Fabrication and Structural Calculators

Every calculator and chart on the site, grouped by the job. Each one shows the formula and the steps with your numbers, keeps its inputs in the link so you can share or repeat a result, and prints a dated record. Nothing you type is uploaded.

Bolts and fasteners

• Bolt size chart — inch and metric bolt sizes, threads, head sizes and a bolt size finder.
• Bolt head size chart — wrench and hex key sizes, SAE to metric equivalents.
• Bolt torque calculator — tightening torque and preload by grade or property class.
• Bolt grade chart — SAE and metric grade markings, strengths and the proof load of a bolt size.
• Bolt shear strength calculator — shear capacity of bolted joints.

Springs

• Spring rate calculator — compression spring rate, load and stress.
• Garage door spring calculator — torsion spring IPPT and the turns a door needs.

Beams and sections

• Beam deflection calculator — deflection, slope and reactions.
• Shear moment diagram calculator — shear force and bending moment diagrams.
• Beam load calculator — the maximum load a beam section carries.
• Moment of inertia calculator — area moment, section modulus and centroid.
• Centroid calculator — centroid, area and Ix, Iy of a shape built from rectangles, triangles, circles and holes.
• Column buckling calculator — Euler and Johnson critical loads.

Stress and structures

• Stress calculator — axial, shear, bending and torsional stress.
• Principal stress calculator — principal stresses, von Mises and Mohr’s circle.
• Hoop stress calculator — pipes and pressure vessels, Barlow’s formula.
• Factor of safety calculator — safety factor, allowable stress and margin.
• Cable sag calculator — cable tension from span and sag, or sag from tension, with a midspan load.
• Truss calculator — member forces by the method of joints.

Sheet metal, coil and tube

• Press brake tonnage calculator — air bending force.
• Punching force calculator — punch tonnage for any hole shape.
• Pipe bending calculator — bend length, setback, gain and offsets.
• Coil length calculator — strip length in a coil from size or weight.
• Blank size calculator — blank diameter for deep drawn cups.