Capacitance Converter
ScienceConvert capacitance units: farads, microfarads, nanofarads, and picofarads. Essential for circuit design, electronics hobbyists, and electrical engineers.
From
To
All conversionsfor 1 Microfarad (μF)
| Farad (F) | 0.000001 |
| Millifarad (mF) | 0.001 |
| Microfarad (μF) | 1 |
| Nanofarad (nF) | 1000 |
| Picofarad (pF) | 1000000 |
| Abfarad (abF) | 1.0000e-15 |
What is a Capacitance?
A Capacitance Converter converts between units that measure a capacitor's ability to store electric charge. Capacitance quantifies how much charge a component accumulates per unit of applied voltage — it is the "storage tank" property of capacitors in electronic circuits.
The SI unit is the farad (F), defined as one coulomb per volt (C = Q/V). A one-farad capacitor is enormous by component standards — the size of a large tin can at best, and commercially available only as supercapacitors. This is why the farad's subdivisions are the practical everyday units:
| Unit | Value | Common use |
|---|---|---|
| Millifarad (mF) | 10⁻³ F | Large supercapacitors |
| Microfarad (μF) | 10⁻⁶ F | Power supply filtering, electrolytic capacitors |
| Nanofarad (nF) | 10⁻⁹ F | Ceramic bypass, decoupling capacitors |
| Picofarad (pF) | 10⁻¹² F | RF circuits, crystal oscillators, stray capacitance |
For Indian electronics students, hobbyists, and engineers, capacitance conversion is a routine task when translating component values between different notations. A schematic may show "0.1 μF" while a parts catalogue shows "100 nF" — both are the same value. This converter makes that equivalence immediately visible.
The capacitance-voltage-charge relationship (Q = C × V) connects this converter directly to the Electric Charge Converter. For RC circuit timing calculations (τ = RC), also see the Electric Resistance Converter.
How to use this Capacitance calculator
- The converter loads with Microfarad (μF) as the FROM unit and Nanofarad (nF) as the TO unit — the most common conversion for working between component notation and schematic values.
- Select your source unit from the FROM dropdown: F, mF, μF, nF, pF, or abF.
- Enter the capacitance value in the input field. Results update immediately as you type.
- Select your target unit from the TO dropdown.
- Use the ⇅ swap button to reverse the conversion — useful when converting nF values back to μF for a power supply calculation.
- Scroll to the reference table to see your capacitance in all 6 units simultaneously — particularly useful for confirming that different component labels represent the same value.
- For timing circuit design, use the converted farad value in the RC time constant formula: τ = R (in ohms) × C (in farads).
Formula & Methodology
This is a linear converter using the farad (F) as the common base unit. All conversions follow:Result = Input × (toBase_from ÷ toBase_to)Key toBase values (farads): | Unit | Farads | |---|---| | Farad (F) | 1 | | Millifarad (mF) | 1 × 10⁻³ | | Microfarad (μF) | 1 × 10⁻⁶ | | Nanofarad (nF) | 1 × 10⁻⁹ | | Picofarad (pF) | 1 × 10⁻¹² | | Abfarad (abF) | 1 × 10⁹ | All prefix multipliers are exact per SI definitions. The abfarad is the CGS electromagnetic unit equal to 10⁹ farads. Worked example — RC timer in Pune: Design a 555 timer astable circuit with a 1-second period (1 Hz). Using a 10 kΩ resistor (approximately), what capacitance is needed?τ = R × C → C = τ ÷ R C = 1 ÷ 10,000 = 0.0001 F = 100 μFIn practice, use a 100 μF electrolytic capacitor. In nanofarads: 100 μF = 100,000 nF. In picofarads: 100 μF = 100,000,000 pF = 10⁸ pF. Common RC time constant reference: | R | C | τ (= R × C) | Use case | |---|---|---|---| | 1 kΩ | 100 nF | 0.1 ms | Audio filter | | 10 kΩ | 10 μF | 0.1 s | Switch debounce | | 10 kΩ | 100 μF | 1 s | 555 timer 1 Hz | | 1 MΩ | 1 μF | 1 s | Long-delay timer | Energy stored in a capacitor: E = ½ × C × V² (joules). A 1000 μF capacitor at 12V stores ½ × 0.001 × 144 = 0.072 J = 72 mJ.
Frequently Asked Questions
What is capacitance and what does it measure?
Capacitance is the ability of a component or system to store electric charge for a given electric potential. The SI unit is the farad (F), named after Michael Faraday. One farad is defined as the capacitance of a capacitor that stores one coulomb of charge when one volt is applied across it (C = Q/V). In practice, one farad is an enormous amount of capacitance — most electronic components use microfarads (μF), nanofarads (nF), or picofarads (pF).
What is the difference between μF, nF, and pF?
These are SI prefix variants of the farad: 1 μF (microfarad) = 1,000 nF (nanofarad) = 1,000,000 pF (picofarad). Electrolytic capacitors used in power supply filters are typically 10–10,000 μF; ceramic capacitors in decoupling and bypass applications are typically 10 nF to 100 nF (= 0.01–0.1 μF); RF resonant circuits and crystal oscillator circuits use capacitors in the 10–100 pF range; and stray capacitance on PCB traces is in the single-digit pF range.
