Bazi Calculator

Bazi, 八字 (bāzì, "eight characters"), also known as the Four Pillars of Destiny, is the oldest continuously practiced system of Chinese astrology. A bazi chart writes your birth moment as four pillars, one each for the year, month, day, and hour, and each pillar is a pair: a heavenly stem and an earthly branch, drawn from the sixty-character cycle that has ordered Chinese time since the Shang dynasty. Eight characters total, hence the name.

The reading revolves around one character: the stem of your day pillar, called the day master. It stands for you. Every other character helps it, drains it, or disciplines it through the five elements, and the first judgment in reading a bazi chart is whether your day master stands strong or weak in its season. From that follows which elements are favorable for you, and from that follows the part people actually come for: timing.

Timing is what sets bazi apart from Western astrology's natal charts (ancient Greece did build a timing engine of its own, compared with luck pillars here). Your chart walks through ten-year luck pillars (大运, dà yùn) and yearly cycles, each one strengthening or straining your chart in a way the method scores concretely. Plot those scores year by year, in the candlestick grammar traders use for markets, and you get what recent tools have taken to calling a life chart or "life k-line": your whole timeline, readable at a glance. That is the chart this calculator draws.

The chart borrows the candlestick, finance's most literate little glyph, and defines it honestly. Each candle is one year. Its close is that year's overall score: fifty is neutral, above it the year's elements feed your chart, below it they tax it. Its open is simply last year's close, so the body shows the year-over-year move. The thin wicks are event range: years whose branch clashes, combines, or frictions with your natal pillars swing wider, in both directions, and the chart marks them so you can see which years were built to be eventful.

The shaded bands behind the candles are your luck pillars: ten-year chapters, each tilting its whole decade before any single year is counted. This is why the chart has visible eras rather than noise, and it follows the classical weighting, where the decade matters more than the year. The red seal stamps the highest ten-year window on your chart: your peak years. A jade candle rises; a gray candle eases. Gray is not loss: the tradition reads quiet stretches as consolidation years, when the chart says build, not harvest.

And because no honest chart is a black box, every candle opens: tap a year on your result and it shows its arithmetic in plain English, which element arrived, what it does to your day master, what the decade around it was doing.

The pillars themselves are standard: solar calendar, year boundary at Lichun (立春, ~February 4), month stems by the five-tigers rule, hour stems by the five-rats rule, luck pillars running forward or backward by the classical parity-of-year-and-sex rule. Any orthodox practitioner would cast the same eight characters we do.

The scoring follows the strength-and-support method that has anchored bazi teaching since Wei Qianli's 1935 textbook Qianli Minggāo (千里命稿): judge the day master by three things, seasonal timing (does your birth month feed your element?), rooting (does it have feet in the branches?), and support (do other stems stand with it?). We quantify those three with the standard modern position weights, the month branch counting heaviest, and read favorable elements by the old rule of the Yuanhai Ziping (渊海子平): strengthen the weak, drain the strong. Yearly and decade scores follow from there, decade first, year second, exactly the priority the classics assign.

One honest caveat, stated here and on every result: this is one school's reading, simplified so it can be shown in the open. Pattern-school and blind-school practitioners would weigh the same chart differently, and charts near the strong/weak boundary are exactly where schools disagree most. We flag those charts rather than pretending the argument does not exist.

Every weight, threshold, and formula the calculator uses is written out in full, and versioned, in the calculation methodology — worked end to end on a real chart, so the numbers can be audited rather than taken on faith.