Skip to content
Home ImprovementFree · No signup · 8.1K/month · $4.05 CPC

Lumber Calculator — Board Feet, Linear Feet & Cost by Species (2026)

Enter your cut list (nominal × count × length) and pick a species — get total board feet, total linear feet, piece count, cost range, and cross-species comparison. ALSC nominal-to-actual + NHLA + WWPA grading rules.

  • Instant result
  • Private — nothing saved
  • Works on any device
  • AI insight included
Reviewed by CalcBold Editorial · Sources: NHLA Hardwood Inspection Manual + WWPA grading rules + ALSC American Lumber Standard + 2026 retail pricingLast verified Methodology

Lumber Calculator

Format: "nominal,count,length" separated by | (pipe). Example: "2x4,20,8|2x6,5,10" means 20 pieces of 2×4×8 + 5 pieces of 2×6×10. Valid nominal: 1x2 through 6x6.

All four species priced in the alternatives row. Softwoods (PT pine, cedar) price by stick (linear); hardwoods (oak, walnut) price by board foot (volumetric).

Use this to override the species pricing with a specific local quote (per board foot). Leave 0 to use the calculator's default species pricing.

You might also need

Embed builderDrop the Lumber on your site →Free widget · 3 sizes · custom theme · auto-resizes · no signupGet embed code

How much lumber do I need? — short answer first

Enter your cut list as nominal,count,length separated by pipes — e.g. 2x4,20,8|2x6,5,10|4x4,4,8means 20 pieces of 2×4×8 + 5 pieces of 2×6×10 + 4 pieces of 4×4×8. For a typical small framing project (~30 pieces, ~100 board feet, pressure-treated pine), expect $170-280 retail. The calculator above runs your specific cut list through ALSC nominal-to-actual sizing and surfaces all four species at lifetime pricing for comparison.

What This Calculator Does

Drop your cut list (any combination of 1×2 through 6×6 nominal sizes, any count, any length) and pick a species — get total board feet (volumetric), total linear feet (sum of pieces times length), piece count, cost range, and cross-species comparison. Softwoods (PT pine, cedar) are priced per stick; hardwoods (oak, walnut) are priced per board foot. Custom $/board-foot override for specialty species or specific local quotes.

The Math / Formulas Used

Lumber dimensions are nominal (the pre-surfacing size) vs actual (the finished size after milling). A 2×4 is actually 1.5" × 3.5"; a 2×6 is 1.5" × 5.5"; a 4×4 is 3.5" × 3.5". The ALSC (American Lumber Standard Committee) PS 20-15 standard defines these dimensions; the calculator uses actual for the board-foot math but the nominal name everywhere else (because that’s how lumber is sold).

Pricing convention varies by species. Softwoods (pressure-treated pine, cedar, spruce-pine-fir) are typically sold per-stick at lumberyards + home centers — pricing is intuitive ($5-8 for a 2×4×8 PT). Hardwoods (oak, walnut, cherry, maple) are sold by board foot because cross-section varies widely. The calculator switches automatically based on species selection.

Cost benchmarks reflect 2026 US-average retail (Home Depot + Lowe’s pricing). Local lumberyards typically offer 10-25% bulk discounts for orders over $500. Hardwood prices are most volatile — supply chain shifts can move walnut from $15 to $25/bf and back within a year.

How to Use This Calculator

  1. Build your cut list. Format: “nominal,count,length” with pipes between entries. Valid nominal: 1x2 · 1x3 · 1x4 · 1x6 · 1x8 · 1x10 · 1x12 · 2x2 · 2x3 · 2x4 · 2x6 · 2x8 · 2x10 · 2x12 · 4x4 · 4x6 · 6x6. Length in feet.
  2. Pick species. PT pine for framing + ground contact · cedar for exposed weather · oak for furniture · walnut for premium.
  3. Set custom price (optional). Override species default with your local quote per board foot. Leave 0 for the calculator’s defaults.
  4. Read the verdict. Total board feet, linear feet, piece count, cost range, and cross-species comparison.
  5. Order with margin. Add 5-10% extra for cuts + mistakes. Most lumberyards accept returns within 30 days if unused.

Three Worked Examples

Example 1 — Small DIY deck framing: PT pine, 20 × 2×4×8 + 10 × 2×6×10 + 4 × 4×4×8

Cut list: 2x4,20,8|2x6,10,10|4x4,4,8. Total board feet: 20 × 3.5 + 10 × 5.5 + 4 × 9.3 = 162.4 bf. Total linear feet: 160 + 100 + 32 = 292 ft. Pieces: 34 total. PT pine cost: ~$280-440 retail. Cedar alternative: $600-780 (2.2× PT). PT wins on $; cedar wins on appearance. DIY-friendly volume, fits in a pickup or free delivery over $200 at most yards.

