Birthday Rarity Calculator

Find how rare your birthday is statistically.

How It Works

  1. Enter your birthday. Type month (1–12) and day to check how common your birth date is.
  2. See rarity label. The main result classifies your date as common, average, uncommon, or rare.
  3. Rarity score & rank. Get a 0–100 score and rank out of 366 (leap day = rarest).
  4. Zodiac insights. Western sign, element, modality, and optional Chinese zodiac from birth year.
  5. Fun facts. Birthstone, flower, famous birthdays, and countdown to your next birthday.

Also try our Half Birthday Calculator or Age Difference Calculator.

Enter values to see results.

Formula & Reference

Rarity rank ≈ US birth-frequency model (366 = rarest)