Big Three
Start with the Sun, Moon, and rising sign: direction, emotional baseline, and how you meet the world.
Your whole sky at birth
Free Birth Chart Calculator
A birth chart is a map of the sky for the moment and place you were born. Calculate your Big Three, planetary placements, houses, and strongest aspects from real ephemeris data—then explore the wheel yourself.
- Real ephemeris
- No signup
- Nothing saved
Free · private · no signup
Draw your natal chart
Use your recorded birth time for an accurate rising sign and houses. If you do not know it, you can still calculate the planets by sign.
Calculation accuracy
What makes a birth chart accurate
The planets are calculated for an exact moment, while the Ascendant and houses also depend on the birthplace and local time. A wrong time zone or guessed clock time can shift the entire house structure.
This calculator uses the same ephemeris as the full app. The anonymous calculation is not written to our database; signup is optional and comes only after you see the result.
See our calculation methodology →Read the result
How to start reading the wheel
Planets in signs
Each planet names a function; its sign describes the style through which that function operates.
Houses
Houses place chart themes into life areas. They require a reliable birth time and location.
Aspects
Angles between planets show which drives cooperate, combine, or create productive friction.
Keep exploring
More free calculators
Clear answers
Free Birth Chart Calculator FAQ
What is a birth chart?
A birth chart, or natal chart, maps the zodiac positions of the Sun, Moon, planets, angles, and houses for your birth moment and place.
Do I need an exact birth time?
You can calculate planetary signs without one, but an exact time is needed for a dependable rising sign, house cusps, and placements by house.
What are the Big Three?
The Big Three are the Sun sign, Moon sign, and rising sign. They are a useful entry point, but they do not replace the rest of the chart.
Is this a tropical or sidereal chart?
This public calculator uses the tropical zodiac and the same default chart settings as The Astro Diary.
Are my birth details saved?
No. This anonymous calculation is not stored in the app database. Details are kept in the browser tab only if you choose to continue to signup.
See your real pattern first