LVL Beam Span Calculator

Free LVL beam span calculator. Estimate allowable span for laminated veneer lumber beams using simplified NDS formulas. Enter span, load, and application to get LVL beam size estimates with bending, shear, and deflection checks. Supports Microllam, Versa-Lam, and LP SolidStart reference values.

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LVL Beam Span Calculator, Construction, Free LVL beam span calculator. Estimate allowable span for laminated veneer lumber beams using simplified NDS formulas. Enter span, load, and application to get LVL beam size estimates with bending, shear, and deflection checks. Supports Microllam, Versa-Lam, and LP SolidStart reference values., lvl beam span calculator, lvl beam size calculator span tables, beam span calculator lvl, lvl beam calculator span tables, lvl beam span table calculator, lvl ridge beam span calculator, span calculator for lvl beams, microllam lvl beam span calculator, lvl beam spans calculator, lvl header beam span calculator, what size lvl beam for 20 foot span, how far can an lvl beam span, lvl beam load capacity calculator, laminated veneer lumber span calculator, lvl floor beam span chart, calc, compute

LVL Beam Span Calculator

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LVL Beam Span Calculator

Application

40 psf live load, 10 psf dead, L/360 | standard for residential floors

Required Span

Joist Span (Tributary)

Half the joist span on each side = total tributary width on the beam.

LVL Manufacturer

Fb = 2800 psi · E = 2.0 × 10⁶ psi

Advanced Options

Cost Estimate

Recommended LVL Beam

2-ply 14″ LVL

Generic LVL (3.50″ wide)

Max Span: 17′0″

Constraint Breakdown

Bending, shear, and deflection limits per NDS 2018. The smallest span governs.

Bending

18′7″(74% utilized)

fb = 2060.9 psi ≤ Fb′ = 2800 psi

Shear

30′4″(53% utilized)

fv = 150.3 psi ≤ Fv′ = 285 psi

Deflection · Governing (L/434)

17′0″(83% utilized)

Δ = 0.442″ ≤ L/360 = 0.533″

Allowable span is the minimum of all three constraints.

Beam Details

Weight, reactions, and load summary for the selected beam configuration.

Beam Weight

218 lbs

13.6 lbs/ft · 3.50″ × 14″ × 2-ply

End Reactions

4909 lbs

Per support — uniformly loaded simple span

Total Load on Beam

613.6 plf

480 plf live + 133.6 plf dead · 12 ft tributary

What Is an LVL Beam Span Calculator?

Find the right LVL beam size for your span, load, and application

This LVL beam span calculator estimates the allowable span for laminated veneer lumber (LVL) beams using simplified NDS 2018 beam formulas. Enter your span, load, and application to get an beam size estimate — including bending, shear, and deflection checks. Supports Microllam, Versa-Lam, LP SolidStart, and generic LVL with manufacturer reference values.

4 Manufacturers

Generic LVL, Microllam (2,900 psi Fb), Versa-Lam (2,600 psi), and LP SolidStart (2,900 psi) with reference design values.

3 Constraint Checks

Bending stress, shear stress, and live-load deflection per NDS 2018. The governing constraint is highlighted with utilization %.

3 Calculator Modes

Find Beam (auto-sizing), Check Beam (pass/fail), and Span Table (11 depths × 4 plies) — one tool for all your LVL questions.

Used by: builders sizing floor beams, contractors quoting LVL headers, architects specifying ridge beams, deck builders, and DIY homeowners planning renovations. LVL beams are stronger, straighter, and more dimensionally stable than sawn lumber — ideal for long spans where traditional lumber would sag or require deeper sections.

How Is LVL Beam Span Calculated?

NDS 2018 formula methodology — transparent and verifiable

This calculator follows the National Design Specification (NDS 2018) for wood construction. The allowable span is the minimum of three independent engineering constraints below. Adjustment factors for load duration (Cd), wet service (CM), and repetitive member use (Cr) are applied automatically based on your application selection.

Calculate Section Properties

b = plyCount × 1¾″ d = beam depth (in) A = b × d S = bd² / 6 I = bd³ / 12

Cross-sectional area (A), section modulus (S), and moment of inertia (I) determine bending and deflection resistance. Each LVL ply is 1¾″ wide.

