SMD capacitor code calculator — pF decoder

About the model

Ceramic SMD capacitors are marked with a three-character code in picofarads: the first two digits are the value and the third is the exponent of ten, so 104 reads as 10×10⁴ = 100 nF. When an R appears it stands for the decimal point, so 4R7 is 4.7 pF. The tolerance letter (J/K/M) and the voltage code (EIA-198, 1A = 10 V up to 3A = 1000 V) are often printed alongside.

The physical size 0603, 0805 or 1206 usually tells you the voltage rating the part was built for — bigger packages can hold higher voltages. On power designs, always check the datasheet for ripple current handling and DC bias derating before trusting the printed value alone.