Birth-Day Power Numbers and Your License Plate Digit Sum

What birth-day power numbers are and where they come from

In the Maha Taksa branch of Thai astrology, each of the eight day planets has what is called a planetary power (กำลังดาว). It is a number belonging to each planet, long used in many contexts, from casting horoscopes and setting the number of recitations of the Itipiso chant at one more than your age, to choosing numbers that relate to your birth day.

The planetary power numbers that most texts agree on are: Sunday 6, Monday 15, Tuesday 8, Wednesday daytime 17, Thursday 19, Friday 21, Saturday 10, and Rahu 12 for people born on Wednesday night. Together these eight values cover every Thai birth day, with Wednesday daytime and Wednesday night treated separately.

When this tradition meets license plates, the most widespread use is to check whether the plate's numerological digit sum matches the owner's birth-day power number (เลขกำลังวันเกิด). If it matches exactly, the texts consider that plate to give special support to the planet of the owner's birth day.

The power numbers of all eight days and what each planet means

People born on Sunday have the Sun as their day planet, with a power of 6. The Sun stands for authority, leadership and honour. People born on Monday have the Moon, with a power of 15, standing for charm, gentleness and being loved by others.

People born on Tuesday have Mars, with a power of 8, standing for courage, determination and the strength to push through. People born on Wednesday daytime have Mercury, with a power of 17, standing for negotiation, trade and wit. For people born on Wednesday night, the texts assign Rahu as the day planet, with a power of 12, standing for change and luck that comes with sudden reversals.

People born on Thursday have Jupiter, with a power of 19, standing for wisdom, teachers and trustworthiness. People born on Friday have Venus, with a power of 21, standing for wealth, love and enjoyment. And people born on Saturday have Saturn, with a power of 10, standing for patience, discipline and a stable foundation.

How to use it correctly with a license plate

First, calculate the plate's numerological digit sum as usual, by adding the values of the series letters, the leading digit before the series if there is one, and every digit of the plate number. Then compare the result with the birth-day power number of the person who uses the car. If they match exactly, for example someone born on Friday gets a plate with a digit sum of 21, this school considers it a special point of support.

What you should understand clearly is that matching the day's power number is supplementary information, not a main criterion. A plate whose digit sum does not match the power number is not bad, because each digit sum already has its own meaning in the numerology table. For example, a digit sum of 24 or 45, which the texts consider strong for wealth, is just as strong whatever day the owner was born.

The suggested order is to first filter out plates that clash with your birth-day Kalakini (กาลกิณี), the letters and digits considered inauspicious for your birth day. Then pick from the well-graded digit sums, and only then use the power number as a tie-breaker when comparing several plates with similar qualities. This gives you a plate free of any major cautions, with a special point of support if one is available.

On each plate's page on this site, when you select your birth day in the birth-day check box, the system always shows that day's power number and clearly tells you when the plate's digit sum matches it exactly. The plate's overall score is not changed by this, because we treat it as information to help your decision, not as a score multiplier.

Real reading examples

Suppose someone born on Monday is choosing between two plates, both with a good digit sum grade. The first has a digit sum of 15 and the second 24. The first matches the Moon's power exactly, while the second is strong for wealth according to numerology. There is no wrong answer here; it depends on whether the owner gives more weight to supporting the birth-day planet or to the meaning of the digit sum.

In another example, someone born on Wednesday night finds a plate with a digit sum of 12 whose letter series does not clash with their Kalakini. This counts on both fronts: the digit sum matches the power of Rahu, their birth-day planet, and there is no caution about the letters. This school would consider it a plate that suits its owner especially well.

The same caution applies as with every system: do not use this as a reason to pay beyond your budget. If a plate matches your power number but is priced well above the market median for its comparison group, always compare it with plates of similar qualities in the catalogue before deciding.