Determine Load & Adjusted Design Values

w = (LL + DL) × tributary width / 12 (pli) Fb′ = Fb × Cd × Cr × CM Fv′ = Fv × Cd × CM E′ = E × CM

Total load combines live load (occupancy, snow) and dead load (beam weight, finishes). Adjustment factors: load duration (Cd=1.00–1.60) and wet service (CM=0.85–0.97). Repetitive member factor (Cr) is 1.0 for standalone beams per NDS Ch.8.

Solve Three Constraints

Bending: L_b = √(8 × Fb′ × S / w_total) Shear: L_v = 4 × Fv′ × A / (3 × w_total) Deflection: L_δ = (384 × E′ × I / (5 × D × w_live))^(1/3)

Bending limit depends on section modulus and allowable fiber stress. Shear controls short, deep beams. Deflection uses live load only — L/360 is standard for floors.

Governing Span = Minimum of All Three

Max Span = min(L_b, L_v, L_δ) (decimal feet) Convert to feet & inches for display

The shortest of the three constraints is the estimated allowable span. The governing constraint is highlighted in the results with its utilization percentage.

Worked Example: 16′ Residential Floor Beam

Generic LVL 2.0E, 3-ply 14″ beam, 12′ joist span, 40 psf live, 10 psf dead + self-weight, L/360

Self-weight = (5.25×14/144)×40 / 12 = 1.7 psf → effective dead load 11.7 psf
w_total = (40+11.7)×12/12 = 51.7 pli, w_live = 40×12/12 = 40.0 pli
3-ply 14″: b=5.25″, d=14″, S=171.5 in³, I=1200.5 in⁴, Fb′=2,800 psi (Cr=1.0)
L_bending = √(8×2,800×171.5/51.7)/12 = 22.7 ft
L_deflection = (384×2.0e6×1200.5/(5×360×40.0))^(1/3)/12 = 19.5 ft (governs)
Governing span = 19.49 ft (deflection controls, displayed as 19′ 5″ per conservative rounding) — PASS for 16′
At 16 ft: fb = 1,389 psi (50% utilized), Δ = 0.295″ / 0.533″ allowed
Beam weight = ~327 lbs, end reaction = 4,963 lbs per support

LVL Design Values Reference

Manufacturer-specific properties for 2.0E LVL beams

Manufacturer	Fb (psi)	Fv (psi)	E (×10⁶ psi)	Density (pcf)	Relative Strength
Microllam 2.0E	2,900	285	2.0	41	Strongest
Generic LVL 2.0E	2,800	285	2.0	40	Conservative avg
LP SolidStart 2.0E	2,900	285	2.0	40	Strong
Versa-Lam 2.0E	2,600	285	2.0	40	Standard

All 2.0E LVL products share the same modulus of elasticity (E = 2.0 × 10⁶ psi) and shear strength (Fv = 285 psi). The primary difference is bending strength (Fb), which ranges from 2,600 to 2,900 psi. For most residential applications, any of these products will perform similarly — the calculator uses Generic LVL (2,800 psi) as the default conservative value. For comparison, standard #2 Douglas Fir has Fb ≈ 1,500 psi — less than 60% of LVL strength.

Important: This calculator uses simplified NDS 2018 bending, shear, and deflection formulas. It does not apply manufacturer-specific depth/volume factors (Cv), beam stability factors (CL), product bearing limits, or shear deflection. LP SolidStart LVL is rated for dry-use only — do not select LP for deck or exterior applications. For final structural design, always consult manufacturer technical guides and a licensed engineer.

Standard LVL Beam Depths & Sizes

All 11 standard LVL depths used in the calculator

Depth	1-ply (1¾″)	2-ply (3½″)	3-ply (5¼″)	4-ply (7″)
5½″	S	S	M	M
7¼″	S	M	M	L
9¼″	M	M	L	L
9½″	M	L	L	L
11¼″	M	L	L	XL
11⅞″	L	L	L	XL
14″	L	L	XL	XL
16″	L	XL	XL	XL
18″	XL	XL	XL	XL
20″	XL	XL	XL	XL
24″	XL	XL	XL	XL

S = Short span (<12′), M = Medium (12–18′), L = Long (18–24′), XL = Extra Long (24′+). Actual spans depend on load, tributary width, and manufacturer. Use the Span Table mode for exact numbers.

