How Many Board Feet in a 2x10?

When a 2x10 shows up on my order, it's usually because something has to span — a beam, a long joist, a stair stringer. These are the pieces that hold the structure up, so at 1.667 board feet per foot they're also the line items I double-check hardest. The per-foot rate is just the nominal cross section over twelve; if you want to see why that ratio holds for every length, it's worked through in the how to calculate board feet guide.

How many board feet are in a 2x10 by length?

A 2x10 packs the most wood per foot of any board on this set of pages — 25% more than a 2x8 of the same length. Here are the stocked lengths on both bases: the line the yard invoices and the line for the wood that shows up on your truck:

Left column: 1.667 BF × length. Right column: 1.15625 BF × length. Divide one by the other and the rate is constant at 1.44 — a 2x10 is billed at about 44% more volume than it delivers, no matter how long the stick is. Two ways I use that number: an invoice for 1,000 board feet of 2x10 is roughly 694 board feet of wood once the planer's share is removed, and every cubic foot that arrives is billed as about 17.3 board feet, not 12. If a 2x10 beam total ever looks inflated to you, that ratio is usually why, not a misread tape.

How do 2x4, 2x6, 2x8 and 2x10 compare board feet per foot?

Every nominal size bills on its label and delivers on its dressed size, but the gap between the two is not the same percentage for every stick — wide boards give up ¾″ of width, narrow ones only ½″. This one table is the whole family on both bases:

Read down the last column and the pattern shows: the deeper and wider the stick, the more the nominal label overstates the load it carries — but not smoothly, because thickness and width surface differently. Each size has its own worked page: how many board feet in a 2x4, how many board feet in a 2x6, and how many board feet in a 2x8.

Why does a 2x10 measure 9¼ inches wide?

Like the 2x8, a 2x10 is a wide board, so surfacing trims ¾″ off the width and it finishes at 9.25″ — not 9.5″ and certainly not the nominal 10. That actual width matters when you're sistering onto an existing joist or matching a stair rise, but the board feet stay pinned to the nominal 2×10 because softwood is sold that way. The rule for which boards lose ½″ versus ¾″ is spelled out in nominal vs actual dimensions.

How many board feet are in a built-up 2x10 beam?

Beams are where 2x10 board feet stack up literally. A built-up beam is just two or three 2x10s nailed or bolted together, so you add a full ply's worth of footage each time. Take a 3-ply beam, 16 ft long, carrying a deck:

• 3 plies × 16 ft = 48 linear feet of 2x10.
• 48 ft × 1.667 BF/ft = ~80 board feet billed in that one beam — about 55.5 BF (48 × 1.15625) of actual surfaced wood.

At a wide-stock rate near $0.90 per board foot (a planning estimate; long, wide 2x10 carries a premium) that beam is about $72 in lumber. Stack a couple of those plus the joists they carry and a deck frame climbs quickly — which is exactly why I tally the beams, joists, and rim in the cut list calculator and price the total in the lumber cost calculator before ordering.

One caution before you quote a client off that figure: the 80 BF is the billed number, worked from the nominal 2 × 10 the price list uses. The lumber you can actually sand is 1.5″ × 9.25″ = 1.156 BF per foot, so those same 48 feet are 55.5 board feet of wood — the nominal count runs 44% higher. You pay the 80; you glue up the 55.5. Neither number is wrong, but mixing them across two quotes is how a beam ends up costing more than the drawing said.

How many board feet are in a 2x10 floor?

When the span or the code table pushes you past 2x8 joists, picture that same 12 ft × 12 ft room framed 16″ on center with 2x10s:

• About 10 joists at 12 ft plus two 12-ft rim joists = 144 linear feet.
• 144 LF × 1.667 BF/ft = ~240 board feet billed, or about 166 board feet (144 × 1.15625) of actual surfaced wood.

A double 2x10 header over a 6-ft opening is the small-version of the same math: 12 linear feet, 20 board feet billed, about 13.9 BF delivered — before the king and jack studs around the opening. I keep both takeoffs, repetitive joists and one-off headers, in one sheet so the rim and blocking don't get forgotten; the guide to buying lumber by board foot is how I sanity-check the yard's tally line before I sign.

What are 2x10s used for?

The 2x10 lives in the structural backbone: long-span floor joists, deck beams (usually doubled or tripled), door and garage headers, and stair stringers where the 9¼″ depth gives room to cut the notches. It's also one of the heavier sticks to handle — a dry 16-footer runs around 48 lb, more when green or treated, which is its own reason to count carefully before a delivery. Need a shallower joist? A 2x8 covers shorter spans at lower cost per foot.

When is a triple 2x10 cheaper than an LVL?

On short deck beams under about 12–14 ft, three 2x10s often beat a single LVL on price and lead time at a local yard. Past that span, or when depth is limited by headroom, engineered lumber usually wins. Always check the span tables for your load and species — board feet tell you cost, not capacity. I price both options in the cost calculator before I commit.