Bazi Calculator

Bazi, or "Four Pillars of Destiny," is a classical Chinese astrological system dating back over 1,500 years. It maps your birth moment (year, month, day, hour) to eight Chinese characters — two characters per pillar — revealing your constitutional strengths, weaknesses, and life trajectory. Unlike Western astrology's focus on personality, Bazi addresses destiny, capacity, and life's major cycles.

The Year Pillar derives from your birth year's position in the 60-year cycle. The Month Pillar is determined by the solar term you were born into (not the Western calendar month) — solar terms mark the Sun's position at 15° intervals, shifting 2-3 days each year. The Day Pillar is calculated using astronomical Julian Date formulas. The Hour Pillar requires your local solar time, accounting for timezone and daylight saving. All calculations use classical Chinese stem-branch cycling (Heavenly Stems repeat every 10 years; Earthly Branches every 12 years).

The Day Master is the Heavenly Stem of your Day Pillar — it is your core self, the deepest layer of your personality and constitution. Its strength or weakness relative to the other seven characters reveals your natural resilience, assertiveness, or need for support. A strong Day Master tends toward independence; a weak one toward collaboration. A balanced Day Master embodies flexibility. The Day Master is considered the most important character in a Bazi reading.

Luck Pillars are ten-year periods of your life, each governed by a Heavenly Stem and Earthly Branch. Your first Luck Pillar typically begins at age 3 (or age 1, depending on the school of thought). Each decade activates specific elements and animals, bringing distinct themes, opportunities, and challenges. A favorable Luck Pillar reinforces your chart; an unfavorable one creates obstacles. Skilled Bazi practitioners use Luck Pillars to forecast major life transitions and advise on timing.

This calculator uses classical Bazi algorithms for solar term detection (Meeus Ch25 for the Sun's longitude, Newton-Raphson iteration for exact solar term dates) and accounts for your timezone and daylight saving time. The accuracy of your chart depends on the accuracy of your birth data: time should be within 2 minutes, and location within 50km. Birth certificates in most countries record times to the nearest minute. If your exact time is unknown, a noon default is used, which reduces accuracy. For the most precise reading, consult a professional Bazi master in person.