Calculators » CRC-8 Calculator | CRC8 Formula, Polynomial & Examples

CRC-8 Calculator | CRC8 Formula, Polynomial & Examples

crc-8 crc8 calculator formula calculator

CRC-8 (Cyclic Redundancy Check - 8 bit) is a lightweight error detection technique widely used in embedded systems, communication protocols and data storage. It generates an 8-bit checksum from an input data stream using polynomial division over GF(2).

In this CRC-8 calculation method, the input data is processed byte by byte, starting from the most significant bit (MSB). Each byte is XORed with the current CRC value, followed by bitwise left shifts and conditional XOR with the selected polynomial. This approach matches the provided JavaScript implementation and supports custom CRC-8 polynomials. This page will cover CRC-8 Calculator and formula.

CRC8 checksum Calculator

Example : CRC-8 (Standard / ATM / ITU)

INPUTS:

Data Vector : “313233343536373839”
Polynomial: 0x07
Init: 0x00
XorOut: 0x00
RefIn: 0 (i.e. FALSE)
RefOut: 0 (i.e. FALSE)

OUTPUT: CRC-8 Checksum Output (Hex) = 0xf4 (Hex)

Example-2 :

Inputs:

Data Vector : “12AB34FF”
All other input values same as example-1

Output: CRC-8 Output : 0xB1 (Hex)

CRC-8 Formula

CRC-8 Calculation Formula

Common CRC-8 Variants (Parameter Reminder)

(Check following for ASCII input : “123456789” i.e. enter Data Vector as String (Hex) = 313233343536373839)

CRC-8 Type : Poly = 0x07, Init = 0x00, RefIn = False, RefOut = False, XorOut = 0x00, Checksum = 0xF4
CRC-8/ITU : Poly = 0x07, Init = 0x00, RefIn = False, RefOut = False, XorOut = 0x55, Checksum = 0xA1
CRC-8/MAXIM : Poly = 0x31, Init = 0x00, RefIn = True, RefOut = True, XorOut = 0x00, Checksum = 0xA1
CRC-8/ROHC : Poly = 0x07, Init = 0xFF, RefIn = True, RefOut = True, XorOut = 0x00, Checksum = 0xD0

Summary: CRC-8 produces an 8-bit checksum for error detection. This CRC-8 approach is simple, efficient and ideal for resource constrained systems and real time data validation.