What this calculator does
- Converts your local birth time to universal time using the time-zone rules in force on that date, including daylight saving time.
- Finds the solar term before your birth to set the year and month pillars.
- Counts the day pillar from the Julian day number.
- Derives the hour pillar from the day stem, optionally corrected to true solar time.
- Weighs the five elements including hidden stems, assigns the ten gods, judges Day Master strength and lays out your ten-year luck pillars.
Month boundaries: the 12 jie solar terms (2026)
Each saju month starts at a solar term, not on the 1st. Here are this year's exact times as computed by Sajuwise:
| Term | Name | Starts | Month branch |
|---|
| 立春 | Lichun | 2026-02-03 20:01 UTC | 寅 tiger |
| 驚蟄 | Jingzhe | 2026-03-05 13:59 UTC | 卯 rabbit |
| 淸明 | Qingming | 2026-04-04 18:40 UTC | 辰 dragon |
| 立夏 | Lixia | 2026-05-05 11:49 UTC | 巳 snake |
| 芒種 | Mangzhong | 2026-06-05 15:49 UTC | 午 horse |
| 小暑 | Xiaoshu | 2026-07-07 01:57 UTC | 未 goat |
| 立秋 | Liqiu | 2026-08-07 11:42 UTC | 申 monkey |
| 白露 | Bailu | 2026-09-07 14:42 UTC | 酉 rooster |
| 寒露 | Hanlu | 2026-10-08 06:30 UTC | 戌 dog |
| 立冬 | Lidong | 2026-11-07 09:52 UTC | 亥 pig |
| 大雪 | Daxue | 2026-12-07 02:52 UTC | 子 rat |
| 小寒 | Xiaohan | 2027-01-05 14:10 UTC | 丑 ox |
Hour branches
| Branch | Animal | Local time |
|---|
| 子 Ja | rat | 23:00–01:00 |
| 丑 Chuk | ox | 01:00–03:00 |
| 寅 In | tiger | 03:00–05:00 |
| 卯 Myo | rabbit | 05:00–07:00 |
| 辰 Jin | dragon | 07:00–09:00 |
| 巳 Sa | snake | 09:00–11:00 |
| 午 O | horse | 11:00–13:00 |
| 未 Mi | goat | 13:00–15:00 |
| 申 Sin | monkey | 15:00–17:00 |
| 酉 Yu | rooster | 17:00–19:00 |
| 戌 Sul | dog | 19:00–21:00 |
| 亥 Hae | pig | 21:00–23:00 |
Frequently asked questions
Is this BaZi calculator free?
Yes. Your full Four Pillars chart, element balance and core reading are free with no sign-up.
Why does my year pillar differ from my Chinese zodiac sign?
Many zodiac websites switch years at Lunar New Year. BaZi switches at Lichun, the start of spring, around February 4. If you were born between Lunar New Year and Lichun (or the other way round), your year pillar may differ from the animal you have always been told.
Should I use true solar time?
Schools differ. Many Korean practitioners correct for longitude because Korea uses a time zone centered east of the peninsula (about 30 minutes ahead of local solar time in Seoul). Try both if you were born near the edge of a two-hour block.
How are births between 23:00 and midnight handled?
By default the 子 (Rat) hour starting at 23:00 begins the next day, as in classical BaZi. In the advanced options you can choose the Korean "night rat hour" (야자시) convention, which keeps the same day pillar.