Capacitor Impedance Calculator Formula
Understand the math behind the capacitor impedance calculator. Each variable explained with a worked example.
Formulas Used
Capacitive Reactance (Xc)
reactance = 1 / (2 * pi * frequency_hz * cap_f)Variables
| Variable | Description | Default |
|---|---|---|
capacitance_uf | Capacitance(µF) | 10 |
frequency_hz | Frequency(Hz) | 1000 |
cap_f | Derived value= capacitance_uf / 1000000 | calculated |
How It Works
Capacitive Reactance
Xc = 1 / (2 x pi x f x C)
Reactance decreases with frequency: capacitors pass high frequencies and block low frequencies (DC).
Worked Example
10 uF capacitor at 1 kHz.
capacitance_uf = 10frequency_hz = 1000
- 01C = 10 uF = 0.00001 F
- 02Xc = 1 / (2 x pi x 1000 x 0.00001)
- 03Xc = 1 / 0.06283 = 15.92 ohms
Ready to run the numbers?
Open Capacitor Impedance Calculator