Example 2 — Fence wood: 40 × 2×4×8 + 200 × 1×6×8 (rails + pickets), cedar

Cut list: 2x4,40,8|1x6,200,8. Total board feet: 40 × 3.5 + 200 × 4 = 940 bf. Total linear feet: 320 + 1,600 = 1,920 ft. Pieces: 240 total. Cedar cost: ~$3,800-4,800 retail. Lumberyard quote recommended at this volume— typical 15-20% discount = ~$650-960 savings. PT alternative would be $1,800-2,400 (50% less than cedar) but doesn’t match curb-appeal target.

Example 3 — Furniture project: oak, 4 × 2×6×8 (table top) + 8 × 2×4×6 (legs/aprons)

Cut list: 2x6,4,8|2x4,8,6. Total board feet: 4 × 5.5 + 8 × 2.625 = 43 bf. Total linear feet: 32 + 48 = 80 ft. Pieces: 12. Red oak cost (~$6/bf mid): ~$170-340 retail. Walnut alternative: $430-1,075 — 2.5-6× the oak price.Specialty lumberyard required for select-grade hardwood — Home Depot stocks only construction-grade.

Common Mistakes

  • Forgetting nominal vs actual. A 2×4 is 1.5" × 3.5", not 2×4. If you size a stud cavity to exactly 4" thinking the 2×4 stud is 2" thick, the stud won’t fit (you need 3.5"). The calculator handles this; just use nominal names.
  • Using ‘Above Ground’ PT where ‘Ground Contact’ is required. Fence posts touching soil, retaining wall lumber, deck post-bases — all need GC-rated PT. The retail labels are similar but Above Ground rots in 3-7 years; GC lasts 20+. Always check the tag.
  • Paying for #1 grade on hidden framing. Wall studs, floor joists, roof rafters where appearance doesn’t matter — #2 grade is the structural standard + 30-40% cheaper. Save #1 for exposed beams + visible deck framing.
  • Skipping the lumberyard quote on bulk orders. Projects over $500 in lumber routinely save 10-25% at local lumberyards vs Home Depot + Lowe’s. They also stock #1 + select grades + species variety (cedar, redwood, oak) the big boxes don’t carry.
  • Buying exactly the cut list. Add 5-10% extra for cuts + mistakes. Lumber returns are easy within 30 days if unused. Running out mid-project means an extra trip + delays + sometimes mismatched batches (color/grain).
  • Using construction-grade for furniture. Home Depot stocks #2 SPF and #2 PT — fine for framing. Furniture needs select-grade hardwood from a specialty yard or online (Bell Forest, McKusick, Woodcraft). Construction-grade has too many knots + grain irregularities for furniture work.

Methodology & Sources

Nominal-to-actual dimension standard: ALSC PS 20-15 American Softwood Lumber Standard — the authoritative US standard. Hardwood pricing convention (per board foot) + measurement methodology: NHLA Hardwood Inspection Manual (National Hardwood Lumber Association). Softwood grading rules (#1, #2, Select definitions): WWPA Standard Grading Rules(Western Wood Products Association). Per-stick + per-board- foot pricing benchmarks: 2026 retail at Home Depot + Lowe’s, validated against industry lumberyard reference data. Hardwood prices are volatile — verify current quotes before bulk orders.

How to Read the Verdict

  1. Under 30 board feet — small project. Repair work, small DIY furniture, single-room framing. Fits in a pickup or carries home from the store. Buy 5-10% extra for cuts.
  2. 30-150 board feet — moderate project. Deck framing, fence runs, room additions. Schedule lumberyard pickup with a trailer or free delivery (typically over $200 order).
  3. 150+ board feet — large project. Whole-room or whole-house framing, large fence or deck. ALWAYS get a lumberyard quote — typical 10-25% discount vs retail + #1 grade selection + species variety. Stage on the job site since 2-3 trips will be needed.
  4. Hardwood projects — specialty yard. Oak / walnut / cherry / maple in select grade require a specialty lumberyard or online supplier. Home Depot stocks only construction-grade lumber. Online options: Bell Forest, McKusick, Woodcraft.
  5. Any ground-contact application — GC-rated PT mandatory. Fence posts touching soil, retaining wall lumber, deck post-bases. Check the tag for “Ground Contact” or “GC” rating specifically — not just “Above Ground”.

Lumber pairs with most structural projects. For DIY deck framing, the deck cost calc handles labor + add-ons after the lumber math. For fences, the fence calc handles post-count + concrete + picket math. Foundations below the framing: the concrete calc sizes the cu yd needed. Interior framing gets drywall after — the drywall calc handles sheets + mud + tape.

