Free Lot of Fortune Calculator

Find your Fortune sign, its traditional ruler, and its Whole Sign house. The day and night formulas are shown with your result. No account or email required.

Only have your birth details? Start with the free birth chart calculator.

Enter the Ascendant, Sun, and Moon positions from your chart. Use decimal degrees within each sign: 15°30′ = 15.5.

Use the Sun's position relative to the horizon, rather than a fixed clock time. Learn about sect.

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How to calculate the Part of Fortune

The Lot of Fortune, also called the Part of Fortune or Pars Fortunae, is a calculated point, not a planet. This tool follows the sect-reversed method: project the Sun–Moon arc from the Ascendant, reversing the arc for a night chart.

  • Day: Ascendant + Moon − Sun.
  • Night: Ascendant + Sun − Moon.
  • Wrap the answer: add or subtract 360° until the result lies from 0° to less than 360°.

The zodiac starts at 0° Aries. Taurus starts at 30°, Gemini at 60°, and each following sign adds 30°. Enter positions from the same chart and zodiac; mixing tropical and sidereal positions gives an inconsistent result.

A worked day/night example

Use Ascendant 15° Aries (15°), Sun 10° Aries (10°), and Moon 20° Taurus (50°). For the day formula, 15 + 50 − 10 = 55°, or 25° Taurus. For the night formula, 15 + 10 − 50 = −25°; add 360° to get 335°, or 5° Pisces.

This is an arithmetic demonstration, not a birth chart. Try the example above, then change the sect selection and calculate again to compare the two formulas.

Source: Paulus Alexandrinus, Introductory Matters, chapter 23, on the seven lots (Boer edition, 1958, pp. 47–51). Historical authors and modern calculators do not all use the same convention; check the chosen method when comparing results. Read our methodology.

What your result means

Traditional astrologers associated Fortune with bodily and material circumstances, and Spirit with action and intention. A sign alone is not a complete interpretation: the lot's house, its ruler, and that ruler's condition give context. This calculator identifies the sign's classical ruler and counts Whole Sign houses from the Ascendant sign; other house systems can give a different house.

Birth time unknown? Fortune depends on the Ascendant and on day/night sect. A noon placeholder cannot establish a reliable personal Fortune position. Check your birth time before treating a lot or house as specific to your chart.

Historical Use Only. This is symbolic study and entertainment, not a measure of wealth, health, or future success, and not medical or financial advice.

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Continue learning: Fortune through the twelve houses · Planetary dignities.