A professional classical natal chart calculator. Enter your birth date, time, and place to see your planets, houses, essential dignities, Almuten Figuris, antiscia, Hayyiz, and aspect patterns — with a choice of 5 house systems.
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This calculator reads the sky at the moment of birth using classical (Hellenistic and medieval) astrological methods. Below, we unpack the reasoning behind the techniques shown in the results panel.
Whole Sign is the oldest and simplest system in the Hellenistic tradition: the entire sign of the Ascendant is the 1st house, the next sign the 2nd house, and so on; every house equals exactly one sign, leaving almost no room for calculation error. Placidus, developed in the 17th century, is the most widely used system in modern Western astrology; it's based on a temporal (hourly-motion) division, though it can distort mathematically at high latitudes (above 60°). Regiomontanus is the system preferred in classical horary astrology; Equal House uses equal 30° segments from the Ascendant, the simplest modern alternative. Alcabitius was the dominant system in medieval Europe before Lilly, and is based on a semi-arc division.
Which should you choose? If you're working with Hellenistic/classical techniques (dignities, Almuten Figuris, profection), Whole Sign is preferred; for modern natal interpretation, Placidus is standard. This calculator supports all five, so you can compare them on the same birth data.
In classical astrology, a planet's "strength" isn't a subjective impression, it's a calculable score. Rulership (being in its own sign) gives +5, exaltation +4, triplicity +3/+2, bound (term) +2, and face (decan) +1. At the opposite end, fall gives -4 and detriment -5, weakening the planet. The sum of these scores shows how much a planet is "in its own element and strong" in the chart.
This calculator's Almuten Figuris section sums the total dignity scores of the five vital points (the Ascendant, Sun, Moon, Part of Fortune, and the syzygy) for every classical planet, then adds the day's and hour's lord bonuses (+7/+6, following Ibn Ezra's method); the planet with the highest score is read as the one ruling the native's fundamental nature.
Classical astrology works with the seven visible "planets": the Sun, Moon, Mercury, Venus, Mars, Jupiter, and Saturn. Uranus (1781), Neptune (1846), and Pluto (1930) were discovered by telescope and were never incorporated into the classical dignity system (rulership, exaltation, sect), which is why they don't appear in the dignities table. This calculator's Classical/Modern toggle lets you narrow the results panel to the system you want: Classical 7 for Hellenistic techniques, Modern 10 for a contemporary psychological approach.
The techniques this calculator applies come directly from classical texts: the Tetrabiblos (Ptolemy, 2nd century CE) codifies the foundational concepts of dignity and sect; the Anthologiae (Vettius Valens, 2nd century CE) demonstrates timing techniques through dozens of example charts; the Liber Astronomiae (Guido Bonatti, 13th century) offers a medieval synthesis; and Christian Astrology (William Lilly, 1647) is the masterwork of English-language classical astrology, whose dignity-scoring and Almuten Figuris method this calculator largely follows.
This free natal chart (birth chart) calculator is built on a modern software foundation using the methods of classical (Hellenistic and medieval) astrology. The calculation engine relies on NASA JPL ephemeris data via the astronomy-engine library. Techniques such as dignities, antiscia, Almuten Figuris, Cazimi, and Hayyiz are applied directly from classical sources:
The developer of this tool and the person responsible for interpreting classical texts, Şira Nur Uysal, is a classical astrology teacher and consultant. She teaches a free Introduction to Horary course, along with programs on profection timing, synastry/composite, and mundane astrology. For more, visit our education, consultation, and astrology glossary pages. To start interpreting your chart, lay the foundation with our what is a natal chart guide, then move on to topic-focused reads like career indicators and marriage indicators, or dig into the calculation itself with our manual chart calculation guide. All calculations run locally in your browser; your birth data is never sent to any server.
Common questions about birth chart calculation and classical techniques
A birth chart (natal chart) is a map of the sky at the exact moment and place a person was born. To calculate it you need the birth date, the exact time (ideally to the minute), and the birth city. Latitude, longitude, and the time zone in effect at the moment of birth are derived automatically from the city. The more precise the time, the more accurate the Ascendant (ASC) and house cusps; an hour's difference can shift the ASC by roughly 15°.
Yes, it's completely free. You can use this free natal chart calculator without registering, with no usage limits. All calculations run locally in your browser; your birth data is never sent to any server and no fee is ever charged.
Whole Sign is the oldest Hellenistic system: the entire sign of the Ascendant is the 1st house, and every house equals exactly one sign, simple and error-free. Placidus is the standard in modern Western astrology, based on a temporal division; it distorts at high latitudes. Alcabitius was the medieval tradition's preference. Regiomontanus is used for classical horary, and Equal House divides the chart into equal 30° segments from the Ascendant. If you're working with classical (Hellenistic) techniques, choose Whole Sign; for modern interpretation, Placidus is preferred.
Almuten Figuris is one of classical astrology's key techniques. It sums the total dignity (rulership, exaltation, triplicity, bound, face) scores of the five vital points in the chart (the Ascendant, Sun, Moon, Part of Fortune, and the prenatal New/Full Moon degree known as the Syzygy) for every planet, then adds Ibn Ezra's day-lord (+7) and hour-lord (+6) bonuses. The planet with the highest score is read as the one "ruling the native's fundamental nature." It can differ from the lord of the Ascendant, and points to the chart's primary guiding force.
Antiscia is the mirror reflection across the Cancer-Capricorn axis (the summer and winter solstice points). Two points that share the same day length are in an antiscia relationship, for example 10° Aries mirrors to 20° Virgo. In classical astrology, when two planets sit at each other's antiscia point, it's treated as a "silent connection", an interaction even without a formal aspect. Lilly and Bonatti use it frequently in horary; in a natal chart it points to hidden talents and implicit connections.
A planet's proximity to the Sun defines three classical states: Cazimi (≤17 arcminutes, "in the heart of the Sun") makes the planet exceptionally strong. Combust (between 17′ and 8°30′, "burnt") weakens the planet under the Sun's glare, robbing it of its power to act, a strong indicator of weakness in classical horary. Under the Beams (between 8°30′ and 17°) isn't as weakened as combustion, but the planet remains obscured. Bonatti compares this to the difference between standing in the king's presence versus being seen only from a distance.
Without a time, the planets' sign placements and the aspects between them will still be accurate, these change very little from hour to hour. But the Ascendant, house cusps, and house rulers depend critically on the birth time; a one-hour difference can shift the ASC by roughly 15°.
The right solution is rectification: the classical technique of working backward through your life events (a move, a marriage, a loss, a career change, a birth, etc.) along the ecliptic to pin down your birth time to the minute. This is a professional consulting service, see the Rectification Consultation → page for details and booking.
For a temporary workaround, you can enter 12:00 and use a solar chart approach to read planetary positions and aspects only; however, reliable interpretation of the houses and Ascendant is not possible without rectification.