece quantity and optional price per board foot to compute project material cost.

Frequently Asked Questions (FAQ)

A board foot (BF or Foot Board Measure, FBM) is a specialized unit of cubic volume used in the timber and hardwood lumber industries. One board foot represents a piece of rough lumber measuring 1 inch thick × 12 inches wide × 1 foot long (144 cubic inches of wood).
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