Weld Throat & Capacity Calculator
Calculate fillet-weld throat, effective area, screening shear capacity and required weld length from a user-supplied design stress.
“If I use a 6 mm fillet weld, how much shear can the weld carry under my chosen design basis?”
Fillet weld screening reference
a = 0.707 zA = a × L_eff × nV = τ_design × AFillet weld on bracket plate
Weld geometry and design basis
The entered design shear stress must come from your verified project design basis.
Fillet-weld screening
The result is only as valid as the design stress and effective length you entered.
This tool calculates geometry and capacity from a user-supplied design stress. It does not select the AS 4100 design stress, capacity factor, weld category, effective length rules or combined-load interaction for you.
Fillet-weld throat = 0.707 × leg size. Capacity = entered design shear stress × total effective throat area.
Save the calculation, not just the number.
Copy a permalink that reloads these inputs, or download a PDF record with inputs, visible results, assumptions, a sensitivity note, date and disclaimer.
A calculator can show the arithmetic. It cannot establish every requirement that applies.
Confirm the actual equipment, loading, materials, condition, jurisdiction, contractual requirements, standard edition and current project documentation before using the result for design, repair, testing or lifting decisions.
Ask an engineer about this calculation →