Kalakini by Birth Day and Choosing a License Plate
An explanation of the eight Taksa letter groups, how to find which group is Kalakini for your birth day, and what to do when the plate you like contains a letter or digit that clashes with it.
Published 11 July 2026, last updated 19 August 2026
Contents
What Taksa is, and the eight groups of Thai consonants
Taksa (ทักษา) is an old Thai astrological system that divides the Thai consonants into eight groups called wak (วรรค) and links each group to the planet of a day of the week. When naming a person or a shop, or choosing a lucky number, Thai people often ask which letters are Sri (fortune), which are Det (power), and which are Kalakini (the inauspicious position).
The eight groups in use are: the group of vowels and the letter อ; ก ข ค ฆ ง; จ ฉ ช ซ ฌ ญ; ฎ ฏ ฐ ฑ ฒ ณ; ด ต ถ ท ธ น; บ ป ผ ฝ พ ฟ ภ ม; ย ร ล ว; and ศ ษ ส ห ฬ ฮ.
Each group is tied to one planet and one day. The order on the Taksa wheel is Sunday, Monday, Tuesday, Wednesday daytime, Saturday, Thursday, Wednesday night, and finally Friday, before looping back to Sunday. This is not calendar order, which is why people often mix it up.
The eight positions, and where Kalakini falls
Once you know which group belongs to your birth day, treat that group as the first position, called Boriwan (บริวาร, companions). Then move around the wheel one group at a time through Ayu (lifespan), Det (power), Sri (fortune), Mula (roots), Utsaha (diligence) and Montri (support), with the eighth position being Kalakini.
Because the wheel has exactly eight positions, the eighth position is always the group immediately before your birth day's group. This is a shortcut for checking quickly without counting each position.
In the traditional texts, Kalakini means something that runs against a particular person's fortune. It does not mean the letters are bad in themselves. Letters that are Kalakini for one person may be Sri or Det for another, so the meaning depends entirely on the individual.
Try it yourself with two examples
For someone born on a Sunday, the day's group is the vowels and the letter อ. Moving forward around the wheel through all eight positions gives Kalakini as the group ศ ษ ส ห ฬ ฮ, which is Friday's group. This means people born on Sunday are advised to avoid letter series containing these letters.
For someone born on a Monday, the day's group is ก ข ค ฆ ง. The group just before it is the vowels and the letter อ, which is therefore Kalakini for people born on Monday. Letter series containing อ are the ones this group tends to avoid.
You can do the same for every day, but remember that the order on the wheel is not calendar order. That is why this site has a separate page for each birth day, so you can see the table the system actually uses without working it out yourself, and compare it with the texts you follow straight away.
Where Kalakini digits come from
Kalakini digits are derived one step further, from the planet of the group that is Kalakini for that day. The digits 1 to 9 are tied to the Sun, Moon, Mars, Mercury, Jupiter, Venus, Saturn, Rahu and Ketu respectively, so once you know which day's group is your Kalakini, you can convert it into a digit immediately.
Take someone born on a Sunday, whose Kalakini falls on Friday's group. The digit tied to Venus (Friday) is 6, so this group is usually advised to avoid the digit 6 on their plate.
Where the texts disagree is the vowel group. Some schools hold that it has no digit of its own and use 0 instead, while others trace it back to the Sun and use 1. As a result, the Kalakini digit tables you find in different places are not always the same. This site states the table it actually uses on each birth-day page and on the page about how we calculate.
What to do if the plate you like has a Kalakini clash
The first option is to look for another plate with a similar digit sum whose letter series does not clash. This is the most straightforward approach and usually works in practice, because many plates across many series share the same sum. On this site you can filter by birth day from the start, and the system will remove clashing plates for you.
The second option is to weigh where the clash is. Some people consider the digits more important than the letters because they are the part you choose yourself. Others consider the letters more important because they sit at the front of the plate. The texts do not give a single answer, so decide according to what you are comfortable with.
The third option is to accept it and move on, if you give Chinese beliefs more weight than Thai ones, or you like the number for personal reasons that nothing else can replace. We did not write this article to make you afraid, but so that you know what you are choosing.
A caution about differences between texts
Taksa tables are something users can check instantly against the books they have at home, so this is where fortune-telling websites are most often challenged. The most common differences are in how rarely used letters are grouped and how groups are converted into digits.
Our position is to keep the tables separate from the program, state which version we use, and disclose when changes are made and why. If you follow a text that differs from ours, use the breakdown the system shows as your starting point and adjust your reading according to your own text.
And as we stress on every page of this site, these beliefs are a personal matter. They are here to help you choose with peace of mind, not to guarantee any outcome.
Numbers mentioned in this article
FAQ on this topic
If I was born on a Wednesday evening, is that Wednesday daytime or Wednesday night?
Taksa splits Wednesday into daytime and night, using sunset as the approximate dividing line. People born after sunset and before sunrise the next day count as Wednesday night, or Rahu. If you were born close to the changeover and are unsure, try calculating both ways and choose a plate that passes both, which is the safest option.
Whose birth day should be used for a family car?
The texts do not fix this. In practice most people use the birth day of the regular driver or of the owner named in the registration book. If several people share the car, choose one person as the main reference and also look for a plate that does not clash with the others' Kalakini. The search page can apply layered filters like this.
Is having one Kalakini digit very bad?
The system deducts points from the personal score and shows a warning bar, but it does not rule that you must not buy. The texts treat it as a caution, not a command. The decision depends on how much weight you give Thai beliefs compared with other factors such as price and personal preference.
Does this site store the birth day I enter?
No. Your birth day is used only to work out number compatibility. It is not saved to a database or to system logs, and it is not linked to your identity even if you later reserve a plate.
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Numerology readings are a matter of personal belief. Please use your own judgement. They are not a guarantee of any outcome.