Four Pillars & Day Master
See the year, month, day and hour pillars together with their Heavenly Stems, Earthly Branches, hidden stems and the Day Master at the centre of the chart.
YIMATRIX · ONLINE TOOL
BaZi Calculator
Calculate the Four Pillars with transparent birth-time settings, then inspect the Day Master, Five Elements, Ten Gods and luck cycles.
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BaZi · Four Pillars calculator
From birth time to a chart you can actually inspect
YiMatrix separates deterministic chart calculation from optional AI interpretation. Start with the Four Pillars, then inspect the relationships and timing layers behind the reading instead of receiving a one-line horoscope.
Five Elements & Ten Gods
Review element composition and the Ten Gods relationships that connect the other stems and branches to the Day Master.
Luck cycles & annual timing
Move from the natal chart into 10-year Da Yun cycles, annual and monthly timing, with each layer kept beside the original Four Pillars.
Calculation method
The choices that can change a chart stay visible
Birth timezone, historical daylight saving time, longitude, true solar time, Southern Hemisphere handling and the late-Zi-hour convention are recorded as explicit settings. Lunar input includes leap-month selection, and a known BaZi can be used to look for matching dates.
BaZi calculator questions
Can I calculate a BaZi chart without signing in?
Yes. The basic chart can be calculated and inspected in the browser. Signing in is used for cloud profiles, history, intelligent reports and follow-up conversations.
Why can two BaZi calculators produce different charts?
Differences usually come from timezone or daylight-saving data, longitude and true-solar-time correction, the late-Zi-hour rule, or different solar-term boundaries. YiMatrix keeps these choices visible so the result can be checked.
What if the birth time is unknown?
You can still inspect the year, month and day pillars. The hour pillar and interpretations that depend on it will be incomplete, so the result clearly keeps the unknown-time state.