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Your Free Birth Chart Calculator
The exact positions of the planets at the moment you were born, drawn from real astronomy — calculated right here in your browser and never sent anywhere.
Everything stays on your device. Your birth details are used for one calculation and stored nowhere — same promise as our calculators everywhere on this site.
How to read your birth chart
The wheel shows the sky as it looked from your birthplace. The outer ring is the zodiac, and when you've given a birth time it's divided at your Ascendant (marked AS) — the sign rising on the eastern horizon the moment you arrived. The planets sit where they truly were, to the arc-minute, and each one links through to what it means in your sign and in its house.
The Ascendant is your outward self — how you come across, your instincts on first meeting. The Midheaven sits at the top of the chart and speaks to your calling and public life. The Moon shows your inner world and how you are when nobody's watching. Those three plus your Sun carry most of the weight; everything else fills in the detail.
Read the tight aspects first. An aspect is the angle between two planets, and the closer it is to exact, the more plainly you'll recognise it in yourself. Anything inside two degrees is usually obvious to the people who know you.
Houses here are equal house — twelve thirty-degree segments counted from the Ascendant. It's the oldest system and the easiest to follow. Placidus is the other one you'll meet, and it divides the sky by time rather than by angle, so it will hand you different house numbers for the same birth. Neither is a mistake. If you've had a chart done elsewhere and the houses disagree, this is why.
If you don't know your birth time
Plenty of people don't. The calculator requires a birth time to produce a chart — when blank it returns an error. Contact us if you need help or to request manual chart generation.
Still exact either way: the Sun, Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. None of them covers more than a degree or two in a day, so their signs hold whatever hour you were born.
The one to watch is the Moon. It travels about thirteen degrees a day — nearly half a sign — so roughly one birthday in three catches it mid-crossing. When that happens the calculator tells you the exact clock time it changed signs, worked out from the ephemeris rather than estimated. Narrow your birth down to morning or evening and you'll have your answer.
The time is usually on your birth certificate. Hospital records and baby books often have it, and sometimes an older relative simply remembers. It's worth the phone call — the rising sign is the piece most people say they recognise most.
What is a birth chart?
A birth chart — a natal chart — is a map of the sky at the moment and place you were born. Astrologers have been drawing them for thousands of years, on the idea that where the Sun, Moon, and planets stood says something about character and the shape of a life. Yours is specific to you: change the hour or move the birthplace and it becomes a different chart.
Most free tools online give you a Sun sign and stop. This one computes the true positions of all ten bodies — Sun, Moon, Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto — to the arc-minute, using the same astronomical mathematics behind professional ephemerides. It also works out which planets were retrograde, which were standing still, how your elements and modalities balance, where your chart piles up, and which phase the Moon was in when you arrived.
One honest note about the outer three. Uranus, Neptune, and Pluto move so slowly that everyone born within several years of you shares their signs. Read those as something about your generation, not about you personally. Any site that sells you Pluto in Scorpio as a private character trait is describing about twelve years of babies.
And what a chart isn't. Nothing here predicts what will happen to you. A chart describes patterns; you're the one living them. Read the parts that make you sit up, and leave the rest — you know your own life better than any calculation does.
Keep going once you have your chart: your birthday reading, the numbers in your name, who fits with your sign on the compatibility page, and what the retrogrades are doing now.
Questions people ask me
Can I get a birth chart without knowing my birth time?
Yes, but part of the chart genuinely can't be calculated. The Ascendant, Midheaven, and all twelve houses depend entirely on the hour, so I leave them out rather than guess. Your Sun, Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto signs stay exact, because none of them moves more than a degree or two in a day.
Why do other free sites give me a rising sign without my birth time?
Because they quietly assume you were born at midday. The rising sign changes roughly every two hours and works through all twelve signs in a day, so a chart built on an assumed noon birth shows the wrong one about eleven times out of twelve — with nothing on the page telling you so.
Can my Moon sign be wrong without a birth time?
It can. The Moon travels about thirteen degrees a day, nearly half a sign, so roughly one birthday in three catches it crossing. When that happens I'll tell you the exact clock time it changed signs. Narrow your birth down to morning or evening and you'll know which one is yours.
Which house system does this use?
Equal house — twelve thirty-degree segments counted from the Ascendant. Placidus is the other one in common use; it divides the sky by time rather than by angle, so it gives different house numbers for the same birth. Neither is wrong, which is why a chart done elsewhere may not match this one.
What does it mean if a planet was retrograde when I was born?
A retrograde planet isn't moving backwards — it only looks that way from here, because Earth is overtaking it. Astrologers read that appearance as energy turned inward: you work that planet out privately before showing it to anyone. A planet that was stationary, turning between forward and backward within a day of your birth, is read as one of the strongest placements a chart can hold.
Why are Uranus, Neptune, and Pluto the same for everyone my age?
Because they crawl. Pluto sits in one sign for twelve to twenty years, so everyone born within several years of you shares that placement. Those three describe a generation, not a person, and I'd rather say so than sell you a shared placement as a private trait.
Is my birth data stored or shared?
No. The whole calculation happens in your browser. Your date, time, and place are used once and never sent to a server, logged, or stored anywhere.