Free Birth Chart Calculator

A birth chart (also called a natal chart) is a snapshot of the sky at the exact moment and place you were born. It maps where the Sun, Moon and every planet sat among the twelve zodiac signs, and divides the sky into twelve houses — areas of life. Reading those positions together gives a far richer picture of your personality than your Sun sign alone.

Your Big Three are the three most important points in your chart. Your Sun sign is your core identity — who you are at your center. Your Moon sign is your inner emotional world and what makes you feel safe. Your Rising sign (Ascendant) is the mask you wear — the first impression you give and how you instinctively approach the world.

For your Sun and planet signs, no — your birth date alone is enough. But your Moon sign, Rising sign and house placements depend on your exact birth time and place, because they change quickly throughout the day. If you don’t know your time, this calculator still gives you accurate Sun and planet signs and marks the time-sensitive parts.

It uses a real astronomical ephemeris engine (the same kind used for serious astronomy software) to compute the true position of the Sun, Moon and planets for your birth moment, plus your Ascendant from sidereal time. Everything runs privately in your browser — nothing is uploaded. Whole Sign houses are used.

Your Rising sign, or Ascendant, is the zodiac sign that was rising on the eastern horizon when you were born. It changes roughly every two hours, which is why your exact birth time matters. It shapes your appearance, your first impression, and the lens through which you meet the world.

The twelve houses are areas of life — self, money, relationships, career and so on. A planet’s house shows where its energy plays out. Aspects are the angles planets make to each other (conjunction, sextile, square, trine, opposition); they describe how the parts of your personality cooperate or create tension.

The astronomical positions are precise. The interpretations are a tool for self-reflection and entertainment, not prediction or professional advice. Many people find their Big Three uncannily relatable — but you are always more than your chart.