BaZi Four Pillars Calculator

BaZi (八字) maps the year, month, day, and hour of your birth onto the Chinese calendar of elements and animals. At its center is your Day Master — the element that defines you. Used across East Asia for over a thousand years, it reads timing and fortune in a way Western charts don't attempt.

Your birth details
Needed for your Hour Pillar — 4 pillars instead of 3.
The clock offset from UTC where you were born. Leave blank to estimate from longitude.
Used for true solar time correction — the traditional way hour boundaries are judged.

Already know your Western chart? See how your Day Master compares → get your birth chart

Frequently Asked Questions

What is a Day Master?

The Heavenly Stem of your day of birth — one of ten element-polarity combinations (like Yang Fire or Yin Water). In BaZi it represents you; everything else in the chart is read relative to it.

How is this different from the Chinese zodiac?

The zodiac animal is just your Year Pillar's branch — one-eighth of a BaZi chart. Four Pillars adds month, day, and hour for a far more individual reading.

Why does the year boundary matter?

BaZi years begin at Lichun (立春, "Start of Spring", around Feb 4) — not January 1 and not Lunar New Year. We compute the exact solar-term moment from ephemeris data.