Decode 3-digit capacitor codes to pF, nF and µF — or encode a capacitance value to find the printed code. Includes tolerance letter decoder.
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Common Capacitor Codes Reference
Code
pF
nF
µF
Common use
Tolerance Codes
Letter
Tolerance
Type
B
±0.1 pF
Absolute (small values)
C
±0.25 pF
Absolute (small values)
D
±0.5 pF
Absolute (small values)
F
±1%
Percentage
G
±2%
Percentage
J
±5%
Standard ceramic
K
±10%
Standard ceramic
M
±20%
Electrolytic
Z
+80% / −20%
Electrolytic
Frequently Asked Questions
How do I read a 3-digit capacitor code? ▾
The first two digits are significant figures. The third digit is the exponent (power of 10) in picofarads. For example: 104 = 10 × 10⁴ pF = 100,000 pF = 100 nF = 0.1 µF. Exception: if the third digit is 8 or 9, it's a special multiplier (×0.01 and ×0.1 respectively).
What does capacitor code 104 mean? ▾
104 = 10 × 10⁴ pF = 100,000 pF = 100 nF = 0.1 µF. This is one of the most common values, used as a decoupling capacitor on power supply pins of ICs.
Why do some capacitors have no code? ▾
Very small SMD capacitors (0402, 0201) often have no marking because there isn't enough space. Large electrolytic capacitors are usually marked directly with their value in µF and voltage rating.
What is the difference between pF, nF and µF? ▾
1 µF = 1000 nF = 1,000,000 pF. Ceramic capacitors are typically in pF to nF range. Film capacitors: nF to µF. Electrolytic and tantalum: µF range. Supercapacitors: Farads (F).