Free astrology calculators
Your birth chart, calculated precisely
Real astronomy behind every chart: planet positions checked against NASA JPL Horizons, historical time zones handled for you, and nothing stored.
- No sign-up
- Accurate to arcseconds
- Birth details never stored
Calculators
- Birth chart calculatorFull natal chart: planets, Ascendant, houses and aspects, drawn as a chart wheel.
- Rising sign (Big Three)Sun, Moon and rising signs, plus how much your birth time can be off.
- Moon sign calculatorYour Moon sign with or without a birth time.
- Venus sign calculatorYour Venus sign: love, attraction and values.
- Synastry chartCompare two charts: Sun–Moon, Venus–Mars and every aspect between you.
- Zodiac compatibilityAll 78 sign pairings: how every two signs get along in love, and why.
- What zodiac sign am I?Your Sun sign by birthday, with exact answers for cusp dates.
- Retrograde planets nowEvery planet's status, next retrograde, shadow dates and a date lookup.
- Is Mercury retrograde?Live status, countdown and every date this year and next.
Why Natal Chart Lab
- Accurate positionsWithin about 20 arcseconds of NASA JPL Horizons in our published comparison.
- Birth-time awareWe flag a Moon that changed signs on your birthday, and show how many minutes your birth time can be off before your rising sign changes.
- PrivateCharts are calculated on request and never saved. Share cards show only your signs.
- Open dataEvery retrograde from 1950 to 2050 is free to download and cite.
Astrology is a symbolic and cultural tradition. The planetary positions on this site are calculated with astronomical accuracy; the interpretations describe what astrologers associate with them and are not scientifically validated predictions about personality, relationships or the future.