Calculators
Series and Parallel Inductor Calculator
Calculate equivalent inductance for ideal uncoupled inductors connected entirely in series or entirely in parallel, privately in your browser.
Enter 1–1000 positive inductances in one unit, separated by commas, semicolons, spaces, or newlines. Use values from 1e-12 to 1e12. Changing the unit reinterprets the numbers.
Assumes ideal inductors with no mutual magnetic coupling. Coupled coils and transformer windings require a different model.
Combine inductances in an uncoupled series or parallel group.
For ideal inductors with no mutual magnetic coupling, series inductance is L = L₁ + L₂ + … + Lₙ. Parallel inductance follows 1/L = 1/L₁ + 1/L₂ + … + 1/Lₙ. For 10, 20, and 30 mH, the series total is 60 mH and the parallel total is approximately 5.45454545455 mH. Series inductance is at least the largest input; parallel inductance is at most the smallest. A single inductor returns its own value. Enter 1 to 1000 positive values from 1e-12 to 1e12 in one selected unit (H, mH, µH, or nH). Separate values with commas, semicolons, spaces, or newlines; scientific notation is supported. Changing the unit reinterprets the numbers rather than converting them. This model excludes magnetic coupling, winding resistance, core saturation, tolerances, parasitic capacitance, and mixed networks. Do not use it for transformer windings or coupled coils. Results display up to 12 significant digits and stay in your browser.
Frequently Asked Questions
Everything you need to know about this tool, how it works, and privacy.
How do series and parallel inductances differ?
For uncoupled inductors, series values add directly and parallel inductance is the reciprocal of the sum of reciprocals. For 10, 20, and 30 mH, the results are 60 mH in series and approximately 5.45454545455 mH in parallel.
Can I use this for coupled coils?
No. Mutual inductance changes the result depending on coupling strength and winding orientation. This calculator assumes zero magnetic coupling and excludes transformer windings, winding resistance, saturation, and parasitic effects.
Can I mix units?
Convert all values to the same unit first, then choose H, mH, µH, or nH. Changing the selected unit reinterprets your numbers; it does not convert them.
Which inputs are supported?
Enter 1 to 1000 positive values from 1e-12 to 1e12 in the selected unit. Separate them with commas, semicolons, spaces, or newlines. Scientific notation is supported. Zero values and mixed networks are excluded. Results display up to 12 significant digits locally in your browser.