Free Saju Calculator — BaZi & Four Pillars of Destiny
Free Saju (BaZi / Four Pillars) calculator. Enter your birth date, time, and place to calculate your Four Pillars chart and Day Master — corrected to true solar time.
Also called a BaZi (八字) chart in Chinese astrology — how they compare →
A free Four Pillars (BaZi) calculator — with true-solar-time accuracy
Your sun sign is one of just twelve. Your Saju chart is built from the exact year, month, day, and hour you were born — eight characters, corrected to true solar time for your birthplace. That is why two people born under the same zodiac sign can have completely different charts. Think of it as the Western zodiac’s high-resolution cousin.
The heart of the chart is your Day Master — the one character that represents you. New to all this? Start with what Saju is, or see how it lines up with BaZi.
Saju calculator — frequently asked questions
What is a Saju (BaZi) calculator?
A Saju calculator turns your birth date, time, and place into your Four Pillars of Destiny — eight characters (八字, BaZi) that map the Five Elements of the moment you were born. Saju is the Korean name for the system; BaZi is the Chinese name. This calculator is free and instant.
How accurate is this Saju calculator?
It corrects your birth hour to true solar time for your exact birthplace, so the hour pillar reflects the real position of the sun rather than the clock — two people born at the same clock time in different cities can get a different hour pillar. Enter your birth city and time for the most precise chart.
What is a Day Master?
Your Day Master is the heavenly stem of your day pillar — the single character that represents you, and the reference point every other part of the chart is read against. It is the closest Saju equivalent to a core personality type.
Is Saju the same as BaZi or the Four Pillars of Destiny?
Yes. Saju (Korean), BaZi (Chinese, 八字), and the Four Pillars of Destiny are three names for the same system. Given the same birth data they produce an identical chart: the same four pillars, the same Day Master.
Do I need to know my birth time?
No. If you know it, the calculator adds the hour pillar — two of the eight characters — for a full reading. If you do not, tick "I don't know my birth time" and it reads your year, month, and day pillars.
Is the Saju calculator free?
Yes. Calculating your Four Pillars chart and Day Master here is completely free.