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Inductance Calculator

Inductance and stored energy from V = L·dI/dt.

Introduction

Inductance Calculator — Inductance and stored energy from V = L·dI/dt. Enter Voltage (V), dI/dt (A/s), Current (A) to get an instant, accurate result.

Formula

Inductance is calculated from the induced voltage equation, L = V / (dI/dt), where V is the induced voltage and dI/dt is the rate of change of current. The energy stored in the inductor is then E = ½ × L × I².

Step-by-step

  1. Enter the Voltage (V).
  2. Enter the dI/dt (A/s).
  3. Enter the Current (A).
  4. Click Calculate to see your result instantly.

Real-world example

Example: With Voltage (V) = 12, dI/dt (A/s) = 4, Current (A) = 2, the Inductance Calculator gives Inductance H: 3, Energy J: 6.

Frequently Asked Questions

What does inductance measure?
Inductance measures a component's ability to oppose changes in current by inducing a voltage, measured in henrys (H), based on Faraday's law of electromagnetic induction.
What units does this calculator use?
Enter voltage in volts (V), current change rate in amperes per second (A/s), and current in amperes (A) to get inductance in henrys (H) and stored energy in joules (J).
Where is inductance used in practice?
Inductors are used in transformers, chokes, and filters to store energy in a magnetic field and to resist rapid changes in current, which is useful in power supplies and signal processing circuits.
What inputs does the Inductance Calculator need?
You'll need to provide: Voltage (V), dI/dt (A/s), Current (A). All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.
How accurate is the Inductance Calculator?
The Inductance Calculator applies the formula exactly as calculated — Inductance is calculated from the induced voltage equation, L = V / (dI/dt), where V is the induced voltage and dI/dt is the rate of change of current. The energy stored in the inductor is then E = ½ × L × I². — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.
Is the Inductance Calculator free to use?
Yes, the Inductance Calculator is completely free, requires no signup, and runs instantly in your browser.

About the Inductance Calculator

The Inductance Calculator uses a real, verifiable formula — Inductance is calculated from the induced voltage equation, L = V / (dI/dt), where V is the induced voltage and dI/dt is the rate of change of current. The energy stored in the inductor is then E = ½ × L × I². — so results are accurate every time, not an approximation.