High Pass Filter Calculator
Design a high-pass filter and calculate its response at any frequency.
About High Pass Filter Calculator
A high-pass filter blocks DC and low frequencies while passing high ones. Because a capacitor blocks DC completely, high-pass sections are also used as coupling capacitors between amplifier stages. The same RC pair forms a low-pass or high-pass filter depending only on where the output is taken, which is worth remembering when reading schematics.
Formula
High Pass Filter
Gain = (f/f_c) ÷ √(1 + (f/f_c)²) per order
- high pass
- Passes frequencies above cutoff, blocks DC entirely
Worked example
With the default values below, High Pass Filter Calculator returns Cutoff Frequency of 994.718. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Resistanceminimum 0.01 ohm
- 1,600 ohm
- Capacitanceminimum 0 F
- 0 F
- Signal frequencyminimum 0.01 Hz
- 200 Hz
- Filter orderaccepts 1–8
- 1
Results
- Cutoff Frequency
- 994.718 Hz
- Gain at the Signal Frequency
- -14.106 dB
- Output as a Fraction of Input
- 0.19712
- Phase Shift
- 78.63 degrees
- Attenuation One Decade Below Cutoff
- 20.00 dB
Step by step
- 1Values used
- 2High Pass Filter
- 3Cutoff Frequency= 994.718 Hz
- 4Gain at the Signal Frequency= -14.106 dB
- 5Output as a Fraction of Input= 0.19712
- 6Phase Shift= 78.63 degrees
- 7Attenuation One Decade Below Cutoff= 20.00 dB
Assumptions and limits
- The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax or fees or charges into account.
- Figures are rounded for display to 5 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is High Pass Filter calculated?
Gain = (f/f_c) ÷ √(1 + (f/f_c)²) per order A high-pass filter blocks DC and low frequencies while passing high ones. Because a capacitor blocks DC completely, high-pass sections are also used as coupling capacitors between amplifier stages.
Why does High Pass Filter matter?
The same RC pair forms a low-pass or high-pass filter depending only on where the output is taken, which is worth remembering when reading schematics.
What values do I need to enter?
This calculator takes 4 inputs: Resistance, Capacitance, Signal frequency, Filter order. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.