A birth chart (natal chart) maps where the Sun, Moon, and planets were at your exact moment of birth. This free calculator uses your birth date, time, and city to preview your Sun, Moon, and Rising signs without an account. Cosmic provides the complete chart with planets, houses, aspects, and deeper interpretation.
Planetary positions are computed with the VSOP87 planetary theory and historical timezone data from the IANA database. Automated reference tests compare supported calculations with astro.com values using a 0.5° tolerance. The paid Cosmic app supports 10 house systems.
Birth Chart Calculator
Enter your birth date, exact time, and birthplace to calculate your Sun, Moon, and Rising signs free. Your complete chart with planets, houses, and aspects is available in Cosmic.
Instant results · Cancel anytime · Secure checkout via Stripe
Calculate your Big Three free
Enter your birth details to see your Sun, Moon, and Rising signs. No account required.
What you need to calculate your birth chart
Birth Date
Your date of birth determines your Sun sign and planetary positions in the zodiac.
Birth Time
Your exact birth time determines your Rising sign and house placements. Check your birth certificate.
Birth Location
Your birthplace determines the local sidereal time and timezone, which affect house cusps.
What's in your birth chart
Your Big Three: Sun, Moon & Rising
Your Big Three are the foundation of your birth chart. Together they describe your core identity (Sun), emotional nature (Moon), and how others perceive you (Rising).
How accurate is this calculator?
VSOP87
VSOP87 ephemeris
0.5°
Automated test tolerance
10
House systems supported
The app uses the VSOP87 planetary theory and IANA historical timezone data. Automated reference tests compare supported calculations with astro.com values using a 0.5° tolerance.
Frequently Asked Questions
Is this birth chart calculator really free?
Yes. This page calculates your Sun, Moon, and Rising signs free without an account. The complete Cosmic birth chart adds planets, houses, aspects, and deeper interpretation.
What do I need to calculate my birth chart?
Your birth date, birth time, and birth location. The birth time determines your Rising sign and house placements. Without it, you can still get your Sun sign and planetary positions, but the chart will be less precise.
How accurate is this calculator?
The app uses deterministic VSOP87 calculations and IANA historical timezone data. Supported calculations are cross-checked in automated tests against astro.com reference values using a 0.5° tolerance; this is a test threshold, not a promise that every chart value is exact.
What house systems do you support?
We support 10 house systems: Placidus, Whole Sign, Equal, Koch, Campanus, Regiomontanus, Morinus, Porphyry, Alcabitius, and Topocentric. You can switch between them after generating your chart.
What is included in the birth chart?
Your complete chart includes: Sun, Moon, Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto positions with exact degrees. Plus your Rising sign (Ascendant), Midheaven, all 12 house cusps, major aspects between planets, and essential dignities.
How is this different from other astrology apps?
Cosmic Copilot computes charts from the VSOP87 planetary theory rather than simplified lookup tables, supports 10 house systems, and explains why a transit matters instead of offering vague predictions. One subscription — £4.99/month or £39.99/year — covers the full chart, transits, and compatibility tools.
Ready to see your complete birth chart?
Calculate your Big Three free on this page, then create your complete Cosmic birth chart to explore every planet, house, aspect, and interpretation.
Generate my birth chartCancel anytime · Secure checkout via Stripe