Free birth chart calculator
Enter your birth date, time and city to draw your full natal chart — the planets, houses and aspects, not just a sun sign. Don’t know your time? Tick the box and we’ll cast a solar chart instead.
What a birth chart is
A birth chart — also called a natal chart — is a snapshot of the sky at the exact moment you were born, seen from the exact place you were born. Drawn as a circle, it maps where each planet sat against the twelve zodiac signs and the twelve houses at that instant. It is the astrological equivalent of a full photograph rather than a single word.
To draw one accurately you need three things: your date of birth, the time as precisely as you can get it, and the city. The time matters because the rising sign and the house system both shift roughly every two hours. If the time is unknown, you can still read most of the chart — you just lose the houses and the rising sign.
The chart is not a prediction. It is a map of themes. People who find astrology useful tend to treat it the way a reflective person treats a good personality test — as a lens for self-observation, not as a script.
The big three: sun, moon, rising
If you remember nothing else from a birth chart, remember the three signs that carry the most weight in most readings.
- Sun sign — the part of you the world sees most clearly. Identity, drive, the story you tell about yourself. This is the one you already know.
- Moon sign — the inner life. Emotional habits, what soothes you, what you do when no one is watching. The moon changes signs every two and a half days, so people born on the same day can have very different moons.
- Rising sign (ascendant) — the mask. The first impression you make, the way you meet new situations, the costume your sun and moon wear in public. Requires a known birth time.
A good first pass at a chart is simply: what are my big three, and do I recognise myself in all three? The answer is often “yes to one, sort of to another, and the third reads like someone I thought I was pretending.”
The ten planets
In astrology, the sun and moon get counted as “planets” along with the eight real ones. Each one is read as a different function of the self, and each one sits in a sign and a house.
- Mercury — how you think and speak.
- Venus — what you love, what you find beautiful, how you connect.
- Mars — drive, anger, appetite, how you go after what you want.
- Jupiter — expansion, luck, where you overdo it.
- Saturn — structure, discipline, the place where life hands you slow lessons.
- Uranus — disruption, freedom, the lightning-strike signs.
- Neptune — dreams, imagination, places of quiet delusion.
- Pluto — death and rebirth, long transformations, buried material.
The outer three (Uranus, Neptune, Pluto) move so slowly they describe generational themes as much as personal ones. Venus, Mars and Mercury are the more personal planets that show up in day-to-day behaviour.
The twelve houses
If the signs are the “how,” the houses are the “where.” They divide a chart into twelve slices, each one a life area: the first house is self and appearance, the seventh is partnership, the tenth is career and public life, and so on all the way around.
When you read a planet, you read three things together — which planet, in which sign, in which house. A Mars in Cancer in the tenth house tells a very different story from a Mars in Aries in the fourth. The houses are why two people with the same sun sign can live wildly different lives.
Aspects — how the pieces talk
Aspects are the angles planets make to each other in the chart. The classic five: conjunction (same spot), sextile, square, trine, and opposition. Squares and oppositions are read as tension, sextiles and trines as flow, conjunctions as intensity. A chart with many squares often describes an internally-argumentative person. A chart with many trines often describes someone gifted who has to manufacture their own friction to grow.
Aspects are where the chart stops being a list and starts reading like a story. They are also the most satisfying piece to learn, because they turn the separate planets into a working system.
What a sun-sign reading misses
Sun-sign horoscopes work by collapsing the entire chart into one of twelve buckets. That is roughly the accuracy of describing a person by the first letter of their name. Useful shorthand, terrible precision.
The richer reading — the one a birth chart enables — comes from holding several overlapping signals at once. A Leo sun with a Pisces moon and a Virgo rising is not a “Leo.” She is a Leo-Pisces-Virgo blend, and every real astrologer will start by asking for all three.
Start with your sun sign
If you want to go deeper on a sign — yours, your partner's, a friend's — our zodiac pages cover traits, strengths, shadow side and compatibility.
Related reading
- Zodiac signs — all twelve signs with traits, compatibility and element breakdowns.
- Compatibility — how each sign pair works in love, friendship and work.
- Numerology — a parallel symbolic system that pairs well with chart work.
While you wait for your chart
A full chart is the planets in detail. These quizzes take the same building blocks — Moon, elements, signs — and reflect them back as a quick personal read.
Frequently asked questions
- What is a birth chart?
- A birth chart (also called a natal chart or horoscope) is a map of where the planets, Sun, and Moon were positioned in the sky at the exact moment and location of your birth. It is divided into twelve houses representing different life areas. Astrologers interpret the combination of planets, signs, and houses to describe personality tendencies, recurring life themes, and timing of significant phases. The birth chart is the foundation of modern Western astrology and is far more detailed than a sun sign reading.
- What is the difference between sun sign, moon sign, and rising sign?
- The Sun sign describes your core identity and conscious self-expression — it changes signs roughly every 30 days. The Moon sign describes your emotional nature and instinctive responses — it changes signs every 2.5 days. The Rising sign (Ascendant) is the zodiac sign rising on the eastern horizon at your birth time — it changes roughly every 2 hours and represents how others perceive you and your social manner. Together, the Big Three give a much richer picture than the Sun sign alone.
- Do I need my exact birth time to calculate a birth chart?
- For a complete chart, yes. The Rising sign and the house system both require the exact time of birth, as the Ascendant changes sign approximately every two hours. Without a birth time, you can still calculate Sun, Moon, and planetary positions for the date and location — but house placements and Ascendant will be missing. If you do not know your birth time, check your birth certificate or hospital records.
- What are the twelve houses in a birth chart?
- The twelve houses divide the sky into sections representing different life domains. House 1: self and first impressions. House 2: money and values. House 3: communication and early learning. House 4: home and family. House 5: creativity and romance. House 6: health and daily routines. House 7: partnerships. House 8: transformation and depth. House 9: philosophy and travel. House 10: career and public reputation. House 11: community and ideals. House 12: the unconscious and what is hidden.
- Is astrology scientifically proven?
- No. The most rigorous scientific tests of astrological claims — including the Shawn Carlson double-blind study published in Nature (1985) and large-scale analyses of sun signs and personality — have not found evidence that birth chart placements predict personality or life outcomes more accurately than chance. Astrology functions well as a symbolic and reflective framework — it gives people vocabulary for complexity and prompts for self-inquiry. This site presents birth chart content as a reflective tool, not a predictive science.
For entertainment and self-reflection purposes only. Astrology is a symbolic language, not a predictive science.