The Lo Shu grid calculator places the digits of a date of birth on the 3x3 grid and reads which cells fill, which stay empty, and which of the eight lines complete — with what the method says each of those means.
Every digit of the date, written DD MM YYYY, plus the driver, conductor and Kua numbers. Zeros are discarded — a zero has no cell.
The arrangement 4-9-2 / 3-5-7 / 8-1-6 is the one the source material uses throughout. It mentions a second arrangement but never lays it out, so this tool does not invent one.
A missing number is read as a capacity that has to be built on purpose. The method treats it as a starting point for work, never as a sentence.