Skip to content

Inductor Design Tool

4 views Free
Inductor Design Tool | Coil and Planar Spiral Inductance Calculator
TYPE
mm
mm
N
Please enter valid inductor dimensions.
RESULTS
Inductance
Output Unit

Input Parameters Specification

Coil Type Select single layer, multilayer, or flat planar spiral inductor geometry for correct coil inductance calculation.
Planar Spiral Shape Square, hexagonal, octagonal, and circular spiral layouts use shape-specific constants for RF PCB inductors.
Dimensions Diameter, length, width, spacing, inner diameter and outer diameter define winding area and magnetic coupling.
Turns Turn count controls flux linkage and strongly affects air core coil, multilayer coil, and planar spiral inductance values.

Practical Operational Examples

Flat Spiral Verification

Shape: Square
dout: 250 µm
w: 10 µm
s: 2 µm
n: 5

Expected Square Result

Inner Diameter: 134.00 µm
Fill Factor: 0.3021
Modified Wheeler: 7.710 nH
Current Sheet: 7.625 nH
Monomial Fit: 7.517 nH

Diagrams & Theory

Single and multilayer coils are useful for air-core RF inductors, while flat planar spirals are used in PCB inductors, RF filters, oscillators, impedance matching and compact electronic layouts.

MULTI COIL Depth Length Radius SINGLE COIL Radius Length

Formulas & Mathematical Logic

Single Layer: Self-Inductance = r² × N² / (9r + 10l)
Flat Spiral: din = dout - 2 × (n × (w + s) - s)
Modified Wheeler, Current Sheet and Monomial Fit use shape-specific constants for square, hexagonal, octagonal and circular spiral coils.

This calculator preserves the original single and multilayer coil logic, and flat mode uses planar spiral formulas based on outer diameter, turn width, spacing and turns. Formula source reference was supplied in your uploaded code. :contentReference[oaicite:0]{index=0}

Related Tools

About this tool

Inductor Design Tool is a free online calculator tool. Use it to get instant, accurate results for your electronics calculations.