C

Capacitance Calculator

Capacitors in series or parallel, or the capacitance of a parallel-plate capacitor from its size and dielectric.

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How it's calculated

Parallel: C = C₁ + C₂ + …
Series: 1/C = 1/C₁ + 1/C₂ + …
Plate: C = ε₀ × εr × A ÷ d

Capacitors combine the opposite way to resistors: in parallel they add, in series the total falls below the smallest. A parallel-plate capacitor holds more charge with bigger plates, a thinner gap and a dielectric with higher permittivity between them. ε₀ is the permittivity of free space, 8.854 × 10⁻¹² F/m.

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