Birth Chart Calculator - Free Natal Chart Calculator Online
Free birth chart calculator with planets, houses, aspects and a printable chart wheel.
Tool Interface
Your Big Three
Birth Chart Wheel
Planets
Houses
Major Aspects
Frequently Asked Questions
What is a birth chart? +−
A birth chart, also called a natal chart, is a map of the sky at the exact moment and place you were born. It shows where the Sun, Moon, and planets were among the twelve zodiac signs and houses, which astrologers read as a portrait of personality traits and life themes.
Why does the calculator ask for my birth time? +−
Your birth time sets the Ascendant (rising sign) and the house placements. Planets move through signs slowly, so sign positions stay correct without a time, but houses and the Ascendant need an accurate birth time. If you do not know yours, tick the 'I do not know my birth time' option: the chart is then calculated for 12:00 noon, and the Rising sign, houses, and Moon sign may be off.
What does my Moon sign mean? +−
While your Sun sign describes your core identity, your Moon sign describes your emotional nature: how you react under stress, what makes you feel secure, and how you recharge. Many astrologers treat the Moon sign as equally important as the Sun sign when reading a chart.
How accurate is this birth chart calculator? +−
Planetary positions are computed in your browser from open-source ephemeris data using standard astronomical formulas, so sign and house placements match professional chart software. The written interpretations are simplified for beginners and intended for self-reflection and entertainment.
Is my birth data kept private? +−
Yes. The entire calculation runs locally in your browser. Your birth date, time, and place are never uploaded, stored, or sent to any server.
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About This Tool
About This Tool
The Birth Chart Calculator creates your personal natal chart from your birth date, birth time and birth location. It computes real planetary positions with open-source ephemeris data, right in your browser: your Sun sign, Moon sign and Rising sign, all ten planets with retrograde status, the twelve house cusps and the major aspects between planets. Your data never leaves your device.
Key Features
- Big Three summary: Sun, Moon and Rising signs with exact degrees
- Visual birth chart wheel with zodiac ring, houses and planet glyphs
- Download your chart wheel as a PNG image
- Full planet table: sign, degree, house placement and retrograde status
- Twelve house cusps and all major aspects with orbs
- Seven house systems: Placidus, Whole Sign, Equal House, Koch, Regiomontanus, Campanus, Topocentric
- Tropical or Sidereal zodiac
- Works without birth time too, with a clear accuracy note
- 100 percent client-side: no signup, no upload, complete privacy
How to Use
- Enter your birth date and birth time in local time. If you do not know the time, tick the checkbox.
- Pick your birth city from the list, or choose Custom coordinates and enter latitude and longitude.
- Select a house system and zodiac if you want something other than the defaults.
- Click Calculate Birth Chart and explore your Big Three, chart wheel, planets, houses and aspects.
- Download the wheel as PNG or copy a text summary to share.
Note: exact birth time is needed for an accurate Rising sign, house cusps and Moon position. Charts are computed for entertainment and self-reflection.