RightQty

Decks & carpentry

Deck board calculator

Estimate surface board rows and stock-length pieces using deck dimensions, actual board face width, installed gap, and cut waste.

Deck surface

Estimate deck board quantities

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.

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Your material estimate

Deck boards to order

25boards

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

Deck surface area
120 sq ft
Board rows
22 rows
Purchased board length
300 linear ft

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Shopping list

  • Deck boards22 rows × 1 piece(s) per row, plus 10% overage.25 stock-length boards
Calculation assumptions
  • Boards run along the entered deck length and rows cover the entered deck width.
  • The face-width calculation includes one gap between adjacent rows and no gap beyond the two outside edges.
  • Every row uses the same number of full stock-length pieces; cut-off reuse and stagger optimization are not assumed.
  • Picture frames, breaker boards, stairs, fascia, fasteners, and manufacturer-specific expansion rules are excluded.

Surface layout

How deck boards are counted

1

Board rows

Cover deck width using actual face width plus the installed gap.

2

Pieces per row

Divide deck length by selected stock length and round upward.

3

Order count

Multiply rows by pieces per row, add waste, and round to whole boards.

Layout boundary

Verify the board pattern and expansion rules

Picture frames, breaker boards, stairs, fascia, diagonal patterns, butt-joint staggering, cut-off reuse, and manufacturer-specific gaps require a project layout beyond this regular field estimate.