Astrology
Your birth chart, one placement at a time
Nine free calculators built on the same tested engine: the full chart with houses and aspects, your big three, and single placements when you want to go deeper. Every result shows the time zone and offset it used, so you can check it. Tradition and entertainment, never a verdict.
Every astrology calculator
Birth Chart Calculator
Sun, Moon and rising sign, every planet in its sign and house, with a chart wheel.
Date, time and place
Sun, Moon and Rising Calculator
Your big three in one step: core identity, emotional needs and first impression.
Date, time and place
Rising Sign Calculator
The sign rising on the eastern horizon when you were born. Needs your birth time.
Date, time and place
Moon Sign Calculator
Your Moon sign, with both options shown if the Moon changed sign on your birthday.
Date and place
Venus Sign Calculator
How astrology describes the way you love, value and enjoy, by the sign of Venus.
Date and place
Mars Sign Calculator
Drive, desire and how you act on them, read through the sign of Mars.
Date and place
Saturn Return Calculator
The exact dates Saturn comes back to where it stood when you were born.
Date and place
North Node Calculator
The lunar node traditionally read as a direction of growth, mean and true.
Date and place
Synastry Chart
Two birth charts side by side: the aspects between them, a bi-wheel and house overlays.
Two birth dates, times and places
Start here
The big three
Astrologers usually read three placements first. Together they are a short portrait: how you see yourself, what you need, and the manner you bring to a room.
Sun sign
Who you are at the core
Set by the Sun's position on your birth date. Astrologers read it as identity and sense of purpose. It changes about once a month, so it is the sign most people already know.
Find mine
Moon sign
What you need
Set by the Moon's position, which changes sign about every 2.3 days. Traditionally read as emotional needs and what comforts you. Your date and place are usually enough.
Find mine
Rising sign
How you come across
The sign on the eastern horizon at your birth time and place, also called the Ascendant. It changes about every two hours, so it needs your birth time.
Find mine
Read the longer explainer: Sun, Moon and rising signs.
Rising sign meanings
Each Ascendant as older texts and today's astrologers describe it, with how long it takes to rise at your latitude.
Moon sign meanings
The natal Moon in each sign: Alan Leo's 1899 descriptions next to how astrologers read it now.
Venus sign meanings
What each Venus sign is said to value, and which Sun signs can carry it, from our count of every day from 1950 to 2009.
Mars sign meanings
Mars in each sign: its traditional dignity, Alan Leo's 1903 description, how astrologers read it now, and every stay of Mars in the sign from 1960 to 2012.
North Node sign meanings
The North Node in each sign with the South Node opposite, and the dates the node spent there from 1930 to 2030.
The North Node by house
The node in each of the twelve houses with the South Node in the house opposite, and how much the house depends on the birth time in our sample of 21,025 charts.
- North Node in the 1st house
- North Node in the 2nd house
- North Node in the 3rd house
- North Node in the 4th house
- North Node in the 5th house
- North Node in the 6th house
- North Node in the 7th house
- North Node in the 8th house
- North Node in the 9th house
- North Node in the 10th house
- North Node in the 11th house
- North Node in the 12th house
The twelve houses, one by one
What each house is read for in older texts and today, how often it is empty in our sample of 21,025 charts, and how to find yours.
The North Node in synastry
One person's Sun, Moon, Venus, Mars, Saturn, Pluto, Ascendant or Descendant on another person's North Node: what guides say, and how often it happens between random pairs of charts.
Astrology guides
Longer reads on how a chart is put together and how astrologers read it, each with its sources and our own measurements.
How to Read a Birth Chart, Step by Step
How to read a birth chart in eight steps: the big three, planets, signs, houses and aspects, with a worked example chart and honest limits.
Read the guide
Saturn Return: When Yours Falls and What It Means
What a Saturn return is, the age it falls (we measured 28.4 to 29.9 years), why some people get three passes, and how astrologers read it, without the fear.
Read the guide
Sun, Moon and Rising: Your Big Three, Explained
What your Sun, Moon and rising signs are, what astrology says each one describes, and how long a sign rises at your latitude, with worked examples.
Read the guide
Synastry: What Two Birth Charts Say About Each Other
What synastry is, the five aspects astrologers read between two birth charts, house overlays, why birth times matter, and what synastry cannot tell you.
Read the guide
The 12 Houses in Astrology, Explained
The 12 houses in astrology, one by one: what each stands for in tradition, how Placidus and Whole Sign differ, and how to find your own.
Read the guide
Midheaven (MC): What It Is and How to Find Yours
What the Midheaven (MC) is, why it is not always your 10th house, what astrologers link it with in each sign, and how to find yours from a birth time.
Read the guide
Your North Node: How to Find It and What It Means
What the North Node is, mean node versus true node, a lookup table of North Node signs from 1930 to 2030, and what astrologers read into it, sign by sign.
Read the guide
The North Node Symbol
The two node glyphs, what they are called, where they come from and how to type or copy them.
Read the guide
How these charts are calculated
Planet positions come from an astronomical ephemeris accurate to about one arcminute, and we tested the results against the Swiss Ephemeris and NASA's JPL Horizons on charts from 1879 to 2024, in both hemispheres. The birth time is converted to Universal Time with the historical time zone rules of your birthplace, including daylight saving and wartime changes, and local mean time before standard time existed. Signs use the tropical zodiac; houses default to Placidus. Every choice is written up on our methodology page.
What to read next
If the chart is new to you, start with how to read a birth chart, then the twelve houses. To compare two charts, the guide to synastry explains the aspects and overlays before you open the calculator. On the numerology side, the numerology calculator reads the same birth date as your Sun sign.
Questions people ask
Your big three are your Sun sign, your Moon sign and your rising sign. The Sun sign comes from your birth date, the Moon sign from your date and place, and the rising sign from your exact birth time and place. The Sun, Moon and rising calculator gives all three at once and says what each one means.
Enter your birth date, time and place into the birth chart calculator. It computes every planet's position from an astronomical ephemeris, applies the historical time zone of your birthplace, and draws the wheel with houses and aspects. Everything runs in your browser and nothing is stored.
A birth chart is a map of where the Sun, Moon and planets stood, seen from your birthplace, at the moment you were born. Astrologers read each placement as a description: the Sun as identity, the Moon as emotional needs, the rising sign as outward manner, and every other planet in its sign and house as a different area of life. We offer those readings for reflection and entertainment, not as predictions.
You need your birth date and place, and sometimes your birth time. The Moon spends about 2.3 days in each sign, so on most dates the date alone settles it. On the days it changed sign, the Moon sign calculator shows both signs and the local time of the change so you can tell which is yours.
By hand you convert your birth time to Universal Time, work out the local sidereal time for your longitude, then use your latitude and the obliquity of the ecliptic to find the degree of the zodiac rising in the east. It is several pages of trigonometry, which is why astrologers used tables of houses. Our rising sign calculator does the same computation and shows the offset and sidereal time it used.
Calculate both birth charts, then compare every planet in one chart with every planet in the other, noting the aspects (angles) between them and where each person's planets fall in the other's houses. The synastry chart calculator does this and draws a bi-wheel; our guide to synastry explains how astrologers read the result.
Find where Saturn stood in your birth chart, then find the dates it comes back to that exact degree, about 29.4 years later and again around 59. Because Saturn turns retrograde, the return often has three passes. The Saturn return calculator lists every pass with its date.
The North Node is the point where the Moon's orbit crosses the Sun's path heading north. It is not a planet but a calculated point, and astrologers traditionally read it as a direction of growth, with the South Node opposite as familiar ground. The North Node calculator gives both the mean and the true node.