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Instant SMD Resistor Calculator to decode 3-digit and 4-digit SMD resistor values. Enter the code and get accurate ohms results fast and easy online.
Reading SMD resistors can feel hard because the numbers look tiny. That is why we built our SMD Resistor Calculator to make everything simple. It reads the code for you and shows the exact resistor value in ohms. Anyone can use it, even without electronics experience. You also get formulas, examples, code charts, and simple steps so you understand how everything works.
An SMD resistor is a small surface-mount resistor used in modern electronic devices. Instead of large color bands like traditional resistors, SMD resistors use numeric codes. These codes tell you the real resistance value. Once you understand the formula, reading SMD resistors becomes very easy.
The calculator follows the official SMD resistor code formula used worldwide. It can read 3-digit codes, 4-digit codes, EIA codes, and special codes like 01C or R10. When you enter the code, the calculator converts it into ohms, kilo-ohms, or mega-ohms based on the value.
For 3-Digit SMD Resistors (Standard Formula)
First two digits = significant numbers
Third digit = multiplier (number of zeros)
Formula:
Value = (First two digits) × 10^(Third digit)
Example:
Code: 102
Value = 10 × 10²
Value = 10 × 100
Value = 1000 ohms (1 kΩ)
For 4-Digit SMD Resistors
First three digits = significant numbers
Fourth digit = multiplier
Formula:
Value = (First three digits) × 10^(Fourth digit)
Example:
Code: 225
Value = 225 × 10⁵
Value = 22500000 ohms (22.5 MΩ)
For SMD Resistors with “R”
“R” replaces the decimal point.
Examples:
3R3 = 3.3 ohms
0R5 = 0.5 ohms
For EIA Codes Like 01C
These follow a manufacturer table.
01C normally means 12.4 pF capacitors, not resistors.
In resistor systems, C-type codes are rare.
For accuracy, use the manufacturer’s official SMD code list.
102 = 1 kΩ
103 = 10 kΩ
104 = 100 kΩ
472 = 4.7 kΩ
225 = 22.5 MΩ
331 = 330 ohms
These values are supported in the calculator automatically.
Standard SMD resistors do not use color bands. Instead, they use numeric or alphanumeric codes. Only classic axial resistors use color codes. This is why an SMD resistor calculator is the fastest way to get the exact value.
First, look at the code printed on your SMD resistor. Next, type the code into the calculator. The calculator then reads the digits, applies the formula, and shows the resistor value in ohms, kilo-ohms, or mega-ohms. If the resistor has a 3-digit or 4-digit code, the calculator handles it automatically. If your resistor includes an “R”, the tool converts it as a decimal. Everything happens instantly.
A 4-digit resistor works the same way as a 3-digit one, but with higher precision. The first three digits create the main number. The last digit tells you how many zeros to add. This gives a more accurate resistor value. Many high-precision circuits use 4-digit SMD parts for stable readings.
SMD resistors have standard size codes such as 0402, 0603, 0805, 1206, and so on. The numbers show the length and width of the resistor in inches. For example, 0805 means 0.08 inches by 0.05 inches. Larger sizes usually handle more power. You can read the size from the PCB layout or measure the component directly if needed.
Our SMD Resistor Calculator makes reading resistor values simple. Tiny printed codes no longer feel confusing because the tool follows the original formulas and gives you exact results. Whether you are repairing electronics, designing circuits, or learning electronics for the first time, this calculator helps you work faster and with complete accuracy. It is easy to use, mobile-friendly, and perfect for beginners and professionals.
102 equals 1000 ohms or 1 kΩ.
225 equals 22.5 MΩ.
Take the significant digits and multiply them by 10 raised to the last digit.
01C is usually a capacitor code, not a resistor. Check the manufacturer datasheet for the exact value.
3-digit codes give basic values.
4-digit codes provide higher precision.