Use this engineering calculation for a transparent preliminary estimate or independent arithmetic check when geometry, materials, loads, operating conditions, and units are defined consistently.

Effective Throat Millimeters (mm)

Required number input.

Weld Length Millimeters (mm)

Required number input.

Allowable Shear Megapascals (MPa)

Required number input.

Idealized fillet weld force from effective throat area and a supplied allowable throat shear stress; excludes code factors. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Allowable Force Newtons (N)

The resulting allowable force newtons returned as a number.

• Weld throat and strength calculations depend on weld process, effective length, profile, base and filler metals, load direction, eccentricity, fatigue, defects, inspection, heat effects, and governing code. Nominal geometry does not establish workmanship or capacity.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check assumptions against drawings, measurements, current material data, and the applicable design code. Apply required load combinations and safety factors, then obtain qualified review and testing for consequential designs.

• Bolt Shear Capacity

  Nominal single-shear force from bolt shear area times a user-supplied allowable shear stress; not a code-rated connection capacity.

• Bolt Tensile Capacity

  Nominal axial force from bolt tensile stress area times a user-supplied allowable tensile stress; excludes prying and interaction.

• Weld Throat Area

  Effective throat area for an equal-leg 45° fillet weld: leg/√2 times effective weld length.