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Calculate self-inductance for single-turn rectangular wire loops and PCB loop antennas from trace width, thickness, and dimensions.
PCB / Wire Loop
Use W, H and d to estimate a rectangular loop made from wire or conductor track.
EMI Loop Estimate
Loop inductance matters in switching paths, RF loops, pulsed circuits and grounding layouts.
This colorful SVG redraw shows rectangular loop width W, height H and conductor diameter d.
This calculator is useful for rectangular conductor loops, PCB current loops, RF loops and EMI-sensitive paths.
A rectangular loop has inductance because current flowing around the loop creates magnetic flux. Wider and taller loops generally increase inductance, while conductor diameter affects the logarithmic part of the estimate. This is important in switching power layouts, pulse circuits, grounding loops, antenna experiments and loop sensors.
It is the inductance created by current flowing around a rectangular loop conductor.
Use μr = 1 for air or non-magnetic surroundings.
Wire diameter changes the magnetic field distribution close to the conductor and appears in the logarithmic part of the formula.
It can give a rough estimate, but PCB trace geometry and return path can change real inductance.
Yes. The formula multiplies by turns squared.
No. It is an engineering estimate and should be verified for precision RF or pulse designs.
Rectangular Loop Inductance Calculator (PCB Trace & Wire Loop) is a free online calculator tool. Use it to get instant, accurate results for your electronics calculations.