Inductance Calculator

Estimate inductance from voltage and a change in current over time. Enter your own values below to see inductance and check the method behind it.

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Your inputs

Change the example values to match your situation.

Your result

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Fill in your inputs and select Calculate.
Your result and breakdown will appear here.

How this calculator works

Inductance magnitude = induced voltage × time ÷ current change.

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What is Inductance Calculator?

Inductance Calculator helps you estimate inductance from voltage and a change in current over time.

The main result is inductance. The formula, example and assumptions below explain how to interpret it.

How to use Inductance Calculator

Use the example to get familiar with the form, then enter your own figures. Any rates in the example are illustrative. Check the field labels and units before calculating.

  1. Gather induced voltage magnitude (V), current change (A) and time for current change (seconds). Use values from the same situation or reporting period.
  2. Replace the example induced voltage magnitude with your own value, then complete the other fields. Check the displayed units.
  3. Select Calculate and read inductance. Change one input and calculate again to compare a second scenario. Reset restores the original example.
  • Enter induced voltage magnitude in V, at least 0. Decimals are accepted.
  • Enter current change in A, at least 0.000001. Decimals are accepted.
  • Enter time for current change in seconds, at least 1e-9. Decimals are accepted.

Inductance Calculator: a worked example

With the inputs below, the result is 60 mH (inductance). Follow the example, then replace these illustrative values with your own.

Example inputs and output
Input or outputExample value
Induced voltage magnitude (V)12 V
Current change (A)2 A
Time for current change (seconds)0.01 seconds
Inductance60 mH

Understanding the Inductance result

The main output is inductance, expressed in mH. It applies to the inputs and operation you selected.

Displayed results use a readable number of decimal places. When checking a result by hand, keep extra precision until the last step. To compare scenarios, change one input at a time and keep the others fixed.

Inductance Calculator: assumptions and common mistakes

A useful estimate starts with the right inputs. Check the following assumptions and limits before applying the result to your situation.

  • DC, single-phase and three-phase calculations use different relationships. Equipment selection also depends on installation conditions and applicable standards.

For wider guidance, visit Bureau of Indian Standards. The formula and scope of this specific tool are stated on this page.

Inductance Calculator FAQs

What does Inductance Calculator calculate?

Inductance Calculator helps you estimate inductance from voltage and a change in current over time. Its main output is inductance in mH.

What inputs do I need for Inductance Calculator?

You need induced voltage magnitude (V), current change (A) and time for current change (seconds). Use the field labels and units to match your figures to the formula.

Which formula does Inductance Calculator use?

Inductance magnitude = induced voltage × time ÷ current change.

What is a worked example for Inductance Calculator?

Example inputs: Induced voltage magnitude: 12 V; Current change: 2 A; Time for current change: 0.01 seconds. The result is 60 mH (inductance).

How should I enter induced voltage magnitude?

Enter induced voltage magnitude in V, at least 0. Decimals are accepted.

How do I choose current change?

Enter current change in A, at least 0.000001. Decimals are accepted. The example uses 2 A; replace it if your circumstances differ.

How should I read inductance?

The main output is inductance, expressed in mH. It applies to the inputs and operation you selected.

Why might my Inductance Calculator result differ from my records?

DC, single-phase and three-phase calculations use different relationships. Equipment selection also depends on installation conditions and applicable standards. Differences in entered values, units or rounding can also change the comparison.

Can I compare two scenarios in Inductance Calculator?

Yes. Note your first inductance, change induced voltage magnitude or another input, and select Calculate again. Editing a field clears the old result so it is not mistaken for a new calculation.

Is Inductance Calculator free, and where are my inputs calculated?

This calculator is free to use without signing in. Its formula runs in your browser; calculator inputs are not sent to a calculation API. The inputs reset to the example values when you reset the form or start a fresh page.