Birth chart calculator: see your natal chart

Which parts of yourself haven't you fully figured out yet?

Your birth chart is a map of who you are, drawn from the sky on the day you were born. It shows how you love, what really drives you, the kind of work where you shine, and why the same situations keep showing up in your life.

When were you born?

Your date tells us which sign the Sun and each planet were in. It's the first piece of the calculation and isn't used for anything else.

What time were you born?

Your birth time determines your rising sign (also called your Ascendant), your houses, and your Midheaven. It's on your birth certificate, which you can request from your state's vital records office.

Where were you born?

Start typing your city and pick it from the list. That's how we get the exact coordinates of where you were born.

We set the time zone for your date and place automatically, including any historical changes.

Your birth chart is ready.

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Your birth chart

This first look is a sample of how we read a chart.

If you want to go deeper, our full reading goes through every part of your chart and what it means for your life.

Your full birth chart reading

what your chart says when it's read as a whole

How you think, love, and fight. Where your life plays out, the pattern you keep repeating, and your core wound. Same positions, more layers.

Explore the full reading

What is a birth chart or natal chart?

Birth chart and natal chart are two names for the same thing. A birth chart is a map of the sky at the exact moment you were born, as seen from your birthplace. It records where the Sun, the Moon, and the planets were along the circle of the zodiac, and which part of that circle was rising over the eastern horizon at that moment.

It's calculated from three details: your birth date, time, and place. Your date places the planets. Your time sets your rising sign, also called your Ascendant, and your twelve houses, one for each area of your life. Your place decides what the sky looked like from where you were born. Two people born on the same day in different cities share almost every planet, but not a single house.

What this calculator shows you

  • All ten planets, from the Sun to Pluto, with their sign, degree, and house.
  • Chiron, Black Moon Lilith, and the North and South Nodes, which many quick calculators leave out. Chiron is about a wound that can become your way of supporting others, and Lilith about the part of you that won't be tamed. The North Node is about what feels hard and moves you forward, and the South Node about what you've mastered and the comfort you fall back on.
  • All twelve houses in the Placidus house system, with the exact degree of each cusp, the line where a house begins.
  • The aspects, the angles the planets form with each other, each with its orb. The orb is how many degrees an aspect is from exact, and the fewer there are, the more it shows.
  • Your lunar phase, how the Moon looked on the day you were born, depending on where it was relative to the Sun.
  • Any retrograde planets in your chart, each one marked. Retrograde means that, seen from Earth, the planet seemed to move backward when you were born.

Everything is calculated with NASA ephemeris data. We also use the time zone your city was on the day you were born. Your results appear on screen in a few seconds. No card needed, no account to create.

How to read your results

Every position reads in three layers, and it's easier than it looks once you separate them.

  • The planet is the what. It tells you which part of you is involved. Venus is about how you love and what you value, Mars about how you go after what you want and what makes you angry, and Mercury about how you think and communicate.
  • The sign is the how. It's the style that part of you expresses itself in, not what it does.
  • The house is the where. It's the area of your life where it plays out: your work, your relationships, your home, or your studies.

Aspects are the angles between two planets, and they describe how the two get along. A conjunction blends them, a trine or a sextile gets them to agree, and a square or an opposition gets them arguing. None of them is good or bad on its own, and tension is often what gets things moving.

If you've never looked at a chart before, start with three pieces, known as your big three. Your Sun is who you are at your core and what gives you energy. Your Moon is what you need to feel safe. Your rising sign is how you come across and how you approach new things. With those three, you already have the backbone of your chart.

What this calculator doesn't do

It gives you the data, not the meaning. It doesn't predict events, tell you who you should be with, or interpret your whole chart. It also doesn't calculate transits (when a moving planet touches your chart) or your solar return (the chart for your year from birthday to birthday). Both build on your birth chart, but they're separate calculations.

If you've seen your positions and want to know what they mean, that's what our birth chart reading is for: an interpretation built on this same calculation and reviewed by astrologers.

Other free calculators

If you already have your chart, there are three more calculations you can run here for free. The synastry calculator compares your birth chart with someone else's. The astrocartography calculator maps your planetary lines across the world. The solar return calculator pins down the exact minute your personal new year begins, close to your birthday, and tells you the tone that year brings.

And if you only want one piece, two shortcuts take you straight to it: calculate your rising sign and calculate your Moon sign.

Frequently asked questions

Can I calculate my birth chart without knowing my birth time?

Yes, but it comes out incomplete. Without a birth time there's no rising sign (also called your Ascendant) and no houses, the twelve areas of life your chart is divided into. That's because the rising sign changes about every two hours. We can still calculate the planets, with one caveat: the Moon moves 12° to 15° a day, so it may have changed signs during the day you were born. If you don't know your birth time, it's usually on your birth certificate, or you can request it from the vital records office in the state where you were born.

Which house system do you use?

We use Placidus, the most widely used house system in modern Western astrology and the same one behind our readings. It divides your chart into twelve houses, one for each area of your life, based on how long each degree of the zodiac takes to rise over the horizon where you were born. That's why two people born on the same day in different cities have different houses.

Where do the planetary positions come from?

They come from Swiss Ephemeris, an astronomical calculation library derived from NASA ephemeris data. An ephemeris is a set of tables that tracks where each planet is at any moment. It's the same calculation behind our paid readings, not a scaled-down version. We also apply the time zone your city was on that exact day, including historical daylight saving time. Missing that is the most common mistake people make when they calculate a chart by hand.

Do you store my birth details?

No. We don't store them in any database or link them to an account. Your birth date, time, and place go to our calculation server and are used to work out the planetary positions. You don't need to create an account or enter a card to use the calculator.

Is a birth chart the same as a natal chart?

Yes, they're the same thing. The term natal chart is a little more technical, while birth chart is the one you'll hear most in everyday conversation. You may also see astrology chart or natal horoscope. They all describe the same map: the sky as seen from your birthplace at the exact moment you were born.

Why is my rising sign different on another website?

It almost always comes down to the birth time or the time zone. Your Ascendant is the exact degree that was rising on the eastern horizon when you were born, and a difference of just 15 minutes moves it by about 4°. If it sat near the end of a sign, that's enough to change your rising sign. The other common cause is historical daylight saving time: many calculators use your city's current time zone instead of the one in effect on the day you were born.

How is this different from a reading?

The calculator gives you the positions: where each planet was, which house it falls in (the area of your life where it plays out), and which aspects it forms with the other planets (the angles between them). That's the data, and it's free. A reading is the interpretation of that data, built for your specific chart from this same calculation and reviewed by astrologers.