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Electrical

RC Low Pass Filter Response Calculator

Find the ideal first-order low-pass gain and phase at a chosen frequency.

Ideal component relationshipsUnits and assumptions explained below
Circuit workbench
Circuit workbench

Keep RMS, peak and DC values distinct.

See the method

Enter circuit values

Runs on your device

Your circuit result

Your result

Let’s calculate.

Use the Calculate button to see your result.

Review the method below for assumptions and conventions.

How to use this tool

  1. Enter resistance, capacitance, signal frequency.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

The method, explained

Let x=2πfRC. Magnitude = 1/sqrt(1+x²), gain = −10log10(1+x²), phase = −atan(x).

A WORKED EXAMPLE

Using resistance = 1000 Ω, capacitance = 100 nF, signal frequency = 1000 Hz, the result is -1.44507012 dB. Change these example inputs to match your task; use the method above to check each step.

Understanding your result

Ideal unloaded RC output across the capacitor. Source and load impedances can change the response.

What to keep in mind

Ideal unloaded RC output across the capacitor. Source and load impedances can change the response. Ideal-component calculation for study and estimation. It does not select safe wiring, protective devices or component ratings for an installation.

Common questions

How do I use this rc low pass filter response calculator?

Find the ideal first-order low-pass gain and phase at a chosen frequency. Enter resistance in Ω, capacitance in nF, signal frequency in Hz. The starting example is editable; use values for the same system or project.

Which assumptions affect this result?

Ideal unloaded RC output across the capacitor. Source and load impedances can change the response.

Methodology maintained by ClarityKit. How these tools are built and checked.