Parallel Capacitance Calculator

Reviewed by the CalculatorHub team, edited by James Graham. Last verified 25 June 2026.

When capacitors are wired in parallel, their total capacitance is simply the sum of the individual values, which makes parallel a convenient way to build up a larger capacitance from smaller standard parts. The reason is physical: connecting capacitors in parallel effectively adds their plate areas, and capacitance is proportional to plate area, so the capacitances add directly. This is the opposite of resistors, where parallel connection reduces the total. This calculator takes up to four capacitor values in microfarads and returns the total parallel capacitance, also in microfarads, to two decimal places. Leave any unused fields at zero and they contribute nothing to the sum. Because the relationship is a plain addition, it scales to any number of capacitors; you simply keep adding values. Parallel combinations are common in power supply decoupling, where several capacitors share the load, and in tuning circuits where a fixed and a variable capacitor combine. The definitions of the farad and the other electrical units are maintained by the National Institute of Standards and Technology. Every figure here is computed deterministically from the standard sum, shown in full below, with a worked example that reconciles exactly to the calculator so you can follow each step yourself and check the arithmetic.