Issue 1 V1.08
Details Here

Continuous Beam - Two Unequal Span With UDL

More Beams

StructX Calculator
Beam Calculator Input Units:
Length of Span, a:
Length of Span, b:
Load on Beam, w:
Point of Interest, x1:
Point of Interest, x2:
Resultant, R1=V1:
Resultant, R2:
Resultant, R3=V4:
Shear, V2:
Shear, V3:
Moment, M1:
Moment, Mx1:
Moment, Mx2:
Remember: 1m = 1000mm ; 1N/mm = 1000N/m ; 1Nm = 1000Nmm
1ft = 12in ; 1lbf.ft = ; 12lbf/ft = 1lbf/in

The above beam force calculator is based on the provided equations and does not account for all mathematical and beam theory limitations. The calculator has been provided with educational purposes in mind and should be used accordingly. Unit conversion

Continuous Beam - Two Unequal Span With a Uniformly Distributed Load

Need a excel spreadsheet for designing the above beam, click Here!

Notation and Units

Metric and Imperial Units

The above beam design formulas may be used with both imperial and metric units. As with all calculations care must be taken to keep consistent units throughout with examples of units which should be adopted listed below:


  • FBD = free body diagram
  • SFD = shear force diagram
  • BMD = bending moment diagram

  • a & b = span length under consideration, in or m
  • M = maximum bending moment, or kNm
  • R = reaction load at bearing point, lbf or kN
  • V = maximum shear force, lbf or kN
  • w = load per unit length, lbf/in or kN/m
  • x = horizontal distance from reaction point, in or m