Top 10 Best Coil Selection Software of 2026

Coil64 is a free, cross-platform software application specialized in precise calculations for designing and selecting inductors, coils, solenoids, toroids, transformers, and related components. It supports a wide array of geometries including single-layer and multi-layer air-core coils, planar spirals, ferrite-core chokes, and LC filters, using established electromagnetic formulas for accuracy. Available for Windows, Linux, macOS, and Android, it enables quick parameter optimization based on inductance, frequency, wire size, and dimensions in both SI and imperial units.

REDEXPERT is a free web-based coil selection tool from Würth Elektronik designed for engineers to find optimal inductors and coils from their extensive portfolio. Users input key parameters like inductance, DC current, ripple current, frequency, voltage, size limits, and temperature rise requirements, receiving tailored recommendations with performance data. It includes simulation capabilities, 3D models, EMI filters, and direct exports to CAD tools for seamless design integration.

FEMM (Finite Element Method Magnetics) is a free, open-source finite element analysis software specialized in 2D planar and axisymmetric electromagnetic simulations, including magnetostatics, electrostatics, heat flow, and current flow problems. For coil selection, it enables detailed modeling of coil geometries within devices like motors and transformers, calculating parameters such as inductance, winding resistance, flux density, and forces. While powerful for performance prediction and optimization, it requires users to build custom models rather than offering a simple parametric selector.

SpeciMEN is a specialized coil selection software from Sagami Elec Co., Ltd., enabling engineers to search and select inductors, chokes, and transformers from their product lineup based on key parameters like inductance, current rating, frequency, and size constraints. It provides detailed specifications, characteristic graphs, 3D models, and exportable data for CAD integration. The tool is particularly geared toward power electronics applications, offering reliable Japanese-manufactured components with simulation-ready info.

JMAG-Express Online is a free web-based magnetic design tool from JSOL Corporation, specialized for rapid prototyping and optimization of coils, inductors, transformers, and small motors. It leverages 2D finite element analysis (FEA) to simulate magnetic fields, inductance, losses, and thermal performance based on user-defined core shapes, materials, and winding configurations. Users can perform parametric studies to select optimal coil designs efficiently without needing desktop software installation.

RadiantZ is a coil selection software tailored for HVAC engineers and manufacturers, enabling precise selection of air-cooled and water-cooled coils based on parameters like airflow, temperature differentials, and pressure drops. It features a vast database of over 10,000 coil configurations from major manufacturers, providing performance calculations, CAD drawings, and quote generation. The tool emphasizes accuracy in heat transfer predictions using ASHRAE-compliant algorithms, streamlining the design process from specification to procurement.

The Coilcraft Inductor Toolset is a free web-based suite of tools from Coilcraft, focused on selecting, modeling, and simulating their inductor products for power, RF, and EMI applications. Key features include parametric search, application-specific finders like the Power Inductor Finder and RF Inductor Wizard, and tools for generating SPICE models, 3D STEP files, and electrical performance graphs. It enables engineers to quickly filter vast catalogs by specs such as inductance, current rating, size, and frequency response, streamlining component selection directly from the manufacturer's data.

SimSurfing is Murata's free web-based simulation tool for passive components, including a vast library of coils and inductors, allowing users to search, visualize characteristics like impedance and Q-factor, and perform basic RF simulations. It provides S-parameters, SPICE models, and equivalent circuit data based on real measured performance across frequencies. Ideal for coil selection in high-frequency applications, it supports quick prototyping without software installation.

QuickField is a finite element analysis (FEA) software focused on electromagnetic, thermal, and structural simulations, enabling detailed modeling of coils, solenoids, inductors, and transformers. It calculates parameters like inductance, magnetic fields, forces, and losses for custom designs through 2D and axisymmetric simulations. While powerful for advanced electromagnetic analysis, it is not a dedicated catalog-based tool for quick off-the-shelf coil selection.

ELMER is a free, open-source multiphysics finite element simulation software that supports electromagnetic modeling, including coil simulations for inductance, magnetic fields, and eddy currents. While not designed as a dedicated coil selection tool with catalogs or quick selectors, it enables detailed custom coil analysis and optimization through FEM simulations. It excels in research-grade predictions but requires significant setup for practical coil design tasks.