Coil & Transformer Calculators: Inductance, Turns and Electromagnetic Force

This collection of coil and transformer calculators helps engineers, electronics hobbyists, and students solve the most common tasks in electromagnetic circuit design. Whether you are winding an air core coil, sizing a transformer, or combining inductors, these tools give you quick, reliable answers without manual formulas.Use the Air Core Coil Inductance and Physical Properties of Coil calculators to design windings from scratch, check Parallel Inductance and Series Inductance for circuit analysis, and estimate pull strength with the Solenoid Coil Electromagnetic Force tool. Transformer work is covered by the Single Phase Transformer and Number of Turns in Transformer Coil calculators, plus specialized tools for straight wire and grounding strap inductance.

Physical Properties of Coil

Enter the number of turns, coil diameter and wire diameter to find the total wire length, cross-sectional area, copper volume and copper mass of a coil. Useful for winding inductors, electromagnets and solenoids.

Solenoid Coil Electromagnetic Force

Estimate the pulling force of a solenoid coil from the number of turns, current, core cross-sectional area, and air gap length. Enter your coil parameters to get the electromagnetic force in newtons.

Number of Turns in Transformer Coil

Calculate the number of turns needed in a transformer winding from the voltage, frequency, core flux density, and core cross-sectional area. Enter values in V, Hz, tesla, and cm² to get the required turn count instantly.

Single Phase Transformer

Calculate secondary voltage, secondary current, and turns ratio for a single-phase transformer. Enter primary voltage, primary and secondary turns, and primary current to get instant results.

Straight Wire Inductance

Estimate the inductance of a straight round wire from its length and diameter. Useful for RF circuits, antenna elements, lead wires, and bus bars where even short conductors add reactance.

Air Core Coil Inductance

Calculate the inductance of a flat spiral air core coil from its inner diameter, outer diameter, and number of turns. Enter the coil dimensions in millimeters and read the result in nanohenries.

Series Inductance

This calculator determines the total inductance of inductors connected in series. Enter the individual inductance values separated by commas (in µH) and get the total inductance instantly.

LC Resonance

Calculate the resonant frequency of an LC (tank) circuit from its inductance and capacitance using the Thomson formula. Enter L and C with their units to get frequency, period, and angular frequency.

Grounding Strap Inductance

Calculate the inductance of a flat grounding strap from its length, width and thickness in millimeters. The result in nH helps you design low-impedance ground connections for EMC and high-frequency circuits.

Parallel Inductance

Calculate the equivalent inductance of inductors connected in parallel. Enter comma-separated inductance values in µH and get the total inductance instantly.