CRC & checksum calculator
Calculate configurable 1–64 bit CRCs, automotive presets, and simple byte checksums. Select byte coverage and compare an expected result.
Your result
ON YOUR DEVICEEnter your inputs and calculate to see the result.
Check the exact covered bytes.
Preset parameters are visible and editable; editing a parameter selects Custom. For the text 123456789, SAE J1850 returns 0x4B. Byte indices apply after text encoding. Include Data IDs and counters in the correct order when required by your protocol; the calculator processes the selected bytes as supplied. The exported result includes coverage and parameters.
CRC parameters: width, polynomial, init, refin, refout, xorout
Byte coverage: [first index, first index + count)