Published June 19, 2026  |  Reading time: ~5 min

Korean Astrology Free Birth Chart: Your Saju Four Pillars Explained

Korean astrology, known as Saju (사주) or the Four Pillars of Destiny, has been used for over a thousand years to map an individual's character, relationships, and life path. Unlike Western sun-sign astrology, Saju does not rely on a single birth date — it uses the precise year, month, day, and hour of birth to construct an eight-character grid (八字, Paljja) that captures the five elemental forces present at the moment you were born.

This guide explains how to read your free chart, what each pillar means, and how a paid full analysis goes deeper into the timing of events in your life.

What Are the Four Pillars?

The Four Pillars system works by converting your birth date and time into the traditional Chinese sexagenary calendar, where each unit of time is described by a pair of characters: a Heavenly Stem (天干) and an Earthly Branch (地支). The ten Heavenly Stems cycle through the five elements — Wood, Fire, Earth, Metal, Water — each in Yin and Yang form. The twelve Earthly Branches correspond to the twelve animals of the zodiac and also carry elemental meaning.

Together, your eight characters describe the elemental environment you were born into and shape how those forces interact throughout your life.

Year Pillar (年柱)

The Year Pillar encodes the broad generational energy of your birth year and relates to your outer social persona — how others first perceive you, your relationship with authority figures and grandparents, and the macro economic era that shaped your early worldview. It is often the first thing Korean practitioners glance at when meeting a new person.

Month Pillar (月柱)

The Month Pillar reflects the season and elemental climate of your birth month. It governs career tendencies, your relationship with parents and mentors, and the environmental conditions you are accustomed to. When a practitioner assesses career timing, the Month Pillar and its relationship to the Day Master is often the primary focus.

Day Pillar (日柱) — Your Day Master

The Heavenly Stem of the Day Pillar is called the Day Master (日主, Ilju) and is the single most important character in the entire chart. It represents your core self — your essence, values, and the lens through which you experience every other force in your chart. All other pillars are interpreted relative to the Day Master. For example, a Yin Water Day Master reads the chart differently from a Yang Metal Day Master, even if all other pillars are identical.

Hour Pillar (時柱)

The Hour Pillar governs the inner life, subconscious desires, children, and late-life phases. It is the most personal and intimate of the four pillars. Because birth time is frequently uncertain or unrecorded, this pillar is the one most often missing — and its absence does reduce reading precision, particularly for the second half of life.

Free Chart vs. Full Analysis: What Each Includes

The free chart gives you the raw material — the eight characters that form your grid. The paid full analysis interprets those characters in depth, maps how external luck cycles interact with them over decades, and translates the findings into practical language about your work, relationships, and timing.

How to Read Your Free Chart

When you generate your chart at sajuapp.app/en, you will see the grid displayed with your eight characters. Here is a quick orientation:

1. Identify your Day Master

Look at the top character in the Day column (the third column from the left). This single character — one of ten Heavenly Stems — is your Day Master. The ten stems and their elements are: 甲/乙 = Wood, 丙/丁 = Fire, 戊/己 = Earth, 庚/辛 = Metal, 壬/癸 = Water. Capital letters represent Yang; lowercase Yin. Your Day Master tells you which elemental force you embody.

2. Count the five elements

Scan all eight characters and note which of the five elements appear and how many times. A chart heavy in Water and Metal, for instance, tends toward introspective, analytical temperaments — but only in combination with other factors. An imbalance (one element absent, another dominant) is worth noting as a focal point for the full analysis.

3. Look for obvious clashes or harmonies

Certain pairs of Earthly Branches clash (衝) or harmonize (合). The six clashes — for example, 子 (Rat) vs. 午 (Horse) — create tension and movement. The six harmonies create smoother, supportive energy. If your Day Branch and Year Branch are a classic clash pair, that combination often surfaces as a recurring theme in your family or career story.

4. Note the chart's overall elemental balance

A chart is considered balanced when no single element dominates the others without adequate checks. Complete absence of an element is noted as a "missing element" (空亡), which classical Saju practitioners associate with specific life themes that tend to feel elusive or requiring extra cultivation. The paid reading maps this in detail and suggests practical directions.

Frequently Asked Questions