Farad to Microfarad
Convert Farads to Microfarads instantly for datasheets, meter readings and practical electronics work.
Last updated: May 2026
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Why farads and microfarads both appear in electronics
Practical capacitors for filtering, bypassing and coupling are measured in microfarads, a 1 farad capacitor would be physically enormous. But simulation tools like SPICE require capacitance in farads, and datasheets sometimes mix scales across tables. The conversion comes up when entering µF values into formulas or software that expects F.
The formula is microfarads = farads × 1,000,000. A 100 µF electrolytic is 0.0001 F. The RC time constant τ = RC requires C in farads, a 100 µF cap with a 1 kΩ resistor gives τ = 1000 × 0.0001 = 0.1 seconds.
When you need this conversion
- Converting simulation input: SPICE and LTspice require capacitance in farads
- RC time constant and filter cutoff: both formulas need C in farads to give seconds and Hz
- Comparing supercapacitor specs (in F) against conventional capacitors (in µF)
Quick reference
| Farads | Microfarads |
|---|---|
| 0.000001 F | 1 µF |
| 0.0001 F | 100 µF |
| 0.001 F | 1000 µF (1 mF) |
| 0.01 F | 10000 µF |
| 1 F | 1,000,000 µF (supercapacitor) |
Capacitance prefix ladder
Capacitor values stretch across twelve decades, from a few picofarads up to whole farads. The ladder below walks each common prefix with one real part you would actually find in a circuit, and shows the same value written out in farads so you can see how many zeros separate the scales.
| Prefix value | In farads | Real example part |
|---|---|---|
| 22 pF | 0.000000000022 F | Crystal load capacitor on a microcontroller oscillator |
| 100 nF (0.1 µF) | 0.0000001 F | Decoupling / bypass capacitor next to an IC power pin |
| 470 µF | 0.00047 F | Bulk electrolytic capacitor on a power rail |
| 1 F | 1 F | Supercapacitor for memory backup or energy storage |
Related tools
Reading three-digit capacitor codes
Most ceramic capacitors print a three-digit code on the body instead of the full value. The first two digits are significant figures; the third is the multiplier (number of zeros added), giving picofarads. Divide by 1,000,000 to reach microfarads. A "104" cap is therefore 10 x 10,000 pF = 100,000 pF = 0.1 µF, the ubiquitous bypass capacitor on IC power pins.
| Code | Value in pF | Value in nF | Value in µF | Common use |
|---|---|---|---|---|
| 100 | 10 pF | 0.01 nF | 0.00001 | Crystal load capacitor |
| 103 | 10,000 pF | 10 nF | 0.01 | RC filter, snubber |
| 104 | 100,000 pF | 100 nF | 0.1 | Bypass / decoupling |
| 105 | 1,000,000 pF | 1000 nF | 1 | Bulk decoupling |
| 472 | 4,700 pF | 4.7 nF | 0.0047 | RF filter |
| 221 | 220 pF | 0.22 nF | 0.00022 | Oscillator trimmer range |
Electrolytic capacitors (cylindrical, usually blue or black) print the value directly in µF along with the voltage rating: "470 µF 16V" means 470 microfarads, maximum 16 volts. No code to decode, but polarity must be observed.
Frequently Asked Questions
Why are most capacitors rated in microfarads rather than farads?
A 1 farad capacitor is physically enormous and expensive. Practical filter, bypass and coupling capacitors range from 1 µF to a few hundred µF. Supercapacitors are the main exception where labels show whole farads, they are purpose-built for energy storage, not signal filtering.
What is a typical bypass capacitor value in microfarads?
0.1 µF (100 nF) is the standard bypass capacitor placed next to every IC power pin to suppress switching noise. Bulk capacitors on power rails are commonly 10-470 µF. Audio coupling capacitors range from 1-100 µF depending on the circuit's impedance and the lowest frequency it must pass.
Do I need to worry about unit scale when ordering capacitors?
Yes. Capacitor values span 12 decades from picofarads (pF) to farads (F). Ordering 10 µF when you need 10 nF is a factor-of-1000 error that will not be obvious until the circuit misbehaves. Always confirm the prefix, F, mF, µF, nF, pF, before placing an order or fitting a replacement part.
How do I read the code "104" printed on a ceramic capacitor?
Take the first two digits (10) and add the number of zeros given by the third digit (4), giving 100,000. The result is in picofarads: 100,000 pF. Convert up by dividing by 1,000 to get nanofarads (100 nF), then divide again by 1,000 to get microfarads (0.1 µF). The "104" cap is therefore 0.1 µF, the standard ceramic bypass capacitor placed next to every IC power pin. A "472" code reads as 47 followed by two zeros: 4,700 pF = 4.7 nF.
What happens if I fit an electrolytic capacitor backwards?
Reversed polarity forces current through an electrolytic capacitor in the wrong direction. The electrolyte breaks down, internal gas builds up, and the cap can bulge, leak or rupture. Some electrolytics have a pressure vent on the top that opens to release gas safely; others simply fail destructively. At low voltages the failure may be gradual (just high leakage current and reduced capacitance), but at higher voltages the failure can be immediate and audible. Always confirm the negative stripe and shorter lead go to the negative rail before powering the circuit.