Analyze coil combinations with clean formulas and instant results. Visualize totals, reactance, and stored energy. Export results quickly for testing, documentation, and design review.
| Example | Connection | Inputs | Frequency | Equivalent Inductance | Use Case |
|---|---|---|---|---|---|
| Example A | Series | 10 mH + 22 mH + 4.7 mH | 1 kHz | 36.7 mH | Filter prototyping |
| Example B | Parallel | 10 mH || 22 mH || 4.7 mH | 1 kHz | 2.853 mH | Equivalent branch reduction |
| Example C | Series | 220 µH + 330 µH | 50 kHz | 550 µH | Switching circuit estimate |
L(eq) = L1 + L2 + L3 + ...
Series inductors add directly when mutual coupling is negligible. The total inductance increases, and the same current flows through every component.
1 / L(eq) = 1/L1 + 1/L2 + 1/L3 + ...
Parallel inductors combine like resistors in parallel. The equivalent inductance becomes lower than the smallest branch inductance when branches are uncoupled.
XL = 2πfL
Reactance shows how much an inductor opposes alternating current at a selected frequency. Higher frequency or larger inductance increases reactance.
E = 0.5 × L × I²
Stored magnetic energy depends on equivalent inductance and current. This helps estimate transient behavior and energy capacity in practical designs.
This calculator assumes uncoupled inductors. Strong magnetic coupling changes the result and should be modeled separately.
Use series inductors when you need a larger total inductance and the same current passes through each coil. This is common in filtering, prototyping, and replacement analysis.
Use parallel inductors when you want a lower equivalent inductance or need current sharing across branches. Parallel networks are useful in branch simplification and some power designs.
No. It assumes inductors are uncoupled. If coils are magnetically close or wound on the same core, mutual inductance can change the total value significantly.
Frequency is used to compute inductive reactance. Equivalent inductance itself does not change with frequency in this simplified model, but AC opposition does.
DCR means direct current resistance. It helps estimate conduction loss, branch behavior, and time constant. Lower DCR usually reduces resistive heating.
The tool compares the applied current, adjusted by safety factor, against the lowest entered current rating. It is a quick screening check, not a thermal certification.
Yes. The calculator converts all entries into henries internally, then displays the result in a practical unit automatically.
Time constant is estimated as L/R using the entered load resistance. It helps describe how current changes in a simple RL approximation.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.