Free saju chart calculator
Your full Four Pillars chart, computed the Korean way — pillars, Ten Gods, hidden stems, element balance, and decade luck cycles. Free, no sign-up.
Deterministic calendar math — nothing is stored, no sign-up.
Why charts disagree — and what this one does
Most free chart tools cut corners at the boundaries: the solar term that starts a month, the 11pm line that starts a day, the difference between clock time and the sun’s actual position. This calculator resolves solar terms to the minute, handles the midnight-hour boundary, and — when you enter a birthplace — corrects your hour pillar with true solar time (longitude plus the equation of time). If your birth sits near a boundary, that is exactly where cheap tools flip a pillar.
The numbers here are the same deterministic engine that powers our full saju reading — the reading adds the story on top. Curious what your day pillar says about you? Browse the 60 day-master dictionary or take the 60-character quiz.
Questions people ask
What is a saju chart?
Saju — Korea’s Four Pillars system, known elsewhere as BaZi — maps your birth year, month, day, and hour to four stem-branch pairs: eight characters total. The chart itself is pure calendar math; interpretation is a separate step built on top of it.
What does this calculator show?
All four pillars with their elements, each character’s Ten Gods role relative to your Day Master (the exact sub-type, like Direct Wealth vs. Indirect Wealth), the hidden stems inside each branch, the twelve life-stage of each pillar, your five-element balance with excesses and gaps, your decade luck pillars with starting ages, and notable stars (sinsal).
How accurate is the calculation?
Solar-term boundaries are resolved to the minute, the traditional 11pm day boundary is handled, and if you enter a birthplace the hour pillar uses true solar time — your actual longitude plus the equation of time, not just the clock. The engine is deterministic: no AI touches the numbers.
What if I don’t know my birth time?
The hour pillar is left blank and everything else still computes. Six of the eight characters — including your Day Master and element balance — come from the date alone.
Is my birth data stored?
No. This is a stateless tool: nothing is saved, and no account is needed.