Common LVL Beam Span Mistakes

Avoid these errors — most beam sizing problems are preventable

Forgetting the beam's self-weight

An LVL beam weighs approximately 40 lbs per cubic foot. A 2-ply 14″ × 20′ beam weighs ~230 lbs — adding about 11.5 plf of dead load. The calculator automatically includes beam self-weight in the design dead load which accounts for beam weight and finishes.

Ignoring wet service conditions

Where manufacturer-approved for exterior/wet use, wet-service factors reduce allowable bending by ~15% (CM=0.85) and stiffness by ~10% (CM=0.90). Deck applies wet service automatically. LP SolidStart is dry-use only. Verify exterior rating with the manufacturer.

Not providing lateral bracing

LVL beams need lateral bracing at supports and along the compression edge to prevent lateral-torsional buckling. Unbraced beams may fail at loads well below the calculated capacity. All results assume adequate bracing per NDS requirements.

Using the wrong tributary width

Tributary width is half the joist span on each side. If joists span 12′ on both sides, the tributary is 12′ (not 24′). For headers, include floor/roof loads from above. Ridge beams carry both sides of the roof.

Assuming simple-span works for all conditions

This calculator assumes a simple span (supported at both ends only). Continuous beams over multiple supports, cantilevers, and fixed-end conditions can carry significantly more load. Consult an engineer for non-standard support conditions.

Key Considerations

Getting the best result from your LVL beam project

Upgrade depth before adding plies for deflection

Deflection is proportional to 1/d³. Going from 9¼″ to 14″ depth increases stiffness by ~3.5×. Adding plies only helps bending and shear — if deflection governs, increase depth first.

Use the Span Table for quick comparison

Switch to Span Table mode to see all 44 options (11 depths × 4 plies) at once. Green cells meet your span requirement; red cells don't.

LVL vs sawn lumber: ~40% stronger

A 2-ply 11¼″ LVL spans about 40% further than a 4×12 sawn lumber beam at the same load due to higher design values (2,800 psi vs ~1,500 psi Fb).

Check bearing length

LVL beams need adequate bearing at supports — typically 1.5″ minimum for residential, more for heavy loads. Verify with local building codes.

Frequently Asked Questions

Common questions about LVL beam sizing, spans, and load calculations

For a typical residential floor load (40 psf live + 10 psf dead) with 12-foot joist span (12 ft tributary width), a 20-foot span typically requires a 2-ply 18″ LVL or a 3-ply 16″ LVL (Generic 2.0E). Deflection (L/360) and bending both control at this span. Microllam 2.0E (Fb=2,900 psi) may allow slightly smaller sections — use the calculator with your exact manufacturer, load, and tributary width for a precise recommendation. For heavy storage or garage floors, larger beams are needed.

LVL beams can span up to 60 feet or more depending on depth, ply count, and load conditions. A single 1¾″ × 11¼″ LVL can span approximately 14–16 feet for residential floors at standard loads. Doubling the beam depth roughly quadruples the span capacity since section modulus and moment of inertia increase with the square and cube of depth respectively. Use the calculator to input your exact span, load, and application for a precise result.

LVL beam span is governed by three design checks per NDS 2018: (1) Bending stress — actual fiber stress fb = M/S must not exceed allowable Fb′. Max span from bending: L = √(8·Fb′·S / w). (2) Shear stress — actual shear fv = 3V/(2A) must not exceed Fv′. Max span from shear: L = 4·Fv′·A / (3·w). (3) Deflection — actual live-load deflection Δ = 5wL⁴/(384EI) must not exceed L/360 for floors. The shortest of these three spans governs. Our calculator performs all three checks automatically using NDS 2018 formulas with manufacturer reference values.

