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Fillet Weld Shear Capacity Calculator

Calculate a fillet weld's nominal shear capacity from its leg size, electrode strength, and length.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-26 · v1.0.0

Market
Imperial · sales tax
0.66 ft
Schematic, drawn to the proportions you entered — not to scale on screen.

Nominal weld shear capacity

327.82 kN

High confidence
Effective throat thickness
0.22 in
Capacity per mm of weld
1.64 kN/mm

For the dimensions entered, expect a nominal weld shear capacity of 328 kN. Set for United States against IRC 2024. The market selector changes both the units and the code cited.

Add the equipment this sizes

This result is a specification — 327.822 kN — not a quantity. Put the thing it sizes into your project: how many, what you call it, and your supplier’s price.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • AISC 360 §J2.4 (Table J2.5): nominal weld strength Rn = 0.60×FEXX×Awe, where the effective throat Awe uses te = 0.707×leg size for an equal-leg fillet weld — consistent with AWS D1.1 Table 2.3

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Frequently asked questions

Why is the effective throat 0.707 times the leg size?
For an equal-leg fillet weld, the effective throat is the shortest distance from the root to the weld face, which geometrically works out to 0.707 (that is, cos 45°) times the leg size, per AISC 360 and AWS D1.1.
What's the difference between E70XX and E80XX electrodes?
The number denotes the electrode's classification strength FEXX — E70XX has FEXX = 483 MPa (70 ksi) and E80XX has FEXX = 552 MPa (80 ksi); a higher-strength electrode gives more shear capacity for the same weld size.
Does this include the base metal shear check?
No — this calculates only the nominal shear capacity of the weld metal itself (AISC 360 §J2.4). The connected base metal must also be checked for shear rupture along the fusion faces, which can govern for thinner connected material.