Capacitor Calculator
Online calculators for capacitors and RC circuits
Capacitor Basics
Capacitive Reactance
Reactance XC at given frequency
RC Time Constant
Time constant τ of RC circuit (low-pass)
Capacitor Circuits
Series Connection
Total capacitance of capacitors in series
Two Capacitors in Series
Simplified calculation for two capacitors
RC Circuit Analysis
RC Series Circuit
Voltage, current and power in RC series circuits
RC Parallel Circuit
Voltage, current and power in RC parallel circuits
RC Impedance
R and C values for given impedance
Cutoff Frequency
Calculate cutoff frequency of RC circuits
Filter Design
RC Low-Pass Filter
Design and analysis of RC low-pass filters
RC High-Pass Filter
Design and analysis of RC high-pass filters
RC Integrator
RC integrator circuit analysis and design
RC Differentiator
RC differentiator circuit analysis and design
Charging & Discharging
Capacitor Charging
Charging voltage at a specific time
Capacitor Discharge
Discharge voltage at a specific time
RC for Charging
R or C for specific charging voltage at time
About Capacitor Calculators
This calculator collection covers all important aspects of capacitor technology. From basic calculations to circuit analysis, complex filter designs and charging/discharging processes.
- Basics - Reactance, time constant
- Circuits - Series, parallel connections
- RC Analysis - Impedance, cutoff frequency
- Filters - Low-pass, high-pass
- Functions - Integrator, differentiator
- Dynamics - Charging and discharging
Note: All calculators use SI units and are designed for practical
applications in electronics development and circuit analysis.
Important Formulas
Fundamentals
XC = 1/(2πfC)
τ = R × C
fc = 1/(2πRC)
Charging/Discharging
UC(t) = U0(1-e-t/τ)
UC(t) = U0e-t/τ
Typical Values
Time constant:
τ = 63.2% charge
5τ ≈ fully charged
τ = 63.2% charge
5τ ≈ fully charged
Filter:
fc = -3dB point
Octave: Factor 2
fc = -3dB point
Octave: Factor 2