01How do I calculate my lucky number by date of birth?
Take the day of the month you were born on and add its digits until one digit is left. Born on the 23rd: 2 + 3 = 5. Born on the 29th: 2 + 9 = 11, then 1 + 1 = 2. That single digit is the mulank, and it is what Indian numerology calls your lucky number. Only the day counts, so the month and year do not change it. The second number the tradition reads is the bhagyank, made by adding every digit of the full date; the calculator shows both, with each step printed so you can check the arithmetic by hand.
02What is my lucky colour by date of birth?
In ank jyotish, the Indian number tradition, each digit belongs to a graha: 1 the Sun, 2 the Moon, 3 Jupiter, 4 Rahu, 5 Mercury, 6 Venus, 7 Ketu, 8 Saturn and 9 Mars. The lucky colour by date of birth is the colour of the graha that rules your mulank. Those colours are older than numerology: the classical descriptions of the grahas give the Sun a copper-red body, Mercury the green of durva grass, Jupiter yellow and Saturn a dark one. Reading them as a person's colour because of the day they were born is the modern application, and we label it that way.
03What is the lucky colour for today?
The lucky colour for today is the colour of the graha that rules today's weekday. Each day of the week is named after its lord: Sunday the Sun, Monday the Moon, Tuesday Mars, Wednesday Mercury, Thursday Jupiter, Friday Venus and Saturday Saturn. So Tuesday's colour is red and Thursday's is yellow, for everyone, whatever their date of birth. This page works out today's colour from the date in India (IST). One detail most sites skip: in a panchang the weekday, the vara, begins at sunrise, so before dawn the traditional day is still the previous one.
04Which numbers are friendly to my mulank?
Friendly and contrary numbers are read through the grahas that rule them, using the natural friendship table of Jyotish, the same table Graha Maitri is scored from in kundali matching. For a mulank 1, ruled by the Sun, the friendly numbers are 2, 3, 5 and 9. For a mulank 5, ruled by Mercury, they are 1, 4, 6 and 8. Rahu and Ketu, who rule 4 and 7, are not in the classical table, so their places follow the modern convention. The calculator sorts all nine digits into friendly, neutral and contrary for your mulank, and lists the dates of the month that reduce to each.
05Does the time of birth change the lucky number by date of birth?
No. The mulank uses only the day, and the bhagyank the full date, so a lucky number by date of birth and time is the same number at 6 am or at 11 pm. One caution: a birth just after midnight belongs to the new calendar date, so use the date on the birth certificate. The time matters for the birth chart instead. Your janam kundli needs it for the lagna, and a gemstone is chosen classically from the lagna's lords, not from a number.
06Can a lucky number predict a lottery or satta result?
No. A mulank describes a birth date in the tradition's terms; it has no connection to how numbers are drawn, and no numerologist, calculator or astrologer can tell which number a lottery or a satta draw produces. Draws are random by design. There is no evidence that any number chosen by date of birth wins more often, and this page does not give lottery numbers. If a site offers a winning number for a fee, that offer is the thing to be wary of.
07Where do lucky numbers and lucky colours come from?
From three layers of different age. The graha colours, weekdays and directions are classical Jyotish. The mapping of the digits 1 to 9 to the grahas is Indian ank jyotish, a later practice. Treating a person's birth day as a key to a colour or a day is the modern application, popular in the last century and without a classical text behind it. The tradition reads a mulank as a description; it does not promise that a colour or a number changes what happens, and nothing here does either.