Weld Size Calculator

Required fillet weld throat/leg size for a given shear load.

Applied load P (N)Weld length L (mm)Allowable shear stress (MPa)Calculate

Equations

Required throat t = P / (0.707 × L × τallow). Leg size ≈ t / 0.707.

Assumptions

Simple transverse fillet weld in direct shear only — does not cover eccentric/torsional weld groups or fatigue.