19 interactive calculators for the hand calculations hardware engineers actually do — beam deflection, bolted joint preload, press fits, tolerance stack-up, thermal resistance and more. Every input is a slider, every output updates in real time, and every calculator draws what it computes.
Each formula is implemented from a published reference — Shigley, Roark, VDI 2230, ASTM, IPC — and verified against hand-computed test vectors that run in CI. Where a model makes a simplifying assumption, the assumption is stated on the calculator rather than buried.
Bending, shear and deflection for beams and cantilevers.
Preload, torque, thread strength and interference fits.
Rate, stress and solid height for compression springs.
Squeeze, gland fill and gasket sealing force.
Statistical tolerance methods and process capability.
Heat spreading and junction temperature through the thermal resistance chain.
Trace resistance, dividers, contact resistance and crystal oscillators.
Switching regulators, power-stage losses and PDN impedance.
Controlled impedance and high-speed interconnect.
Near-eye display geometry and magnetic hold force.
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