Capacitance Conversion

Why Conversion is Necessary

There is often overlap between these multipliers. For example, a capacitor might be listed as 0.1 $\mu$F on a schematic, but the physical part you buy might be marked as 100 nF. These represent the exact same capacitance value.

• The Rule of 1000: Each unit step is a factor of 1,000.
  • $1 \mu F = 1,000 nF$
  • $1 nF = 1,000 pF$

Note: The usage of Nanofarads (nF) varies by region. In some areas, it is common to skip nF entirely, expressing values only as fractions of a Microfarad (e.g., $0.001 \mu F$) or large multiples of Picofarads.

Understanding Capacitance

Capacitance is the ability of a component or circuit to collect and store energy in the form of an electrical charge.

• Symbol: The symbol for the variable of capacitance is $C$.
• Unit: The SI unit for capacitance is the Farad, denoted by the symbol $F$.

The Formula:

The relationship between capacitance ($C$), charge ($q$), and voltage ($V$) is defined as:

$C = \frac{q}{V}$

Where:

• $C$: Capacitance (Farads)
• $q$: Charge held on the plates (Coulombs)
• $V$: Voltage between the plates (Volts)

Common Units of Measurement

While the standard unit is the Farad (F), a single Farad is an extremely large amount of capacitance. In practical electronics, we almost always use prefixes to denote smaller values:

• Microfarad ($\mu$F): $10^{-6}$ Farads (Common for power supply filtering)
• Nanofarad (nF): $10^{-9}$ Farads (Common for general usage)
• Picofarad (pF): $10^{-12}$ Farads (Common for RF and timing circuits)

Capacitor Value Conversion Chart

Use the table below to quickly convert between the three most common multipliers.