RL Time Constant Calculator
Find the time constant of an ideal first-order RL circuit as L/R.
Open toolRC Time Constant Calculator
Find the time constant of an ideal first-order RC circuit as RC. Single ideal resistor and capacitor; no charge trajectory or parasitic elements.
Free to useNo sign-upRuns in your browser
Enter your details
Enter the inputs, then select Calculate.
Your result
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Result will appear here
How RC Time Constant Calculator works
Find the time constant of an ideal first-order RC circuit as RC.
Single ideal resistor and capacitor; no charge trajectory or parasitic elements. Inputs and results use floating-point numbers and may be rounded. Results show up to 12 significant digits.
How to use RC Time Constant Calculator
Follow the labelled inputs.
Enter resistance (ω)
Replace the example with resistance (ω). The field labels specify the expected format and units.
Input and settings
Check the remaining inputs
Set capacitance (f). Single ideal resistor and capacitor; no charge trajectory or parasitic elements.
Tool result
Run, review and save
Select Calculate. Review the calculated result, then copy it or download the result text.
Review the details
Examples and uses for RC Time Constant Calculator
Check the supplied example
The starting example produces 0.001 s. Find the time constant of an ideal first-order RC circuit as RC.
Use your own inputs
Read the labels for resistance (ω) and capacitance (f). Single ideal resistor and capacitor; no charge trajectory or parasitic elements.
Record a reviewed result
Copy the calculated result into your notes. Keep the formula and assumptions with it if someone else needs to reproduce the calculation.
How to read the result
Read the units and assumptions with the output.
Find the time constant of an ideal first-order RC circuit as RC.
Single ideal resistor and capacitor; no charge trajectory or parasitic elements. Inputs and results use floating-point numbers and may be rounded. Results show up to 12 significant digits.
Supported input and limits
Check the stated scope before you run it.
Single ideal resistor and capacitor; no charge trajectory or parasitic elements. Inputs and results use floating-point numbers and may be rounded. Results show up to 12 significant digits.
The input stays in this browser. Copy result and Download save the same displayed text.
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Open toolRC Time Constant Calculator: common questions
Answers about using RC Time Constant Calculator and understanding its results.
What inputs and assumptions apply?
Single ideal resistor and capacitor; no charge trajectory or parasitic elements. Inputs and results use floating-point numbers and may be rounded. Results show up to 12 significant digits.
How can I save the result?
Copy result copies the displayed text. Download saves the same text as a TXT file. Processing runs in this browser without an account.
Calculate with your input
Check the calculated result, then copy or download it.