Saju (사주, "four pillars") is Korea's traditional birth chart. It maps the year, month, day and hour you were born to eight characters, the same Four Pillars system known as BaZi in Chinese. The Day pillar's stem is your Day Master, the centre of the reading.

Yes. SajuPaste is a free Saju (Korean Four Pillars / BaZi) calculator. There is no account and nothing you enter is stored; the chart is computed on the server and returned to you.

What do I do with the text?

Press Copy text, open ChatGPT, Claude or Gemini, and paste it. The text already contains your full chart with Hanja labels and the instructions for a structured reading, so you can simply send it as-is or add your own questions.

I don't know my birth time. Can I still get a chart?

Yes. Choose "No" for birth time and the chart is built from the Year, Month and Day pillars. If you know the rough window, pick the matching animal hour instead; the Hour pillar is then calculated from the middle of that window.

How accurate is the calculation?

The Day and Hour pillars use true solar time at your birthplace (longitude and the equation of time), and the Year and Month pillars use the exact solar-term boundaries. Historical time zones and daylight-saving rules are applied automatically. The engine is the same one used by Korea Fortune.

What is the difference between Saju and BaZi?

They are the same Four Pillars system. Saju is the Korean tradition and uses Korean readings of the characters (Gap, Eul, Byeong… for stems), while BaZi is the Chinese tradition and uses pinyin (Jia, Yi, Bing…). The Hanja and the calculation are identical, so a BaZi reader can read a Saju chart and vice versa.

Questions people ask

Short answers about Saju, BaZi and how this calculator works.

What is Saju?: Saju (사주, "four pillars") is Korea's traditional birth chart. It maps the year, month, day and hour you were born to eight characters, the same Four Pillars system known as BaZi in Chinese. The Day pillar's stem is your Day Master, the centre of the reading.
Is SajuPaste free?: Yes. SajuPaste is a free Saju (Korean Four Pillars / BaZi) calculator. There is no account and nothing you enter is stored; the chart is computed on the server and returned to you.
What do I do with the text?: Press Copy text, open ChatGPT, Claude or Gemini, and paste it. The text already contains your full chart with Hanja labels and the instructions for a structured reading, so you can simply send it as-is or add your own questions.
I don't know my birth time. Can I still get a chart?: Yes. Choose "No" for birth time and the chart is built from the Year, Month and Day pillars. If you know the rough window, pick the matching animal hour instead; the Hour pillar is then calculated from the middle of that window.
How accurate is the calculation?: The Day and Hour pillars use true solar time at your birthplace (longitude and the equation of time), and the Year and Month pillars use the exact solar-term boundaries. Historical time zones and daylight-saving rules are applied automatically. The engine is the same one used by Korea Fortune.
What is the difference between Saju and BaZi?: They are the same Four Pillars system. Saju is the Korean tradition and uses Korean readings of the characters (Gap, Eul, Byeong… for stems), while BaZi is the Chinese tradition and uses pinyin (Jia, Yi, Bing…). The Hanja and the calculation are identical, so a BaZi reader can read a Saju chart and vice versa.

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