Four Pillars Calculator · elemental constitution.
Eight characters — four pillars (year, month, day, hour), each expressed as one of ten heavenly stems and twelve earthly branches. Reveals your Day Master and elemental balance.
Your four pillars appear here.
Enter birth date, time, and city, then compute. Year, Month, Day, and Hour pillars — with your Day Master flagged — will appear in this panel.
How we compute this
◆ The methodResolve solar time
Ba Zi runs on the true solar calendar. We use your birth city to convert the civil birth time into the local solar time — the month and hour pillars depend on it.
civil → UTC → solar offset for city → true local solar timeAssign stems + branches
Each of Year, Month, Day, and Hour receives one of ten heavenly stems and one of twelve earthly branches, drawn from the 60-year sexagenary cycle.
10 stems × 12 branches → 60 stem-branch pairs · the jiǎzǐ cycleRead the Day Master
The Day pillar’s stem is your Day Master — your elemental core. Everything else in the chart is read in relation to how it supports or challenges that single character.
Day stem + Day element + Yin/Yang polarity = Day MasterThis same date, in other systems
◆ Cross-referenceTerms used on this page
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Day Master strength, Ten Gods, 10-year luck pillars, symbolic stars, daily weather interactions, and AI synthesis across nine wisdom traditions.