RC Filter Calculator
Use f = 1/(2πRC) with resistance and capacitance unit conversion.
A QUICK WALKTHROUGH
How to use this tool
- Choose low-pass or high-pass mode.
- Enter positive resistance and capacitance values.
- Review the cutoff frequency; this tool gives no component or safety advice.
Ideal first-order formula
Both passive low-pass and high-pass RC filters use f = 1/(2πRC) for the cutoff frequency. Values are converted to ohms and farads before calculation.
Calculation-only scope
This tool does not provide component voltage ratings, safety guidance, circuit simulation, or design recommendations.
GOOD TO KNOW
Common questions
Is this a passive filter?
Yes. It calculates the ideal first-order passive RC cutoff frequency.
Does low-pass change the formula?
No. Low-pass and high-pass use the same cutoff-frequency formula; the mode labels the filter type.