About the Weld Size Calculator Online Free Tool

The Weld Size Calculator Online Free Tool estimates fillet weld effective throat, throat area, and approximate shear capacity from leg size, weld length, and allowable stress.

How to Use the Weld Size Calculator Online

1. Enter fillet leg size and effective weld length.
2. Enter allowable shear stress for the weld design assumption.
3. Run the calculator to review throat, area, and approximate capacity.

Choosing Options Correctly

Use the correct allowable stress from the governing code and electrode/material combination. Load direction, weld group geometry, eccentricity, fatigue, inspection class, and code-specific reductions are not included.

Common Use Cases

• Estimate fillet weld capacity for preliminary sizing.
• Compare different leg sizes or weld lengths.
• Check hand calculations during fabrication review.

Quick FAQ

Does this replace weld code design?
No. It gives a simplified weld-size estimate and does not replace code checks, joint detailing, procedure qualification, or inspection requirements.

What throat factor is used?
For a standard equal-leg fillet weld, effective throat is commonly estimated as 0.707 times the leg size.

What loads are not covered by a simple size check?
Eccentric loading, fatigue, bending, combined stress, weld group geometry, base metal strength, and directional loading need separate design checks.

Can I use the result on drawings?
Only after checking the governing code, material, process, access, minimum/maximum weld sizes, and engineer or welding authority requirements.