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Film Capacitor Code Calculator (IEC 60062 / IEC 60384)

Decode alphanumeric markings on polyester (MKT), polypropylene (MKP), and metalized film capacitors into capacitance, tolerance, and voltage.

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Convert Capacitance to Code
Target Capacitance
Tol.
DETAILED SPECIFICATIONS
Rated Capacitance
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Capacitor Tolerance
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Tolerance Range
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Standard / Class
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Input Parameters Specification

Capacitance MarkingsStandard 3-digit alphanumeric codes (e.g. 103, 224) stamped directly on the protective epoxy coating.
Tolerance Code SuffixA trailing letter representing manufacturing limits ranging from ±0.05% (A) up to -20/+80% (Z).
Unit DefinitionStandard conversion thresholds calculated natively in Farads (F) and converted to µF, nF, or pF.
Voltage Limit RatingSome film markings include preceding letters indicating specific voltage tolerances.

Practical Operational Examples

103H Film Capacitor (10 nF)

Decodes as 10 × 10^3 pF = 10,000 pF (10 nF) with a precision rating of H (±3% tolerance).

224K Polyester block (220 nF)

Decodes as 22 × 10^4 pF = 220,000 pF (220 nF = 0.22 µF) with standard K (±10% tolerance).

474J Power Filter (470 nF)

Decodes as 47 × 10^4 pF = 470,000 pF (470 nF) with standard high-efficiency J (±5% tolerance).

105M Mylar Coupling (1 µF)

Decodes as 10 × 10^5 pF = 1,000,000 pF (1 µF) with M (±20% tolerance) inside high-density audio setups.

Diagrams & Theory

Film capacitors utilize a thin polymer plastic film (such as polyester, polypropylene, or polycarbonate) as the dielectric, layered with thin metallic electrodes.

Unlike ceramic disk capacitors, film capacitors have superior self-healing properties, exceptionally low equivalent series resistance (ESR), and high voltage stability, making them the standard choice for AC circuit networks, audio crossovers, and power supplies.

Formulas & Mathematical Logic

For 3-Digit System: Capacitance (pF) = (Digit 1 × 10 + Digit 2) × 10^Multiplier
Conversion Ratios: 1,000 pF = 1 nF | 1,000,000 pF = 1 µF = 1,000 nF

Step-by-Step Example

Example: Decodifying an "224K" Film Capacitor
Step 1: Extract the first two numbers as base values: "22".
Step 2: Identify the third digit as multiplier: "4" (representing 10^4 = 10,000).
Step 3: Multiply base value by multiplier: 22 × 10,000 = 220,000 pF.
Step 4: Convert units: 220,000 pF = 220 nF = 0.22 µF with a ±10% precision rating.

How to Use This Calculator

Locate the printed alphanumeric figures on the face of the active film capacitor.
Type the 3-digit capacity code and choose the tolerance letter directly inside the graphic.
The rated capacitance, alternate unit representations, and tolerance range are computed instantly.
To reverse-calculate, enter the targeted capacitance into the manual conversion panel below.

Frequently Asked Questions

1. What does the tolerance letter 'J' stand for in film capacitors?

The tolerance letter 'J' stands for a manufacturing deviation allowance of ±5% from the nominal capacitance rating.

2. Why are polypropylene capacitors preferred in audio crossovers?

Polypropylene caps have extremely low dielectric absorption, low dissipation factor, and minimum distortion profiles, preserving signal purity in acoustic speaker systems.

3. Are film capacitors polarized?

No, standard metalized polyester and film capacitors are non-polarized components. They can be safely wired in both AC and DC orientations.

4. How is tolerance range calculated?

The range represents the minimum and maximum boundaries of actual capacity. For example, a 100 nF capacitor with ±10% tolerance is guaranteed to measure between 90 nF and 110 nF.

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About this tool

Film Capacitor Code Calculator (IEC 60062 / IEC 60384) is a free online calculator tool. Use it to get instant, accurate results for your electronics calculations.