What capacitors are commonly used in Indian electronics projects?
The most common capacitor values in Indian hobbyist and student projects are: 100 nF (0.1 μF) ceramic for bypass decoupling on 5V and 3.3V power rails in Arduino and Raspberry Pi circuits; 10–100 μF electrolytic for power supply ripple filtering; 22 pF and 33 pF ceramic for crystal oscillator matching capacitors in microcontroller circuits; and 1000 μF electrolytic for audio amplifier power supply banks. All of these values are available in Indian electronics markets from Lamington Road (Mumbai) and Nehru Place (Delhi) retailers.
How do I convert microfarads to nanofarads?
To convert microfarads (μF) to nanofarads (nF), multiply by 1000. For example, 0.1 μF = 100 nF. To convert nanofarads to picofarads, multiply by 1000: 100 nF = 100,000 pF. To convert nanofarads to microfarads, divide by 1000: 470 nF = 0.47 μF. This converter handles all these conversions instantly — select the source unit in FROM, enter the value, select the target in TO.
What does a 100 nF capacitor do in a circuit?
A 100 nF (0.1 μF) ceramic capacitor is most commonly used as a bypass or decoupling capacitor placed between the power supply and ground pins of integrated circuits. It suppresses high-frequency noise and voltage spikes on the power rail by providing a local reservoir of charge that can respond faster than the main power supply. This is why virtually every microcontroller, logic chip, and amplifier IC in a PCB has a 100 nF ceramic capacitor placed as close as possible to its VCC and GND pins.
What is a supercapacitor and how does its capacitance compare?
Supercapacitors (also called ultracapacitors or electrochemical double-layer capacitors) have capacitances measured in farads — typically 1F to 3000F. This is 1 million to 3 billion times larger than a typical electrolytic capacitor. Supercapacitors are used for energy buffering in industrial UPS systems, regenerative braking in trains and EVs, and backup power for memory retention. In India, railway applications in the Delhi Metro and Vande Bharat trains use supercapacitors for energy recovery. A 100F supercapacitor at 2.7V stores 100 × 2.7²/2 = 364.5 joules.
What is an abfarad and when is it used?
The abfarad is a unit of capacitance in the CGS (centimetre-gram-second) electromagnetic system, equal to 10⁹ farads (one billion farads). It is an obsolete unit not used in modern electronics — the SI farad is the universal standard. The abfarad appears only in historical physics texts and conversion tables. One abfarad equals approximately 1,000 large supercapacitors, making it useful primarily as a demonstration of just how enormous one abfarad would be in practice.
How is capacitance related to charge and voltage?
Capacitance (C), charge (Q), and voltage (V) are related by: Q = C × V, or equivalently C = Q/V and V = Q/C. A 100 μF capacitor charged to 12V stores 100 × 10⁻⁶ × 12 = 0.0012 C = 1200 μC of charge. This relationship is fundamental to capacitor circuit analysis: to find how much charge a capacitor holds, multiply its capacitance (in farads) by the voltage across it. Use the Electric Charge Converter for converting between charge units.
How do I use the Capacitance Converter?
Select your source unit from the FROM dropdown — for example, Microfarad (μF). Enter the capacitance value in the input field. Select your target unit from the TO dropdown — for example, Nanofarad (nF). The result appears immediately. Use the ⇅ swap button to reverse the conversion, and scroll to the reference table to see the capacitance in all available units simultaneously.
What capacitance is needed for power supply filtering?
Power supply filter capacitor sizing depends on load current and acceptable ripple voltage. A rough rule of thumb is 1000 μF per ampere of output current at 50 Hz (India's mains frequency). For a 1A regulated 5V supply, this means approximately 1000–2200 μF of bulk filter capacitance. For switching power supplies (SMPS) common in Indian electronics manufacturing, the calculations use the switching frequency and inductor values rather than mains frequency, typically resulting in smaller capacitors (100–1000 μF at lower ESR).
What is the RC time constant and why does it matter?
The RC time constant (τ = R × C) is the time taken for a capacitor to charge to about 63.2% of the supply voltage through a resistor, or discharge to 36.8% of its initial voltage. After 5τ, the capacitor is considered fully charged or discharged. For example, a 10 kΩ resistor with a 100 μF capacitor gives τ = 10,000 × 0.0001 = 1 second. This is used in timer circuits (555 timer), RC filters, and delay circuits. Converting capacitance units correctly is essential for accurate RC timing calculations.
What is the formula for capacitance conversion?
All capacitance units are linear multiples of the farad: Result = Input × (toBase_from ÷ toBase_to). Key relationships: 1 F = 1000 mF = 10⁶ μF = 10⁹ nF = 10¹² pF. One abfarad = 10⁹ F. For example, to convert 470 nF to μF: 470 × 10⁻⁹ ÷ 10⁻⁶ = 0.47 μF. To convert 47 pF to nF: 47 × 10⁻¹² ÷ 10⁻⁹ = 0.047 nF.