RL time constant calculator

Calculate time constant with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use time constant to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Inductance (mH)
100
Resistance (Ω)
10
Time constant (s)
0.01

Try another scenario

Inductance (mH)
110.00000000000001
Resistance (Ω)
10
Time constant (s)
0.011
Calculation method

Calculation method

Time constant (s)

a ÷ 1000 ÷ b

Symbols and units
a
Inductance (mH)
b
Resistance (Ω)

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • Ideal first-order RL circuit; the time constant is L/R.
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Further reading

Method reference ↗

Background reading; this does not imply endorsement or independent review of SumFizz.

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