Free tool
Free Birth Chart Calculator
Discover the exact position of every planet the moment you were born. Astreya generates a full natal chart — free, in English, using the same tropical Placidus system professional astrologers rely on.
- ✦ Sun, Moon and Rising sign
- ✦ All 10 planets + Chiron, Lilith, North Node
- ✦ 12 houses with Placidus cusps
- ✦ Major aspects with tight orbs
- ✦ Swiss-Ephemeris-grade precision
- ✦ Instant, no signup required
What is a birth chart?
A birth chart (or 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 stood relative to the horizon and to each other. From that map, astrology reads personality, gifts, blind spots, timing and relationships.
Astreya's calculator uses tropical zodiac coordinates and Placidus houses — the modern Western standard — with an ephemeris precise to fractions of a degree. Enter your date, time and place of birth and you'll get an accurate chart in seconds, plus optional AI-generated interpretation.
Frequently asked questions
Is the birth chart really free?
Yes. Astreya calculates your full natal chart — Sun, Moon, Ascendant, all planets, houses and major aspects — for free. Only the deep AI interpretation report is a paid upgrade.
What do I need to generate my birth chart?
Your exact date of birth, time of birth (as precise as possible) and city of birth. Time matters because the Ascendant and houses shift roughly one degree every four minutes.
Which house system and zodiac do you use?
We use the tropical zodiac and the Placidus house system — the professional standard in Western astrology — with high-precision Swiss-Ephemeris-grade calculations.
What if I don't know my exact birth time?
You can still compute a solar chart (planets in signs, aspects, transits). Ascendant, Midheaven and house placements require a known birth time.
Is my data private?
Your birth data is used only to compute your chart. We don't sell it and don't share it with third parties.