SMD resistor code calculator

3 digit: two significant digits, then the number of zeros      472 = 47 × 10² = 4.7 kΩ
4 digit: three significant digits, then the number of zeros    1002 = 100 × 10² = 10 kΩ
R is the decimal point                                         4R7 = 4.7 Ω, 31R6 = 31.6 Ω
EIA-96: code 01 to 96 picks the E96 value, letter multiplies   01C = 100 × 100 = 10 kΩ

Entering a code

Type the digits without the R and choose where the R sat. 4R7 is digits 47 with the R after the 1st digit.

Tolerance

The marking does not state tolerance. In the Yageo scheme 3 digit codes mark 5% E24 parts (in 0603, a bar under the code marks a 1% E24 part), 4 digit codes mark 1% and tighter E24 and E96 parts in 0805 and larger, and EIA-96 codes mark E96 parts of 1% and tighter in 0603.

EIA-96 letters

Y × 0.01, X × 0.1, A × 1, B × 10, C × 100, D × 1k, E × 10k, F × 100k (Yageo), and H as an alternative to B (TT Electronics). TT Electronics also uses S for × 0.01 and R for × 0.1, but other published tables swap those two and add Z for × 0.001, so this calculator does not decode R, S or Z: check the maker’s marking document.