Korean saju reads the calendar you were born into rather than the sky. Your year, month, day and hour of birth are each converted into a pair of characters drawn from ten heavenly stems and twelve earthly branches. Four pairs, eight characters — the four pillars.
The pillar that matters most is the day. Its heavenly stem is your day master, the piece of the chart that represents you. Everything else is read in relation to it: which of the five elements feed it, which exhaust it, which it has to push against. This is why a Korean birth chart can separate two people born on the same date — a different hour produces a different fourth pillar, and often a different balance entirely.
Those five elements — wood, fire, earth, metal and water — rarely arrive evenly. Most charts lean, with one element crowding the others and one barely present. Traditional practice reads that imbalance as temperament and as a pattern of what tends to come easily and what tends to cost you effort. The chart also carries ten-year cycles (daeun), which is where readings talk about seasons of life rather than fixed events.
What this page does: it calculates your four pillars from your birth data, then has three AI oracles interpret the same chart in three different voices. The calculation is deterministic — the same birth data always produces the same eight characters. The interpretation is written by AI, so treat it as entertainment rather than advice.
- What is a Korean birth chart?
- It's called saju (사주), meaning 'four pillars'. Your birth year, month, day and hour each become a pillar written with two characters — one heavenly stem and one earthly branch — which is where the older name palja, 'eight characters', comes from. Those eight characters are what a reader interprets.
- How is it different from a Western birth chart?
- A Western chart maps planets onto a zodiac at the moment you were born. Saju doesn't use planets at all. It reads the sexagenary calendar — a 60-term cycle of stems and branches — and the balance of five elements (wood, fire, earth, metal, water) inside your eight characters. Two people with the same sun sign routinely have completely different charts here.
- Do I need my exact birth time?
- The hour pillar is one of the four, so without a time you lose a quarter of the chart — including the pillar most associated with later life and private character. You can still read the other three. If you don't know your hour, it's better to skip it than to guess, because a wrong hour changes the pillar outright.
- What is a day master?
- The heavenly stem of your day pillar. In saju it stands for you, and the rest of the chart is read in relation to it — which elements support it, which drain it, which it controls. That's why two charts with the same element counts can still read very differently.
- Is this Korean birth chart calculator free?
- The calculation and the opening chapters are free, and you don't need an account to see them. The full 14-chapter reading is a one-time purchase — no subscription.
- Is the reading accurate?
- The chart itself is calculated, not guessed: the pillars, elements and cycles follow fixed calendar rules. The interpretation is AI-written entertainment. Read it as a lens for thinking about yourself, not as a prediction of what will happen.
AI-generated entertainment content. Not a substitute for professional advice.
