RC Lowpass Cutoff Frequency
Use this rc lowpass cutoff frequency tool when you have measured values for ohms, cap uf. It applies a transparent mathematical relationship to those values to return an answer in Hz. Unlike a prediction or recommendation, this is a calculation from your inputs. Ideal first-order RC network; component tolerances apply. Enter a different scenario to see how this particular quantity changes; check the assumptions before using it in a project.
How to use this calculator
- Use exact measurements and consistent units for ohms, cap uf.
- Enter each quantity; blank, nonnumeric and out-of-range inputs are not accepted.
- Compare the reported Hz quantity against your own data and the limitations below.
Formula for RC Lowpass Cutoff Frequency
Hz = 1/(2*π*ohms*cap_uf*0.000001). Inputs are expressed in the units shown by the labels.
- This uses a direct electrical relationship and does not retrieve remote data, forecasts or individual account information.
- Ideal first-order RC network; component tolerances apply.
Worked examples
Worked example — RC Lowpass Cutoff Frequency
Enter Ohms = 10000, Cap uf = 0.1.
Apply 1/(2*π*ohms*cap_uf*0.000001).
Calculated value: approximately 159.1549 Hz.
Understanding the result
The example produces about 159.1549 Hz; this is a mathematical output for the example inputs, not an observed result for your project.
Ideal first-order RC network; component tolerances apply.
Important notes
Ideal first-order RC network; component tolerances apply.
Use values from the same measurement period or physical system. The result is in Hz and is not a guarantee of capacity, safety, ranking or revenue.
Frequently asked questions
What does RC Lowpass Cutoff Frequency calculate?
It converts ohms, cap uf into a quantity measured in Hz using the stated formula.
Which assumption matters most?
Ideal first-order RC network; component tolerances apply.
How can I check this output?
Recalculate the worked example from the input quantities, confirm units and compare with direct measurements where available. This calculator does not fetch live data.
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Related explanations
Learn the method behind the number or compare the terminology before using the calculator.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.