RightQty

Decks & carpentry

Board foot calculator

Convert a board count and lumber dimensions into board-foot volume, waste allowance, metric solid volume, and optional cost.

Lumber volume

Calculate board feet

Measurement system
Overage

Covers spillage, uneven depth, settling, and minor measurement differences.

Optional material costAdd your supplier's price

Only the named material is priced; other shopping-list items, tax, delivery, hardware, and labor are excluded.

No signup. Your measurements stay in your browser.

Your material estimate

Lumber volume with overage

117.4board feet

Includes 10% overage and purchase-unit rounding where applicable.

Base lumber volume
106.67 board feet
Board count
10 boards
Base solid volume
0.25 m³

Take this to your supplier

Shopping list

  • Lumber volumeIncludes 10% overage and rounds upward to 0.1 board foot.117.4 board feet
Calculation assumptions
  • Board-foot volume uses thickness in inches × width in inches × length in feet ÷ 12.
  • Enter the dimensions used by the seller for board-foot billing; nominal and surfaced dimensions may differ.
  • Board-foot volume does not determine how many stock boards or cuts a project requires.

Lumber volume

The board-foot formula

1

Normalize dimensions

Convert thickness and width to inches and length to feet.

2

Calculate volume

count × thickness × width × length ÷ 12.

3

Add allowance

Apply waste and round the purchase volume upward to 0.1 board foot.

Billing dimensions

Use the dimensions your seller uses

Rough, nominal, and surfaced lumber dimensions can differ. Board feet measure solid volume; they do not optimize a cut list or choose stock boards for a project.