Lvl Span Calculator
Calculate the maximum span for Laminated Veneer Lumber (LVL) beams based on beam size, load, and species.
Published by:
isCalculator Editorial Team
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Lvl Span Calculator Guide
This calculator estimates the maximum allowable span (in feet) for a wood beam based on its dimensions, load, and species. All inputs are in imperial units (inches and psf).
- Enter Beam Width – Input the beam width in inches (e.g., 3.5). Common values: 1.5, 3.5, 5.25, 7.
- Enter Beam Depth – Input the beam depth in inches (e.g., 11.875). Common values: 5.5, 7.25, 9.5, 11.875, 14, 16, 18, 20.
- Enter Total Load – Input the total load in pounds per square foot (psf). This is dead load + live load (e.g., 40 live + 10 dead = 50 psf). Range: 10–200.
- Select Species/Grade – Choose from Douglas Fir-Larch, Southern Pine, Hem-Fir, or Spruce-Pine-Fir. This adjusts the beam’s strength.
- Click “Calculate Span” – The result shows the maximum span in feet, calculated from both bending and deflection limits. Press Enter in any input to calculate.
Output: The maximum span (in feet) is displayed, along with a formula breakdown showing the bending and deflection calculations.
Previous Results
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Frequently Asked Questions
Laminated Veneer Lumber (LVL) is an engineered wood product made from multiple layers of thin wood veneers glued together. It is used for beams, headers, and other structural applications where high strength and dimensional stability are required.
The calculator uses simplified engineering formulas based on bending stress and deflection. The bending span is derived from the flexural formula M = Fb * S, and the deflection span is based on L/360 criteria. The final span is the smaller of the two.
Common LVL beam widths are 1.5, 3.5, 5.25, and 7 inches. Depths range from 5.5 to 20 inches in 1.5-inch or 2-inch increments. Always consult local building codes and engineering tables for final design.