Deck Board Calculator — Cut List, Stock Lengths & Cost
Compare board directions and stock lengths for a rectangular deck. Count cut pieces, gaps, saw kerf, spare boards and quoted material cost.
Deck-board purchase estimate
29 boards26 cut-list boards + 3 extra boards · 16 ft stock.
192 sq ft · boards along the 16 ft side.
Edit your deck26 rows · 0 joints per row
Top view; check supports and product installation requirements separately.
Straight rows over one rectangular surface. Gaps, stock sizes and prices must match your product. Fascia, picture frames, stairs and framing are separate.
2. Available stock and quotes
Compare only products with the same actual width and gap requirement. Prices are per whole board, excluding tax and delivery. Leave prices blank if unknown.
Changing currency clears prices; no conversion is applied. Switching measurement units keeps your quotes.
Option 1
Option 2
Option 3
The table compares both board directions. Longer rows use equal-length segments, not an optimized or staggered installation plan. Every end joint needs appropriate support.
| Option | Boards run along | Stock length | Order boards | Joints per row | Material cost | Choose |
|---|---|---|---|---|---|---|
| 1 | 16 ft | 12 ft | 58 | 1 | Enter quote | |
| 1 | 12 ft | 12 ft | 39 | 0 | Enter quote | |
| 2 | 16 ft | 16 ft | 29 | 0 | Enter quote | |
| 2 | 12 ft | 16 ft | 39 | 0 | Enter quote | |
| 3 | 16 ft | 20 ft | 29 | 0 | Enter quote | |
| 3 | 12 ft | 20 ft | 39 | 0 | Enter quote |
No end joints in this quantity scenario. Verify board support, edge-strip width and product gapping before installation.
3. Cut list for the selected option
26 boards × 1 piece of 16 ft
Per stock board: 0 ft unused length, including trim and saw cuts.
3 extra boards are kept uncut.
Equal-length pieces may share a stock board only when they fit with the entered saw kerf. The cut list is one purchasing scenario, not a globally minimum purchase or a structural layout. Offcuts from ripped edge strips are not reused.
How many deck boards do I need?
First count rows using the actual board width and side gap: round up (deck width + gap) ÷ (board width + gap). The first and last strips are balanced to fill the measured width. Then check which row pieces can actually be cut from each available stock board.
For the default 16 × 12 ft deck, 5.5 in boards and 1/8 in side gaps require 26 rows. With 16 ft stock and no end trim, that is 26 base boards plus 3 extra at 10%: 29 boards. Both edge strips are 4.4375 in wide.
Why total linear feet can understate an order
26 rows of 9 ft need 234 linear feet. Dividing by 12 ft suggests 20 stock boards, but a 12 ft board yields only one continuous 9 ft row. A no-joint scenario therefore needs 26 boards before extras. Shorter pieces can share a board when their lengths and saw cuts fit.
Compare the real cut patterns and manufacturer requirements before choosing a cheaper option. Joists, joint blocking, allowable spans, fastening, edge support and required staggering are outside this quantity model.
Questions about deck-board quantities
Does the calculator include stairs and borders?
No. It covers a single rectangular field of straight rows. For a straight flight, use the stair stringer calculator to compare rise, going and the available run. Calculate fascia, picture frames and framing separately.
Are the suggested gaps suitable for every product?
No. The initial gaps are editable examples. Product, fastener, temperature and moisture conditions can change installation requirements.
Does a cut list prove the joints can be installed?
No. Equal segments may put joints in the same line. Confirm supporting members and required staggering before ordering or installing.
What does unused length include?
Stock length left after the required pieces, including reserved end trim and saw cuts. Extra uncut boards and material removed by ripping edge strips are separate.
Sources and related tools
TimberTech's decking quantity guide explains why stock length, orientation and product spacing matter. Trex's board quantity guide provides manufacturer planning context. Enter the requirements for your chosen product; these examples are not installation approval.
For adjacent landscape work, use the gravel calculator or concrete calculator.
Planning a panel fence beside your deck? Use the fence calculator to count panels, shared posts and gate openings separately.
Buying lumber quoted by volume? Use the board-foot calculator to tally stock boards and compare supplier price units.
