If you are looking up a 100 nF capacitor on a capacitance converter, the direct converted answer is 0.1 µF (microfarads) or 100,000 pF (picofarads). The foundational formula used for this step-down conversion is CµF = CnF ÷ 1000. Substituting our exact query values into the formula: 100 ÷ 1000 = 0.1 µF. On physical components, this value is universally stamped with the EIA 3-digit code 104 (10 followed by 4 zeros in picofarads). Pure unit conversions like this are absolute, but if you are using a capacitance converter tool to calculate AC reactance (XC) or reactive power (kVAR) for power factor correction, the answer completely shifts based on your system voltage, frequency, and phase configuration.
Here is a quick reference table for neighboring values within a ±20% range of our 100 nF baseline, which is highly useful when substituting standard E12/E24 series components on the bench:
| Nanofarads (nF) | Microfarads (µF) | Picofarads (pF) | EIA Code |
|---|---|---|---|
| 80 nF | 0.08 µF | 80,000 pF | 803 |
| 90 nF | 0.09 µF | 90,000 pF | 903 |
| 100 nF | 0.1 µF | 100,000 pF | 104 |
| 110 nF | 0.11 µF | 110,000 pF | 114 |
| 120 nF | 0.12 µF | 120,000 pF | 124 |
Standard Capacitor Value Conversion Chart
When reading schematics or sorting through your component bins, jumping between picofarads, nanofarads, and microfarads is a daily necessity. The table below maps standard capacitance values across all three primary units, alongside their 3-digit EIA markings and typical dielectric materials. Keep in mind that dielectric materials heavily influence a capacitor's physical size, temperature stability, and equivalent series resistance (ESR).
| Picofarads (pF) | Nanofarads (nF) | Microfarads (µF) | 3-Digit EIA Code | Common Dielectric / Type |
|---|---|---|---|---|
| 10 pF | 0.01 nF | 0.00001 µF | 100 | NP0/C0G Ceramic (High Freq) |
| 100 pF | 0.1 nF | 0.0001 µF | 101 | NP0/C0G Ceramic |
| 1,000 pF | 1 nF | 0.001 µF | 102 | X7R Ceramic |
| 10,000 pF | 10 nF | 0.01 µF | 103 | X7R Ceramic / Film |
| 100,000 pF | 100 nF | 0.1 µF | 104 | Polyester Film / X7R |
| 1,000,000 pF | 1,000 nF | 1.0 µF | 105 | Tantalum / X5R Ceramic |
| 10,000,000 pF | 10,000 nF | 10.0 µF | 106 | Aluminum Electrolytic |
| 100,000,000 pF | 100,000 nF | 100.0 µF | 107 | Aluminum Electrolytic |
When Capacitance Conversions Require Voltage and Phase Assumptions
Converting Farads to microfarads is simple arithmetic. However, when engineers use a capacitance converter to translate Capacitance (µF) into Reactance (Ohms) or Reactive Power (VARs/kVAR) for AC motor runs and power factor correction banks, the math becomes dependent on the physical circuit environment.
What assumption fixes the answer? When converting capacitance to reactive power, the assumptions that fix the answer are the system frequency (Hz), the applied voltage (V), and the phase configuration. The governing formula for reactive power is Q = V2 × 2πfC. Because frequency and voltage are locked into this equation, a capacitor's "power output" is not an intrinsic property of the component itself.
How the answer shifts for 120V vs 230V vs 3-phase:
Because voltage is squared in the reactive power formula, the shift is exponential, not linear. A standard 50 µF motor run capacitor generates roughly 45 VARs on a 120V/60Hz line. If you move that exact same 50 µF capacitor to a 230V/60Hz line, it generates roughly 165 VARs—nearly 3.6 times the reactive power. In 3-phase industrial systems, the total kVAR shifts drastically based on the wiring topology. If a capacitor bank is wired in Wye (line-to-neutral), it sees reduced voltage. If the exact same microfarad capacitors are rewired in Delta (line-to-line), the bank will yield exactly 3 times the reactive power. Always verify the nameplate wiring diagram before swapping 3-phase capacitor banks.
Converting Farads directly to Amp-hours (Ah) or Watt-hours (Wh) to compare supercapacitors against lithium batteries is meaningless without knowing the operating voltage window and discharge curve. Capacitor energy scales with the square of the voltage (E = ½CV2), meaning a 100F capacitor at 2.7V holds vastly less usable energy than a 100F capacitor at 12V. Similarly, converting a required kVAR back to µF is meaningless if the system frequency (50Hz vs 60Hz) is unknown, as a 60Hz system requires roughly 17% less capacitance to achieve the same VARs as a 50Hz system.
FAQ: Capacitance Converter Edge Cases
Why does my 10µF X5R ceramic capacitor measure as 4µF on the bench?
This is not a faulty capacitance converter or a broken multimeter; it is a phenomenon called DC bias. High-K dielectrics like X5R and X7R suffer from severe voltage coefficients. When you apply a DC voltage (even as low as 5V or 12V) across a small-package ceramic capacitor, the internal dielectric alignment saturates, and the effective capacitance can drop by 50% to 80%. If you need stable capacitance under DC bias, you must upsize the physical package (e.g., moving from 0805 to 1210) or switch to a C0G/NP0 dielectric, which exhibits virtually zero DC bias loss.
Can I substitute a 100nF (104) ceramic with a 0.1µF electrolytic in a high-frequency filter?
No. While the capacitance converter confirms the nominal values are identical, the parasitic elements are completely different. A 0.1µF aluminum electrolytic capacitor has high Equivalent Series Inductance (ESL) and high ESR, making it effectively useless as a high-frequency bypass capacitor. For decoupling ICs on a PCB, always use the ceramic 104 (100nF) capacitor placed as close to the VCC pin as possible.
How do I convert series and parallel capacitance combinations?
Capacitors combine inversely to resistors. For parallel capacitors, simply add the values: Ctotal = C1 + C2. For series capacitors, use the product-over-sum formula for two components: Ctotal = (C1 × C2) ÷ (C1 + C2). Remember that placing capacitors in series reduces the total capacitance but increases the overall voltage rating, which is a common trick in high-voltage power supply design.
