Easy Wood Calc

How many 16 in pieces from an 8 ft 2×4?

Short answer

An 8 ft 2×4 yields 5 pieces 16 inches long with a ⅛ inch kerf, not six — six would need 96⅝ inches. Six 16 in blocks take 2 boards.

How to work it out

  1. How many 16 in pieces fit on one board: (96 in usable + 1/8 in kerf) ÷ (16 in + kerf) = 5.96 → 5 pieces
  2. 6 × 16 in = 8 ft of parts, packed to fill each board as full as it will go → 2 boards (50% offcut and kerf)

Sixteen inches is the standard stud spacing, so 16 in blocks and 14½ in blocking come up constantly in framing. For blocking between studs 16 in on center, the actual block is 14½ in — enter 14 1/2 above and the yield rises to six per board.

Adjust for your project

Buying rough hardwood by the board foot? Switch to the rough-stock takeoff.
Pieces
1 row
One row per length; fractions work (28 1/2). Shelves that sit between the sides: outside width − 2 × side thickness — 30 − 2 × 3/4 = 28 1/2.
in
Works out the length of shelves that fit between the sides. Copy it into the pieces above.
in
Type 8' or 96 — 8 ft = 96 in · 10 ft = 120 · 12 ft = 144.
Only labels the shopping list — the cutting math is the same for any width.
More options: Kerf · Trim · Price per board (optional)
in
The sliver of wood each cut turns to sawdust. Most saws: 1/8 in.
in
Cut off once per board if the factory ends are split or out of square.
$
What to buy2 × 2×4 boards, 8 ft long
Boards needed
2 boards · 2×4
Pieces from one board
5 pieces
Pieces placed
6 pieces
Offcut and kerf waste
50%
Total length of pieces
8 ft
Where to cut each board
BoardsCut these lengths (in)Offcut left
1 board16 + 16 + 16 + 16 + 16about 15-3/8 in
1 board16about 79-7/8 in

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Speed square (7 in)For a handful of cuts, a speed square guides a circular saw square across the board and marks every line in one move.
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Boards needed by number of 16 in pieces

Boards needed by number of 16 in pieces
PiecesBoards neededOffcut and kerf waste
6 pieces2 boards50%
12 pieces3 boards33%
20 pieces4 boards17%
30 pieces6 boards17%

What to know about cutting 16 in pieces from a 2x4

  • Blocking is 14½ in, not 16. Studs 16 in on center leave 14½ in between them, because each stud is 1½ in thick. Six 14½ in blocks come from one 8 ft 2×4 with about 8¼ in to spare.
  • Precut studs are shorter than 8 ft. Studs sold for 8 ft walls are usually 92⅝ in long. One still gives six 14½ in blocks, and still only five 16 in pieces.
  • The sixth piece is ⅝ in short. Five 16 in pieces and five cuts use 80⅝ in, leaving 15⅜ in. If a 15⅜ in piece works — a cripple under a window sill, a nailer — it is not waste.
  • Batch the cuts. Clamp a stop block on the miter saw fence at the length and cut every piece against it. Measuring each one off a tape adds a sixteenth here and there, and blocking that is too long bows the studs.

For a run of blocking, count the bays and buy by the table above: twenty blocks at 16 in take four boards, thirty take six. The same kerf problem at shelf length is worked through in How many 24 in pieces from an 8 ft board. Outdoors, the ends of Cut list for a 4×8 raised garden bed come two to a 2×6 with room for the kerf.

Different size? Use the full Cut List Calculator.

What you’ll need

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Frequently asked questions

How many 14 1/2 in blocks from an 8 ft 2x4?

6 pieces with a ⅛ in kerf, leaving about 8¼ in — enough blocking for six stud bays at 16 in on center.

How many 16 in pieces from a 10 ft 2x4?

7 pieces with a ⅛ in kerf — seven pieces and six cuts use 112¾ in.

How many 8 ft 2x4s for twenty 16 in blocks?

4 boards at five pieces per board, with about 15⅜ in left on each.

Other common sizes

Sources