A full set of free astrology calculators and chart tools, powered by Swiss Ephemeris astronomy. No account needed — browse by theme and pick one to explore.
Your Core Signs
The placements most readings start from — the signs that describe who you are.
- Free Birth Chart Calculator — Free birth chart calculator. Enter your birth date, time, and city to see your natal planetary placements — Swiss Ephemeris accuracy, no sign-up.
- Big Three Calculator — Find your Big Three free — your Sun, Moon, and rising signs in one place. Enter your birth date, time, and city for your core astrological trio.
- Moon Sign Calculator — Find your Moon sign free. Enter your birth date to discover the sign your Moon was in — the seat of your emotional instincts and inner world.
- Rising Sign — Find your rising sign (ascendant) free. Enter your birth date, exact time, and city to discover the sign rising on your eastern horizon at birth.
Charts & Astronomy
Live planetary data and astronomer-grade tools, powered by Swiss Ephemeris.
- Current Planets — See where the planets are right now by sign and degree. A free, live snapshot of the current sky on real Swiss Ephemeris astronomy, no sign-up.
- Ephemeris Calculator — Generate a free ephemeris table of planet positions across any date range, with sign, degree, and retrograde for each day. Swiss Ephemeris accuracy, no sign-up.
- Moon Phase Calculator — Find the Moon phase for any date, from new and full to quarter, crescent, and gibbous, with illumination percent and the Moon sign. Free, accurate astronomy.
- Rodden Rating — Find out how reliable your birth time is with the Rodden Rating system. See whether your Ascendant, houses, and Moon can be trusted, free and with no sign-up.
Timing & Forecast
How the sky shifts across your days and the year ahead.
- Energy Timeline — View a month-by-month curve of how active your transits are, with the themes behind each peak.
- Electional Astrology — See a free day-by-day view of the sky ahead: Moon phase, Moon sign, and the balance of supportive versus challenging aspects, as a timing reference for your own planning. Not a prediction.
- Solar Return Calculator — Free solar return calculator. Find the exact moment the Sun returns to its birth position each year and see your birthday chart. Real astronomy, no sign-up.
- Saturn Return Calculator — Find when Saturn returns to its birth position — the timing of a major life-cycle chapter.
Relationships
Compare two charts and explore the connection between them.
- Synastry Calculator — Free synastry calculator. Compare two birth charts to see the aspects between them, from Sun and Moon to Venus and Mars. Real astronomy, no sign-up.
- Composite Chart Calculator — Free composite chart calculator. Merge two birth charts into one midpoint chart that represents the relationship itself. Real astronomy, no sign-up.
Places & Discovery
Explore your chart on the world map and among familiar faces.
- Astrocartography Map — Free astrocartography map. See where each planet was rising, setting, culminating or at the lower meridian when you were born, drawn across a world map. Real Swiss Ephemeris astronomy, no sign-up.
- Celebrity Astro Twins — Find out which famous figures share your Sun sign. Enter your birth month and day to see your celebrity astro twins, grouped by zodiac sign and element. Free, no sign-up.