BaZi Calculator: Your Four Pillars, Day Master and Five Elements

BaZi (八字, "eight characters") writes the moment of birth as four pillars, each a Heavenly Stem over an Earthly Branch from the 60-pair sexagenary cycle. The year pillar changes at Start of Spring (立春, about 4 February), not on 1 January or at Chinese New Year, and each month pillar begins at one of the 12 "jie" solar terms, such as Awakening of Insects (惊蛰) around 5 March. The day pillar simply counts days in a 60-day cycle, and the hour pillar covers two-hour blocks starting at 11pm.

The solar-term times were generated with the open-source lunar-javascript library (astronomical calculation) for 1900 to 2100 and checked against the Hong Kong Observatory's 2026 solar-term times. The calculator's results were checked against lunar-javascript's own BaZi engine for 20,000 random Singapore birth times, and against published example charts for Steve Jobs, Barack Obama and Albert Einstein.

Your clock time is converted to the exact moment of birth using Singapore's historical time zones from the IANA time zone database: UTC+7:30 from September 1945 to the end of 1981 (and earlier offsets before that), UTC+8 from 1 January 1982. By default the hour pillar is read from the clock time you enter; switch on solar time to read it from the sun instead, as some practitioners do. Two conventions differ between schools and are left to you: whether 11pm to midnight counts as the next day, and whether hidden stems are counted.

BaZi is a Chinese cultural tradition. This tool shows the chart only: it makes no predictions, and nothing on this page is health, financial or life advice.