About this tool

birthchart.io offers free birth chart and astrology tools in English and Simplified Chinese. Explore your natal chart, rising sign, Moon sign, transits, synastry, Saturn return and solar return, or check today’s Moon phase and Chinese zodiac. No account is required. Calculations run in your browser, with optional local memory for birth details. Published methods and limitations help explain the results. Astrological interpretations are symbolic material for reflection, not scientific predictions.