Free Birth Chart Calculator — Placidus Natal Astrology
Your birth chart, calculated with real astronomical precision.
Enter your birth date, time, and place, and this tool casts your full natal chart: every planet's exact sign and degree, all twelve houses under the Placidus system, and every aspect between your planets, computed with the same Swiss Ephemeris precision used throughout OracleSanctum. See essential and accidental dignity for each planet, then go deeper with a complete AI-guided reading whenever you're ready.
No question required. Just your birth details.
Chart generation is free and unlimited. No account required to start.
See What Your AI Judgement Looks Like
See a sample of the detailed analysis, reasoning, and final verdict you'll receive.
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 records where every planet sat against the zodiac, which of the twelve houses each one fell into, and the angles — the aspects — each planet made to the others. Because the sky is always in motion, that arrangement is unique to your birth moment, and traditional astrology reads it as a portrait of temperament, tendencies, and the areas of life each house governs.
This calculator uses the Placidus house system by default — the most widely used house division in modern Western astrology — and computes every position from the Swiss Ephemeris, the same astronomical engine used by professional astrology software. You can switch to Regiomontanus, Whole Sign, Equal, and other systems in chart settings if you prefer a different tradition.
What this tool shows you
Full Planetary Positions
Sun through Saturn by default, with Uranus, Neptune, and Pluto available as an option, each placed to the exact degree and minute.
All Twelve Houses
Placidus by default, with a full set of alternate house systems available if you want to compare.
Every Aspect
Conjunctions, sextiles, squares, trines, and oppositions between your planets, with adjustable orb.
Essential & Accidental Dignity
The traditional strength tables — rulership, exaltation, triplicity, term, and face, alongside angularity and other accidental factors — applied to your own chart.
Frequently Asked Questions
Do I need an exact birth time?
For the most accurate houses and Ascendant, yes — birth time genuinely matters, since the houses and the Moon's precise degree shift as the sky turns. If you don't know your exact time, a placeholder like noon still gives you correct planetary signs and degrees; only the house cusps and Ascendant will be approximate.
Why does this default to Placidus instead of another house system?
Placidus is the most commonly used house system in contemporary Western natal astrology, so it's the sensible default for a general birth-chart tool. It's a genuinely different choice from OracleSanctum's horary tool, which defaults to Regiomontanus — the house system traditional horary practice has historically favored. Both systems, and several others, are available in this tool's chart settings.
How is this different from OracleSanctum's horary tool?
This tool and the horary chart tool share the same underlying calculation engine, but they're built for different purposes. Horary casts a chart for the moment a specific question is asked, and judges that one question. This tool casts a natal chart for a birth moment, with no question involved, and reads the whole chart as a standing portrait rather than an answer to one thing.
Does OracleSanctum offer KP (Krishnamurti Paddhati) astrology too?
Yes — KP birth chart reading and KP horary are separate tools, built on the sidereal zodiac with the Krishnamurti ayanamsa and stellar sub-lord theory, which is a genuinely different tradition from the tropical Western astrology this page uses.
For entertainment and educational purposes only. Results are interpretations, not predictions, medical guidance, or financial advice. Not a substitute for professional advice. OracleSanctum provides content for academic study and personal reflection only. These tools and interpretations examine historical traditions as cultural artifacts. No predictions, fortune-telling, or professional advice are provided.