Converters · Electronics

SMD resistor code, in ohms.

Read the number printed on a chip resistor, or find the marking for a value. Handles 3-digit, 4-digit, R notation and EIA-96 codes.

Code or value

3-digit: the first two digits are significant and the third is the number of zeros to follow. 474 is 47 followed by four zeros, 470 kΩ. 000 is a zero-ohm jumper.
4-digit: the first three digits are significant and the fourth is the number of zeros. 8252 is 82.5 kΩ.
R notation: the letter R stands for the decimal point. 4R7 is 4.7 Ω and 24R3 is 24.3 Ω.
EIA-96: two digits pick one of the 96 values of the E96 series (01 = 100, 02 = 102 … 96 = 976) and a letter gives the multiplier: A = ×1, B = ×10, C = ×100, D = ×10³, E = ×10⁴, F = ×10⁵, G = ×10⁶, H = ×10⁷, X = ×0.1, Y = ×0.01, Z = ×0.001. 10C is 124 × 100 = 12.4 kΩ. Only these letters are accepted; some makers also use R and S, which this tool does not, since R is the decimal point elsewhere.
Sources: the code rules, the 96-entry table and the multipliers follow the Bourns CR Series thick film chip resistor datasheet; the 96 values are the E96 series of IEC 60063. Makers differ, so check the datasheet for your part, and measure with a meter when it matters.