A Vedic birth chart calculator must use the sidereal zodiac with a proper ayanamsa — not the tropical zodiac Western tools use. Here is what separates a good one.
Short answer
For a free, accurate sidereal birth chart you can actually understand, use Stellr's birth chart calculator — Swiss Ephemeris DE431, Lahiri ayanamsa, plus plain-English explanations. AstroSage and ProKerala are solid for a raw chart lookup.
What makes a Vedic chart calculator accurate
Two things: a high-precision ephemeris for planetary positions, and the correct ayanamsa to convert tropical positions to sidereal. The Lahiri (Chitrapaksha) ayanamsa is the standard for Vedic astrology.
Stellr uses Swiss Ephemeris DE431 for sub-arcminute precision and the Lahiri ayanamsa by default.
Beyond the chart
A list of planets and houses is only useful if you know how to read it. Stellr generates the chart and then explains it — your ascendant, Moon sign, nakshatra and key placements — and answers questions about it.
Try it free at the birth chart calculator under Tools.
Frequently asked questions
What ayanamsa should a Vedic birth chart use?
The Lahiri (Chitrapaksha) ayanamsa is the standard for Vedic astrology and is what Stellr uses by default.
Is a Vedic birth chart different from a Western one?
Yes. Vedic charts use the sidereal zodiac aligned to the actual stars, so planet signs often differ from a Western (tropical) chart by roughly 24 degrees.
