Deck Beam Calculator — Calculate Deck Beam Sizes and Spans

Deck Beam Calculator

Calculate proper deck beam sizes for your construction project. Determine beam span, sizing, and load capacity for safe deck design.

Step 1: Deck Dimensions

Understanding Beam Spans

Beam span is the distance between supports. Longer spans require larger beams or closer support spacing. Always check local building codes for specific requirements.

Step 2: Beam Specifications

About Beam Sizing

Beam size is determined by span, load, and material strength. Larger decks and heavier loads require thicker and deeper beams to prevent sagging or failure.

Deck Beam Analysis Results

Summary
Beam Comparison
Span Analysis

Recommended Minimum Beam Size

2×10
Safety Factor: 1.8
Structurally Safe
Maximum Allowable Span
14.2 ft
Calculated Deflection
0.42 in
Load Capacity
1,850 lb
Required Support Spacing
6.5 ft

Beam Size Comparison

Beam Size Material Max Span (ft) Deflection (in) Safety Factor

Span Capacity Analysis

Beam Sizing Formula

Beam Capacity = (Material Strength × Section Modulus) / Safety Factor

The beam capacity is calculated based on material bending strength, cross-sectional properties, and required safety factors. Always consult local building codes for specific requirements.

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