eMMC/SD Sector-to-Byte Offset Calculator

Convert sector number to byte offset, or byte offset to sector number (512-byte sectors by default).

Direction Sector size (bytes) Sector number (or byte offset, per direction above)

How this works

Useful when writing raw images with dd (its seek=/skip= options are in block-size units, not bytes) or when reading a partition table's LBA start values and needing the actual byte offset into the device or image file.

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