Capacitor Value Calculator
Calculate capacitance, reactance, charge, energy, and decode capacitor color codes.
Note: This calculator is for ceramic capacitors with color bands. Most modern capacitors use printed values.
Color code values are in picofarads (pF)
Result:
Formulas:
Capacitive Reactance: Xc = 1 / (2π × f × C)
Charge: Q = C × V
Energy: E = ½ × C × V²
Series: 1/Ct = 1/C1 + 1/C2 + 1/C3...
Parallel: Ct = C1 + C2 + C3...
Common Capacitor Values:
- • Ceramic: 1pF - 1μF
- • Electrolytic: 1μF - 10,000μF
- • Tantalum: 0.1μF - 1000μF
- • Film: 1nF - 10μF
- • Power Supply Filter: 100μF - 1000μF
- • Decoupling: 0.1μF (100nF)
- • Audio Coupling: 1μF - 100μF
- • Timing: 1nF - 100μF
Example Calculations:
Example 1: 100μF capacitor at 50Hz
Reactance: Xc = 1/(2π × 50 × 0.0001) = 31.83Ω
Example 2: 470μF capacitor charged to 12V
Charge: Q = 470×10⁻⁶ × 12 = 5.64mC | Energy: E = ½ × 470×10⁻⁶ × 12² = 33.84mJ
Example 3: Two 100μF capacitors in series
Total: 1/Ct = 1/100 + 1/100 → Ct = 50μF
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