For a uniformly loaded simple-span LVL beam, the governing formula is: L = min(√(8·Fb′·S / w_total), 4·Fv′·A / (3·w_total), (384·E′·I / (5·D·w_live))^(1/3)). Where: Fb′ = allowable bending stress (adjusted for Cd, CM, Cr), Fv′ = allowable shear stress, E′ = adjusted modulus of elasticity, S = section modulus (bd²/6), I = moment of inertia (bd³/12), A = cross-sectional area (b×d), w = load per linear inch, D = deflection limit divisor (360 for L/360). Each LVL ply is 1¾″ wide, so a 2-ply beam is 3½″ wide.

LVL (Laminated Veneer Lumber) typically has higher design values (Fb = 2,600–3,100 psi for 2.0E) than standard glulam, allowing slightly longer spans for the same depth. LVL is manufactured from thin veneers bonded under heat and pressure, giving it more consistent properties than sawn lumber or glulam. However, glulam is available in larger depths (up to 60″+) and is more cost-effective for spans exceeding 30 feet. LVL is more common in residential applications under 30 feet and is popular for headers, floor beams, and ridge beams. For the same depth, LVL typically spans 5–10% further than equivalent glulam.

Yes — adding plies increases the beam width (each ply adds 1¾″), which proportionally increases load-carrying capacity. A 2-ply LVL (3½″ wide) carries roughly twice the load of a 1-ply at the same span, or spans approximately 40% further with the same load. However, deflection limits often control longer spans regardless of ply count — adding plies helps bending and shear more than deflection. Use the calculator's Span Table mode to compare all depth × ply combinations at once.

Tributary width for a floor beam is half the joist span on each side. If floor joists span 12 feet on each side of the beam, the tributary width is 12 feet (not 24). The beam carries all floor load within its tributary area: Total Load = (Live Load + Dead Load) × Tributary Width. For a 12-foot tributary width at 50 psf total load, the beam carries 600 pounds per linear foot. Enter your joist span in the calculator to auto-calculate the tributary width. For headers, the tributary includes the opening width plus any floor or roof loads from above.

Yes, but LVL must be properly treated or protected for exterior use. Where manufacturer-approved for exterior use, wet-service factors reduce allowable bending by ~15% (CM=0.85) and stiffness by ~10% (CM=0.90). Deck mode automatically applies wet-service factors. For other exterior conditions, enable Wet Service in Advanced Options when the selected manufacturer supports it. LP SolidStart is rated dry-use only and is not suitable for exterior applications. LVL exterior use requires manufacturer approval and proper treatment. Always verify exterior rating with the manufacturer. For ground-contact applications, pressure-treated LVL or alternative materials may be required.

L/360 means the beam's maximum live-load deflection should not exceed 1/360th of its span. For a 20-foot (240-inch) span, the allowable deflection is 240/360 = 0.67 inches. This is the standard for residential floors to prevent cracking of drywall and plaster finishes. Use tighter limits for brittle finishes: L/480 for tile floors, L/720 for stone or marble. Roofs and ceilings often use L/240. The calculator includes all four limits (L/240, L/360, L/480, L/720) in the advanced options.

LVL weighs approximately 40–41 pounds per cubic foot. A single 1¾″ × 11¼″ × 16′ LVL beam weighs about 110 lbs. A 2-ply version (3½″ wide) weighs about 220 lbs. A 3-ply 14″ × 20′ beam weighs approximately 400 lbs. The calculator displays the beam weight for handling and installation planning. Beams over 150 lbs typically require two-person lifting or mechanical equipment. Always follow safe lifting practices and OSHA guidelines for material handling.

For a 16-foot garage door opening with 8-foot load width (typical single-story), 50 psf live and 15 psf dead: the calculator recommends a 2-ply 14″ LVL (Generic 2.0E) with approximately 18′ of estimated span. A 2-ply 11¼″ LVL spans about 14′ 6″ — too short for 16 ft. For two-story or heavy roof loads, a 3-ply beam may be needed. Use the calculator in Header mode with your exact opening width and load conditions.

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Last updated May 30, 2026

LVL Beam Span Calculator

Constraint Breakdown

Beam Details

What Is an LVL Beam Span Calculator?

How Is LVL Beam Span Calculated?

LVL Design Values Reference

Standard LVL Beam Depths & Sizes

Common LVL Beam Span Mistakes

Key Considerations

Frequently Asked Questions

Embed LVL Beam Span Calculator

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