Capacitor Value Conversion Calculator and Code Guide

A capacitor value conversion calculator translates a capacitor’s printed code or value between common units such as picofarads (pF), nanofarads (nF), and microfarads (µF). Enter a capacitance and its unit to get the equivalent values; for a three-digit marking, first decode the code using the guide below, then convert the result.

Formula

The calculator uses these unit relationships:

• Nanofarads = picofarads ÷ 1,000
• Microfarads = picofarads ÷ 1,000,000

Here, cap is the capacitance entered in picofarads (pF), nf is the equivalent capacitance in nanofarads (nF), and uf is the equivalent capacitance in microfarads (µF). The conversions are exact decimal scale changes: 1 nF = 1,000 pF, and 1 µF = 1,000,000 pF. The calculator takes pF as its input unit so that a single number can be converted consistently; convert a value from another unit to pF first, or decode its marking before entering it.

Worked Example

Using the default input, cap = 10,000 pF:

1. Convert to nanofarads: 10,000 ÷ 1,000 = 10.00 nF.
2. Convert to microfarads: 10,000 ÷ 1,000,000 = 0.01000 µF.

Therefore, 10,000 pF = 10 nF = 0.01 µF. The extra decimal places shown are formatting, not a claim that the capacitor itself is accurate to that many digits.

How to Read Capacitor Markings

Many small ceramic capacitors use a three-digit code. The first two digits are significant figures; the third digit gives the number of zeros to append, with the result expressed in picofarads. For example, code 104 means 10 followed by four zeros: 100,000 pF, which is 100 nF or 0.1 µF. Code 472 means 47 followed by two zeros: 4,700 pF, or 4.7 nF.

This convention is common, but not every marking follows it. A letter may indicate tolerance, a voltage rating may appear beside the capacitance code, and some parts use a direct value or a different manufacturer-specific marking. Read the component’s datasheet when the marking is ambiguous. Do not treat a voltage or tolerance marking as part of the capacitance number.

Some components use a letter as a decimal marker. For example, a marking such as 4n7 commonly represents 4.7 nF. Letter codes can also identify tolerance or temperature characteristics depending on their position and the component system, so use context rather than assuming every letter has one universal meaning.

Unit Conversions and Useful Examples

Capacitance units differ by factors of 1,000. A reliable way to check a conversion is to write the value in scientific notation and track the powers of ten:

• 1 µF = 1,000 nF = 1,000,000 pF.
• 1 nF = 0.001 µF = 1,000 pF.
• 1 pF = 0.001 nF = 0.000001 µF.
• 4.7 µF = 4,700 nF = 4,700,000 pF.
• 220 pF = 0.22 nF = 0.00022 µF.

The Greek letter µ means “micro,” or one millionth. It is often typed as “u” when the symbol is unavailable, so uF and µF generally denote the same unit. Likewise, “n” in a marking can stand for nanofarads. Keep the unit attached to the number while calculating: 4.7 nF is not 4.7 µF, a difference of a factor of 1,000.

When to Use a Conversion Calculator

Use a converter when a schematic, parts list, datasheet, or component marking expresses capacitance in a different unit from the one you need. Engineers and hobbyists often encounter the same nominal value written in different forms: 100 nF, 0.1 µF, and 100,000 pF are equivalent. Converting the units helps compare values without changing the component’s capacitance.

For a marked capacitor, the useful sequence is:

1. Identify the marking and confirm whether it is a capacitance code, a direct value, or another rating.
2. Decode the capacitance into a number and unit, commonly pF for a three-digit code.
3. Enter that number in pF and read the equivalent nF and µF values.
4. Compare the result with the required nominal value, tolerance, voltage rating, and component type.

A calculator only performs arithmetic. It cannot determine whether a particular capacitor is suitable for a circuit. Required voltage rating, tolerance, polarity, temperature behavior, frequency response, and physical construction depend on the application and must be checked separately.

Common Mistakes and Calculator Limits

The most common conversion error is moving the decimal point in the wrong direction. Since a microfarad is larger than a nanofarad, the numerical value gets larger when converting µF to nF, and smaller when converting nF to µF. For example, 0.047 µF is 47 nF—not 0.047 nF.

• Mixing units: Never compare bare numbers if one is in pF and the other is in µF.
• Misreading code digits: In a three-digit code, the third digit is a multiplier, not another significant digit. Code 103 is 10,000 pF, not 103 pF.
• Assuming unlimited precision: A calculated result may show several decimals, but the part’s tolerance determines how close its actual capacitance is to its nominal value.
• Confusing capacitance with voltage: A number marked with V may refer to rated voltage, not capacitance.

The conversion itself does not account for tolerance, measurement conditions, aging, temperature, or frequency-dependent behavior. Nor does it identify the capacitor from a photograph or resolve an unclear marking. For those questions, consult the manufacturer’s documentation or measure the component with suitable equipment. When working with a circuit, follow its documentation and make sure stored energy is safely discharged before handling components; capacitors can retain charge after power is removed.

Frequently Asked Questions

How many nanofarads are in one microfarad?
One microfarad equals 1,000 nanofarads. For example, 0.1 µF is 100 nF.

How do I convert pF to µF?
Divide the picofarad value by 1,000,000. For instance, 47,000 pF ÷ 1,000,000 = 0.047 µF.

What does capacitor code 104 mean?
Under the common three-digit pF code, 104 means 10 followed by four zeros: 100,000 pF, equal to 100 nF or 0.1 µF.

Is 100 nF the same as 0.1 µF?
Yes. Both values equal 100,000 pF; they are different unit expressions for the same nominal capacitance.

Does a conversion tell me which capacitor to use?
No. It establishes equivalent capacitance values only. Check the circuit’s requirements and the component’s tolerance, voltage rating, polarity, and other relevant specifications before choosing a part.

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in cap | Capacitance | pF | 10000 | 0
out nf | Capacitance | nF | cap / 1000 | 2
out uf | Capacitance | µF | cap / 1000000 | 5