Free Online Truss Calculator
Analyse roof trusses, bridge trusses, and structural trusses with our free structural analysis tool. Get member forces, reactions, and deflections in seconds—no signup or download required.
Truss Types You Can Analyse
AutoCalcs handles all common truss configurations. Whether you're designing a roof truss, checking a bridge structure, or analysing a custom truss geometry, get accurate results using finite element analysis.
Truss Configurations
- Roof trusses (pitched, flat)
- Warren, Pratt, Howe trusses
- Bridge trusses
- Custom truss geometries
Analysis Features
- Tension/compression-only members
- Pin-jointed analysis
- Self-weight calculation
- Multiple load combinations
Results
- Axial forces (tension/compression)
- Support reactions
- Node deflections
- Deflected shape visualisation
Modelling Tools
- Quick node placement
- Copy & mirror tools
- Section library
- Member end releases
Pin-Jointed Truss Analysis
For true truss behaviour where members carry only axial forces, use member end releases to create pin connections at joints. This gives you the classic truss analysis results—pure tension and compression in each member.
AutoCalcs also supports rigid connections if you need to analyse trusses with moment-carrying joints or want to check secondary bending effects.
Tension-Only and Compression-Only Members
Real trusses often include members that can only carry tension (cables, rods) or compression (struts that buckle in tension). AutoCalcs supports tension-only and compression-only members through the General analysis type, automatically iterating to find which members are active.
Why Choose AutoCalcs for Truss Analysis?
- Truly free — Full analysis capabilities with no paywalls
- No signup required — Start analysing immediately
- 2D and 3D — Analyse planar trusses or space frames
- Professional accuracy — FEA-based solver using the Direct Stiffness Method
- Access anywhere — Not tied to one computer, just open the web app