Engineering & Construction
Weld Size Calculator
Calculate the throat of a fillet weld as leg ÷ √2, then a capacity from the length and the allowable stress you enter.
Free forever.
Throat of a fillet is leg ÷ √2. Capacity is throat × length × the allowable stress you enter. The stress is not supplied by a code inside this tool.
Result
Press Calculate.
Result
Press Calculate.
How to use the Weld Size Calculator
- Enter the leg size and the weld length.
- Enter the allowable stress you are using.
- Read the throat and the capacity.
Questions
Where does the stress come from?
From you. The tool does not look up a code stress.
What is the throat?
The shortest distance through the fillet. For an equal-leg fillet it is the leg divided by √2.
This runs entirely in your browser. Nothing you type is sent to a server.

