How Tarot Birth Cards Are Calculated
Birth cards are one, two or three Major Arcana cards linked to your date of birth. The most widely used method was popularised by tarot author Mary K. Greer in her book Who Are You in the Tarot? Here is exactly what the calculator does:
- Add your birth month, day and year as whole numbers. For 15 July 1990: 7 + 15 + 1990 = 2012.
- Add the digits of the total until the number is 22 or less: 2 + 0 + 1 + 2 = 5.
- If the number has two digits, add them again to get the next card. Keep going until you reach a single digit.
The numbers you pass through are your birth cards. In the example, the result is 5, The Hierophant, which belongs to the 5 constellation along with Temperance (14).
Worked Examples
| Birth date | Month + day + year | Reduce | Birth cards |
|---|---|---|---|
| 15 July 1990 | 7 + 15 + 1990 = 2012 | 2+0+1+2 = 5 | The Hierophant (5) |
| 23 February 1956 | 2 + 23 + 1956 = 1981 | 1+9+8+1 = 19, then 1+9 = 10, then 1+0 = 1 | The Sun (19), Wheel of Fortune (10), The Magician (1) |
| 9 March 1985 | 3 + 9 + 1985 = 1997 | 1+9+9+7 = 26, then 2+6 = 8 | Strength (8) |
| 30 December 1999 | 12 + 30 + 1999 = 2041 | 2+0+4+1 = 7 | The Chariot (7) |
When the reduction lands on 22, it counts as The Fool (card 0), which then reduces to 4, The Emperor.
The Nine Birth Card Constellations
Cards that reduce to the same single digit form a group, or constellation. Even if your calculation gives only one card, you share the themes of your whole constellation.
| Constellation | Cards | Core theme |
|---|---|---|
| 1 | The Magician (1), Wheel of Fortune (10), The Sun (19) | Will, timing and success |
| 2 | The High Priestess (2), Justice (11), Judgement (20) | Intuition, truth and calling |
| 3 | The Empress (3), The Hanged Man (12), The World (21) | Creation, surrender and completion |
| 4 | The Emperor (4), Death (13), The Fool (0) | Structure, change and new beginnings |
| 5 | The Hierophant (5), Temperance (14) | Meaning, teaching and balance |
| 6 | The Lovers (6), The Devil (15) | Choice, desire and attachment |
| 7 | The Chariot (7), The Tower (16) | Drive and breakthrough |
| 8 | Strength (8), The Star (17) | Courage and hope |
| 9 | The Hermit (9), The Moon (18) | Inner search and intuition |
The Major Arcana has 22 cards, and every one of them appears in some constellation. Constellations 1 to 4 have three cards each; constellations 5 to 9 have two.
What Birth Cards Mean
In Greer’s approach, your birth cards describe lifelong themes rather than a fixed fate. If you have two cards, the higher number often shows the outer task or challenge, and the lower number shows the inner resource you bring to it. Some readers call the higher card the “soul card” and the lower card the “personality card”, though usage varies between authors.
Many people find it interesting to look out for their birth cards when they do readings, or to reflect on how the themes show up at different times of life.
About Tarot And This Calculator
Tarot cards were first made in 15th-century Italy for a card game. Their use for divination and self-reflection grew from the 18th century onward. The most familiar modern deck, the Rider-Waite-Smith, was published in 1909 with illustrations by Pamela Colman Smith.
There is no scientific evidence that birth dates or tarot cards reveal personality or predict events. We offer this calculator as a reflective tradition and a bit of fun. The calculation is simple arithmetic, done in your browser, and your date of birth is not sent to us.
Frequently Asked Questions
How do I calculate my tarot birth card?
Add your birth month, day and four-digit year together. Add the digits of the total until you get a number of 22 or less. That number is your first birth card. If it has two digits, add them to get your second card.
Why do I only have one birth card?
If your total reduces straight to a single digit, you have one main card. You still belong to that card’s constellation and share its themes with the higher-numbered cards in it.
What does it mean to have three birth cards?
Three cards only happen in constellation 1 (Sun, Wheel of Fortune, Magician), when your number reduces from 19 to 10 to 1. Readers often see it as a strong emphasis on will, timing and success.
Is the tarot birth card the same as a zodiac sign?
No. Birth cards come from numerology applied to the tarot, using your full date of birth. Some readers also link each zodiac sign to a Major Arcana card, but that is a separate system.
Is my birth date stored?
No. The calculation runs in your browser and your date is not sent to our server. Your last result is kept only on your device.
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