Sources & Methodology

The formulas, thresholds, and benchmarks behind this calculator are anchored to the primary sources below. Where a study or agency document is the underlying authority, we link straight to it — not a summary or republished version.

  1. American Lumber Standard Committee (ALSC) — PS 20-15 American Softwood Lumber Standard· American Lumber Standard Committee

    Authoritative US standard defining nominal vs actual lumber dimensions (2×4 = 1.5" × 3.5", 2×6 = 1.5" × 5.5", 4×4 = 3.5" × 3.5"). Used in the calculator's board-foot math.

    Accessed

  2. National Hardwood Lumber Association — Hardwood Inspection Manual· NHLA

    Industry-standard hardwood grading + measurement reference. Source of the board-foot pricing convention for hardwoods (vs per-stick pricing for softwoods).

    Accessed

  3. Western Wood Products Association — Standard Grading Rules· WWPA

    Authoritative grading rules for Western softwood lumber (Douglas-fir, hem-fir, SPF). Source for #1, #2, Select grade definitions referenced in the calculator's grade FAQ.

    Accessed

Frequently Asked Questions

The most common questions we get about this calculator — each answer is kept under 60 words so you can scan.

  • What's a board foot?
    A board foot (bf) is a volumetric measure of lumber: 144 cubic inches, calculated as (thickness_inches × width_inches × length_feet) / 12. A standard 2×4×8 ft = (1.5" × 3.5" × 8') / 12 = 3.5 bf. Hardwood is typically sold by the board foot (volumetric pricing); softwood + dimensional lumber is typically sold by the stick (per-piece pricing).
  • Why is a 2×4 actually 1.5×3.5?
    Lumber dimensions are nominal (the pre-surfacing size) vs actual (the finished size after milling). The American Lumber Standard (ALSC) defines: 2×4 → 1.5×3.5 · 2×6 → 1.5×5.5 · 4×4 → 3.5×3.5. The calculator uses actual dimensions for board-feet math but the nominal name everywhere else (because that's how lumber is sold). This is why a 'six-foot 2×4' is actually 1.5"×3.5" cross-section.
  • Should I price lumber by stick or by board foot?
    Softwoods (pressure-treated pine, spruce, fir, cedar) are typically sold per-stick at lumberyards + Home Depot/Lowe's — pricing is intuitive ($5-8 for a 2×4×8 PT). Hardwoods (oak, walnut, cherry, maple) are sold by board foot since cross-sections vary widely. The calculator switches automatically: softwoods price by stick (using 2×4×8-equivalents); hardwoods price by board foot.
  • What's the difference between pressure-treated and untreated lumber?
    Pressure-treated (PT) wood is infused with preservatives (CCA, ACQ, MCA) to resist rot + insects + ground contact. It's the standard for outdoor framing — deck joists, fence posts, retaining walls. Untreated softwood (SPF — spruce-pine-fir) is for indoor framing only — wall studs, floor joists, roof rafters. Cost: PT is ~30-50% more than untreated. For ground-contact applications (anything touching soil), use PT rated 'Ground Contact' (GC) — not 'Above Ground' (AG).
  • When should I use cedar vs pressure-treated?
    Cedar wins where appearance matters: exposed siding, fencing facing the street, deck surfaces (visible boards). Cedar weathers gray naturally without staining; PT looks rough even when new. PT wins where appearance doesn't matter + structural strength does: deck framing, fence posts, retaining walls. Cost: cedar is ~2× PT. Combined approach is common: PT framing + cedar surface boards.
  • What's the difference between #1, #2, and select grade lumber?
    Lumber grades reflect knot count + grain quality. Select (or 'Premium'): minimal knots, clear grain — furniture + visible trim. #1: small knots, structural-grade — visible framing where appearance matters. #2: more knots, standard structural — most framing. #3: many knots, low-cost — temporary or rough framing. Most home centers stock #2 SPF and PT; specialty lumberyards have #1 + select for exposed framing.
  • How do I read a lumberyard cut list?
    Cut list format varies but most yards accept: "qty × nominal × length". Example: "10 × 2×4 × 8'" means 10 pieces of 2×4 at 8' length. Some yards prefer board-foot totals for hardwood; some quote per-stick for softwood. The calculator above accepts the format "nominal,count,length" separated by | (pipe) — paste this directly into the lumberyard's online order form or email.
  • Should I buy lumber at Home Depot or a lumberyard?
    Home Depot + Lowe's win on convenience + small quantities + financing. Local lumberyards win on contractor pricing (10-25% below retail for bulk orders), grade selection (#1 + select available), and species variety (cedar, redwood, oak, walnut). For projects over ~$500 in lumber, get a lumberyard quote — the discount usually beats the convenience.