A free saju calculator turns your birth date and hour into your Korean four pillars chart — eight characters that describe your Day Master, your Five Elements balance, and how those parts relate. This page explains what a saju calculator actually does, how to read its result, and where to run yours free, in plain English, with no sign-up — in about a minute.
Saju (사주) means "four pillars." A saju calculator takes your birth date, time and place and converts them, using the traditional lunisolar calendar and solar terms, into eight characters — one Heavenly Stem and one Earthly Branch for each pillar:
The calculation itself is deterministic: a correct calculator returns the same eight characters every time from the same birth data. The interpretation — what those characters mean for you — is the part that needs a clear, plain-English reading.
| Part of the chart | What it tells you |
|---|---|
| Day Master (일간) | Your core element — how you naturally move, decide and recharge. |
| Five Elements balance (오행) | Which of Wood, Fire, Earth, Metal, Water dominate your chart and which run thin. |
| Eight characters (팔자) | The full grid — year, month, day and hour stems and branches. |
| Sip-sin (십신) | How each character relates to your Day Master: themes of work, output, wealth, learning and peers. |
| Daewoon (대운) | Your ten-year luck cycles — why the same chart reads differently across decades. |
Honesty matters here. A saju calculator gives you an accurate chart, but a chart is not a prophecy. It will not name dates, guarantee outcomes, or make decisions for you. Saju describes temperament and timing in a long-standing tradition; it is offered for entertainment and reference. Read it the way you would a thoughtful personality framework with a much longer history — useful for reflection, not a substitute for your own judgment.
The calculation and your core chart — four pillars, Day Master, Five Elements summary — are free and need no sign-up. Optional deeper readings exist as paid features, but you are never required to pay to see and understand your own chart.
Yes. A date-only chart gives you three of the four pillars, which already carry your Day Master and most of your element balance. The hour pillar adds depth. If you want the detail of the fourth pillar, see the guide to saju and birth time.
The eight-character chart is the same; saju is the Korean tradition and BaZi the Chinese one, and Korean saju leans harder on the Sip-sin relational reading. The calculation matches. For the full comparison, read saju vs Chinese BaZi.
Right here — the free Cheonmyeongdang calculator turns your birth date and hour into your eight characters, Day Master and Five Elements summary in plain English, with no account needed.