Truss Solver
Enter your span and load per foot to get the total load and the support reactions at each end.
What your result means
Total load is the span times the load per foot. For a simple, symmetric truss under a uniform load, each support carries half, so the two reactions are equal. This gives you the bearing forces only, not the forces in the individual members, which need a full method-of-joints analysis or engineering software.
How to use this calculator
- Enter span in feet.
- Enter total load per linear foot (dead + live).
- Read total load and support reactions (left and right).
- For complex truss designs, consult a structural engineer.
- Reactions are forces at the bearing points.
The formula
Total load is the span times the load per foot. With a symmetric truss and a uniform load, each support carries half the total, so both reactions are the total divided by two.
Worked example
Say you've got a 24 ft span carrying 50 lbs a foot. That's a 1,200 lb total load, split evenly as 600 lbs at each support.
Load types
| Load type | What it is |
|---|---|
| Dead load | Permanent weight of the structure |
| Live load | Occupants, snow, wind, furniture |
| Reaction | Upward force at each support |
Tips & gotchas
- For a simple truss with a uniform load, each reaction is the total divided by two.
- Real trusses carry forces in each member; this gives reactions only.
- For a full member-force analysis, use engineering software.
- Always verify engineered trusses with the manufacturer.
- Dead load is the structure's own weight; live load is people, snow, and wind.
Frequently asked questions
What is a truss reaction?
The upward force at each support that balances the downward loads.
Can I design my own trusses?
For simple structures, yes. Anything load-bearing, hire an engineer.
What's the difference between dead and live load?
Dead load is permanent weight; live load is movable, like people, snow, and wind.
How are trusses analyzed?
By the method of joints or method of sections. Engineering software handles the full analysis.
What if my truss has point loads?
This solver is for uniform loads only. Point loads need a full analysis.
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