Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Inner diameter

Required number input.

Outer diameter

Required number input.

Compute coaxial cable inductance per meter as 200 x ln(d_outer/d_inner) nH/m from the loop inductance mu_0/2pi x ln(b/a). 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]

Inductance per meter (nH/m)

The resulting inductance per meter returned as a number.

• Closed-form transmission-line estimates assume a particular geometry, homogeneous or effective dielectric, conductor model, and frequency range. Fabrication tolerances, copper roughness, dispersion, solder mask, connectors, vias, and return-path discontinuities require field solving or measurement for precision work.
• 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 the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• Coax C Per Meter

  Compute coaxial cable capacitance per meter as 24.1 x er / ln(d_outer/d_inner) with diameters in matching units.

• Toroid Inductance

  Compute toroid inductance in microhenries as AL (nH per turn squared) times the square of the turns divided by 1000.

• CAN Bit Rate from Cable Delay

  Estimate a CAN bit-rate ceiling using cable length, one-way propagation delay per metre, transceiver delay, and the permitted propagation fraction of a bit. This is a timing-budget estimate, not a substitute for bit-timing analysis.