Advanced tools for electronics engineers and hobbyists to calculate and design inductors
Click on each band to select its color. The inductance value will update automatically.
Click on each band to select its color. The inductance value will update automatically.
Enter inductor values to calculate the equivalent inductance in series.
Enter inductor values to calculate the equivalent inductance in parallel.
When inductors are connected in series, the equivalent inductance is calculated by adding the individual inductances:
This means the equivalent inductance is always larger than the largest individual inductor in the series.
When inductors are connected in parallel, the equivalent inductance is calculated using:
This means the equivalent inductance is always smaller than the smallest individual inductor in the parallel connection.
Series connection: In series, the same current flows through each inductor, and the voltage drops add up. The total inductance is the sum of individual inductances because the magnetic fields add constructively.
Parallel connection: In parallel, the voltage across each inductor is the same, but the currents divide. The total inductance is less than any individual inductance because the magnetic fields interact to reduce the overall inductance.
Convert between different inductance units quickly and easily.
Conversion Result:
1 μH = 1,000 nH = 1,000,000 pH
1 μH = 0.001 mH = 0.000001 H
Design air-core inductors by specifying physical parameters.
The inductance of an air-core solenoid is calculated using:
Where:
| Color | 1st Digit | 2nd Digit | Multiplier | Tolerance |
|---|---|---|---|---|
| Black | 0 | 0 | 1μH | - |
| Brown | 1 | 1 | 10μH | ±1% |
| Red | 2 | 2 | 100μH | ±2% |
| Orange | 3 | 3 | 1mH | ±3% |
| Yellow | 4 | 4 | 10mH | ±4% |
| Green | 5 | 5 | 100mH | ±0.5% |
| Blue | 6 | 6 | 1H | ±0.25% |
| Violet | 7 | 7 | 10H | ±0.1% |
| Gray | 8 | 8 | 100H | ±0.05% |
| White | 9 | 9 | 1000H | - |
| Gold | - | - | 0.1μH | ±5% |
| Silver | - | - | 0.01μH | ±10% |
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