Mechanical Engineering Tools

Free mechanical and structural engineering calculators that run entirely in your browser — beam deflection and stress, moment of inertia, section modulus, column buckling, bolt torque, spring rate, hardness conversion, tap-drill sizes, factor of safety, pressure vessel wall, shaft torsion, thermal expansion and sheet-metal bend allowance. Nothing uploaded.

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Beam Deflection Calculator

Compute the maximum deflection and slope of a simply-supported, cantilever, or fixed-fixed beam under a point or uniformly distributed load.

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Beam Bending Stress Calculator

Find the maximum bending stress from the flexure formula σ = Mc/I plus the transverse shear stress in a beam cross-section, in MPa or psi.

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Area Moment of Inertia & Centroid Calculator

Compute area, centroid, and area moment of inertia (Ix, Iy) for rectangle, solid circle, hollow tube, and I-beam cross-sections.

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Section Modulus & Radius of Gyration Calculator

Derive elastic section modulus S = I/c and radius of gyration r = √(I/A) from a section's properties, with an optional required-S check from moment and allowable stress.

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Euler Column Buckling Calculator

Compute the Euler critical buckling load Pcr = π²EI/(KL)² and critical stress of a slender column, with selectable end conditions and a yield-limit check.

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Bolt Torque Calculator

Calculate the tightening torque needed to reach a target bolt preload using T = K·D·F, for metric class 8.8/10.9/12.9 and SAE Grade 2/5/8 fasteners.

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Helical Compression Spring Calculator

Compute spring rate k = Gd⁴/(8D³Na), deflection, spring index, Wahl-corrected shear stress, and solid height for a round-wire helical compression spring.

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Hardness Conversion Calculator

Convert steel hardness between Rockwell HRC, HRB, Brinell HB, Vickers HV and Knoop HK, with an approximate tensile-strength estimate.

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Tap Drill & Thread Size Calculator

Find the correct tap-drill diameter, pitch, pitch diameter and clearance-hole sizes for metric and UNC/UNF threads at any thread engagement.

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Factor of Safety Calculator

Compute factor of safety and margin of safety from material yield/ultimate strength and applied stress, with von Mises combined-load support.

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Thin-Wall Pressure Vessel Stress Calculator

Compute hoop and longitudinal stress, or required wall thickness, for thin-walled cylindrical and spherical pressure vessels, with an ASME option.

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Shaft Torsion Calculator

Compute torsional shear stress, angle of twist and polar moment for solid or hollow circular shafts from torque or from power and rpm.

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Thermal Expansion Calculator

Calculate linear, area and volumetric thermal expansion of a material from a temperature change, plus constrained thermal stress, with a materials table.

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Sheet Metal Bend Allowance Calculator

Compute bend allowance, bend deduction, outside setback and flat-pattern length for a sheet-metal bend using the K-factor method.

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