Technology
Inductive reactance
Calculate inductive reactance using frequency and inductance in millihenries; it rises with frequency and becomes zero at direct current.
Calculators / Technology / Capacitive reactance
Capacitive reactance calculator
Find the magnitude of capacitive reactance at a sinusoidal frequency; increasing frequency or capacitance lowers the opposition to alternating current.
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Reactance magnitude31.83Ω
Calculator controls
How to calculate
Find the magnitude of capacitive reactance at a sinusoidal frequency; increasing frequency or capacitance lowers the opposition to alternating current.
Reactance magnitude = 1/(2*pi*f*c/1000000) Ω
Worked example
Frequency (Hz): 50; Capacitance (µF): 100.
Reactance magnitude: 31.83 Ω.
Assumptions and limits
Find the magnitude of capacitive reactance at a sinusoidal frequency; increasing frequency or capacitance lowers the opposition to alternating current. Ideal components without parasitic effects or losses. Reactance is a magnitude for sinusoidal AC. The RC cutoff assumes an unloaded first-order low-pass filter.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Find the magnitude of capacitive reactance at a sinusoidal frequency; increasing frequency or capacitance lowers the opposition to alternating current.
When this tool is useful
Reactance magnitude = 1/(2*pi*f*c/1000000) Ω
Understanding your inputs
| Input | What to enter |
|---|---|
| Frequency (Hz) | Enter a number of at least 1e-12 and no more than 1000000000000. |
| Capacitance (µF) | Enter a number of at least 1e-12 and no more than 1000000000000. |
Frequently asked questions
What assumptions does this calculation use?
Find the magnitude of capacitive reactance at a sinusoidal frequency; increasing frequency or capacitance lowers the opposition to alternating current. Ideal components without parasitic effects or losses. Reactance is a magnitude for sinusoidal AC. The RC cutoff assumes an unloaded first-order low-pass filter.
How is the result calculated?
Reactance magnitude = 1/(2*pi*f*c/1000000) Ω