Lvl Beam Size Calculator

LVL Beam Size Calculator

Note: This calculator provides an estimated beam size and span only. Always consult a structural engineer before construction.

Calculating your LVL beam size…

LVL Beam Size Results

Required Beam Size:
Maximum Allowable Span:
Estimated Deflection at Midspan:
Total Load Supported:
Safety Check:

When it comes to structural framing, Laminated Veneer Lumber (LVL) beams are a go-to choice for builders, contractors, and homeowners. They provide strength, stability, and reliability when spanning large distances under heavy loads. But determining the right LVL beam size isn’t always straightforward—especially when safety, deflection, and load-bearing limits are involved.

That’s where the LVL Beam Size Calculator comes in. This free online tool helps you quickly estimate the proper beam size, maximum allowable span, mid-span deflection, and safety checks. Whether you’re working on a deck, roof, or floor system, this calculator provides a reliable starting point before consulting with a structural engineer.

How to Use the LVL Beam Size Calculator (Step-by-Step)

Using the tool is simple, even if you’re not an engineer. Follow these steps:

  1. Enter the Beam Span (ft)
    • Input the total span length of your beam in feet. This represents the distance between supports.
  2. Enter the Total Load (psf)
    • Provide the estimated load applied to the beam in pounds per square foot. This includes both dead load (weight of materials) and live load (people, furniture, snow, etc.).
  3. Enter the Beam Spacing (ft)
    • Input the spacing between beams in feet. This helps calculate how the load is distributed.
  4. Select LVL Grade
    • Choose between common LVL grades: 2.0E, 1.9E, or 1.8E. A higher modulus of elasticity (E) means stronger and stiffer beams.
  5. Select Beam Depth (inches)
    • Choose from standard LVL depths such as 9-1/2″, 11-7/8″, 14″, or 16″.
  6. Select Number of Plies
    • Choose the number of plies (1, 2, or 3). Each ply typically adds 1.75 inches to the beam’s total width.
  7. Click “Calculate”
    • The tool will display results, including:
      • Required beam size
      • Maximum allowable span
      • Mid-span deflection
      • Total load supported
      • Safety check (Pass/Fail)
  8. Reset if Needed
    • You can clear all inputs and start again with the “Reset” button.

Example: Calculating an LVL Beam

Let’s say you need to design a beam for a 20-foot span to support a floor with a total load of 60 psf. The beams are spaced 12 feet apart, and you choose a 2.0E LVL, 14-inch deep, 2-ply beam.

After entering the values into the calculator and hitting “Calculate”, you’ll see results such as:

  • Required Beam Size: 2 ply 14″ LVL (3.50″ wide)
  • Maximum Allowable Span: ~22.3 ft
  • Estimated Deflection at Midspan: ~0.75 in
  • Total Load Supported: 720 plf
  • Safety Check: Pass

This quick calculation provides confidence that your beam selection is suitable before finalizing your design.

Benefits of Using the LVL Beam Size Calculator

✅ Fast & Easy: Get instant estimates without manual calculations.
✅ Accurate: Uses industry-standard formulas for bending, deflection, and safety.
✅ Practical: Perfect for builders, engineers, architects, and homeowners.
✅ Customizable: Enter span, load, spacing, and beam properties to match your project.
✅ Helpful for Planning: Ensures materials are sized properly before purchasing.
✅ Safety-Oriented: Provides a “Pass/Fail” safety check for peace of mind.

Features of the Tool

  • User-Friendly Interface – Simple inputs with drop-down menus.
  • Progress Bar – Shows calculation progress.
  • Detailed Results – Beam size, span, deflection, load, and safety.
  • Copy & Share Options – Copy results to clipboard or share via link.
  • Reset Function – Start fresh with one click.
  • Important Note Box – Reminds users to consult a structural engineer.

Use Cases

  • Deck Construction – Calculate LVL sizes for deck beams and girders.
  • Floor Systems – Determine proper LVL dimensions for heavy floor loads.
  • Roof Supports – Estimate LVL size for rafters and ridge beams.
  • Garage Headers – Find appropriate sizes for large door openings.
  • Home Renovations – Ensure safe structural upgrades during remodeling.

Pro Tips for Best Results

  • Always round up to the next beam size for safety.
  • Consider live load factors such as snow, wind, or occupancy.
  • For beams carrying roof loads, adjust load input accordingly.
  • If the safety check fails, increase beam depth or number of plies.
  • Use the calculator as a guide only—final approval should come from a licensed structural engineer.

Frequently Asked Questions (FAQ)

Here are 20 common questions and answers about the LVL Beam Size Calculator:

  1. What does LVL stand for?
    LVL stands for Laminated Veneer Lumber, a type of engineered wood beam made from thin wood veneers bonded with adhesives.
  2. Why use an LVL Beam Size Calculator?
    It provides quick, accurate estimates of beam size, span, and load capacity, saving time and reducing errors.
  3. Is this calculator accurate for all projects?
    It gives reliable estimates but should be used as a preliminary guide only. Always confirm with a structural engineer.
  4. What inputs are required?
    Span, load, spacing, LVL grade, depth, and number of plies.
  5. What is the modulus of elasticity (E)?
    It’s a measure of stiffness. LVLs typically range from 1.8E to 2.0E, with higher values meaning stiffer beams.
  6. How many plies can I use?
    Most calculators support 1–3 plies, but beams can be built with more depending on structural needs.
  7. What does “Safety Check” mean?
    It verifies whether the beam passes bending and deflection limits.
  8. What happens if my beam fails the safety check?
    Increase the beam depth, add more plies, or reduce the span/load.
  9. What is deflection?
    Deflection is the amount a beam bends under load, measured in inches at mid-span.
  10. What is the maximum deflection allowed?
    Typically L/360 of the span, where L is the beam length in inches.
  11. Can I use this calculator for steel or concrete beams?
    No, it is designed only for LVL beams.
  12. What is the standard LVL width per ply?
    Each ply is typically 1.75 inches wide.
  13. What loads should I include?
    Both dead load (materials) and live load (people, furniture, snow, etc.).
  14. Can I use this for outdoor decks?
    Yes, as long as you input the correct load values.
  15. Does this calculator account for shear strength?
    It primarily checks bending and deflection, not shear.
  16. What is the maximum span an LVL can cover?
    Depending on size, LVL beams can span up to 60 feet, but always check engineering specs.
  17. What does “Uniform Load” mean?
    It’s the evenly distributed load along the entire length of the beam.
  18. Can this calculator help me size a ridge beam?
    Yes, if you enter the correct span and roof load.
  19. How do I copy or share results?
    Use the built-in Copy Results or Share Results buttons.
  20. Do I still need an engineer if I use this tool?
    Absolutely. The calculator is an estimation tool, not a replacement for professional engineering advice.

Conclusion

The LVL Beam Size Calculator is a powerful, easy-to-use tool for quickly estimating beam sizes, spans, and load capacities. While it provides an excellent starting point for planning your construction project, always confirm with a licensed structural engineer before moving forward.

Whether you’re building a deck, supporting a floor, or renovating a home, this calculator ensures you make safe, informed decisions.