// Free Engineering Tool

Fillet Weld Strength Calculator

Size and check fillet welds to Eurocode EN 1993-1-8 or AISC 360. Enter leg size, weld length and applied load, and get effective throat, design shear strength, capacity and utilisation instantly — plus a full capacity table across common weld sizes and lengths. Verified against standard worked examples.

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Weld & Load

Leg Size

Weld Length

Steel Grade

Electrode

Load Direction

Applied Load

EN 1993-1-8 simplified method: f_vw,d = f_u / (√3·β_w·γ_M2), capacity = f_vw,d × throat × length. Throat a = 0.707 × leg. γ_M2 = 1.25. For preliminary design — verify weld group geometry and eccentricity separately.

AISC 360 (LRFD): φR_n = φ·0.6·F_EXX·throat, φ=0.75. Transverse welds gain up to 50% (directionality factor). For preliminary design — check base metal capacity and weld group effects separately.

Results

Capacity per mm—

Total Weld Capacity—

Effective Throat—

Design Shear Strength—

Utilisation—

Status—

Capacity Table — Leg Size vs Weld Length

Leg (mm)	Throat (mm)	Per mm (kN)	100mm	200mm	300mm

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