SMD Resistor Code Calculator

Use this SMD resistor code calculator to find the value of a surface-mount resistor from the code printed on it.

SMD resistors are too small for color bands, so they have a short code instead. With three digits, the first two are the value, and the last is how many zeros to add. Four-digit codes work the same way, with three digits for the value:

$$472=47\cdot 10^2=4700\Omega =4.7\text{ k}\Omega$$

Other Codes

An R marks the decimal point, so 4R7 is 4.7 Ω and R10 is 0.1 Ω. A code of 0 or 000 is a zero-ohm resistor, used as a jumper.

Precision resistors often use the EIA-96 code: two digits and a letter, like 01C. The digits point to a value in a table, and the letter is the multiplier. 01C is 100 × 100 = 10 kΩ.

The smallest resistors (0201 and smaller) usually have no code at all, so measure them with a multimeter. For through-hole resistors, use the resistor color code calculator.