Preferred RC Filter Designer

Find practical E12, E24, or E96 resistor and capacitor pairs for a target RC filter cutoff.

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Fast electronics calculations help validate a circuit idea before breadboarding.

The tool calculates key parameters locally in the browser and produces a clear report.

For production design, also consider component tolerance, temperature, and the load model.

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Accepted Formats & Rules

✓ Runs locally in the browser without sending data to a server.

✓ Shows practical circuit parameters, not just a formula.

✓ Useful for breadboarding, repair, and learning.

• Do you need to design an RC filter using standard (E-series) resistor and capacitor values?
• Are you looking for closest standard components to match your target cutoff frequency?
• Need to analyze the frequency response of a practical RC filter?