Thai Birth-Day Colors

This calculator reads one fact: the weekday you were born on. It works that out from the date you enter, then looks it up in a table of eight birth-day signs, eight rather than seven because Wednesday is split in two. Each sign carries a colour, a ruling body from the nine Navagraha, a Buddha image, two numbers and a day traditionally treated as unfavourable. Your name is not used, and no digits are added or reduced. The optional birth hour only matters for Wednesday births: from 18:00 onwards the result moves to the Wednesday night sign, ruled by Rahu.

Take Maria Silva, born on 14 March 1990, which fell on a Wednesday. With the hour left as unknown, she is read as Wednesday day: green, ruled by Mercury (Budha), with the alms-bowl Buddha image, the numbers 4 and 5, and Monday as her unfavourable day. Had she been born at 19:00, the result would change to Wednesday night: black, Rahu, the forest-retreat image, the numbers 4 and 9, and Monday again. Add a partner's date and the two ruling bodies are scored against each other; a shared colour adds a point, a birth day that falls on the other person's unfavourable day takes two away, and the total sets the rating.

In Thailand these colours are everyday custom rather than theory. Many people know their birth-day colour as readily as their age, and some choose it for an interview, a ceremony or a temple visit. Temples often set out a row of Buddha images, one for each day, so visitors can make an offering before the figure of their own birth day. Seen that way, your colour is a small, deliberate reminder of the qualities the tradition links to your day.

The birth day also shapes naming. In the system known as taksa, Thai letters are grouped under the days of the week, and parents, or a monk asked for advice, often avoid letters counted as kalakini, or unfavourable, for the child's day. Some adults later change their name on similar guidance. This page does not perform that letter analysis, but finding your day sign is where anyone following the custom would begin.

The two numbers are cultural preferences that some people carry into a phone number, a licence plate or an address. Treat them as a pattern to notice, not a promise. The unfavourable day is similar: the page flags it when today matches, and many people simply read it as a cue to plan with a little more care.

The calculator can show you where Thai custom places your birth day; it cannot tell you anything about your character or future that you do not decide for yourself.