Air Core Coil Inductance Calculator
This calculator determines the inductance of an air core flat spiral coil based on its number of turns, inner and outer diameters. It’s commonly used in radio-frequency and PCB applications where coreless coils are required. It supports both imperial and metric units.
Flat Spiral Coil Inductance Tool
Air Core Flat Spiral Inductance Formula
Where:
- $$L$$ = Inductance
- $$N$$ = Number of turns
- $$d_1$$ = Inner diameter
- $$d_2$$ = Outer diameter
- dimension = Multiplier (1 for mm, 0.03937 for inches)
This formula estimates the inductance (in µH) for flat spiral air core coils. The result is approximate and best for RF applications.
Air core flat spiral coils are often used in high-frequency applications due to their low loss and simple construction. This calculator helps you estimate the inductance of such coils based on geometric parameters. The formula considers the effect of turns, and both inner and outer diameters. Use this to quickly design or verify coils in RF circuits, sensors, or custom PCBs.