Does this AI BaZi calculator cost anything or require an account?
No. The full Four Pillars calculator, True Solar Time calibration, 10-Year Da Yun luck cycles, and Almanac Identity Card are 100% free and do not require signup.
Online Tools & Utilities
BaziTools
Free AI BaZi calculator with astronomical precision and plain-English life readings
- Community votes0
- DR by Ahrefs0 no change since last check
- Started2026
Ahrefs Domain Rating set in type 15 Nov 2026, reset 15 Nov 2026.
Free calculator and readings for Four Pillars (BaZi) Chinese astrology, calibrated to exact solar longitude and True Solar Time.
The story so far
BaziTools provides a free, no-signup-required Four Pillars (BaZi) calculator and astronomical ephemeris for classical Chinese metaphysics. The platform computes natal charts calibrated to True Solar Time, accounting for exact birth longitude and the Equation of Time, which standard clock time ignores. Users receive readings including Day Master personality analysis, 10-Year Da Yun luck cycles, Spouse Palace compatibility, and daily auspicious horology from the Tong Shu Almanac. The tool also generates personalized Chinese names optimized for Five-Element balance and offers AI prompts for deeper chart interpretation using ChatGPT or Claude. All calculations are grounded in Song-Ming dynasty classical texts including San Ming Tong Hui and Zi Ping Zhen Quan.
Typeset features
- Four Pillars natal chart calculation with True Solar Time calibration
- Day Master personality archetypes and core element analysis
- 10-Year Da Yun luck cycle forecasting
- 78-pair Synastry matrix for relationship compatibility
- Daily Tong Shu Almanac with auspicious activities and taboos
- Birth-time rectification engine for unknown birth hours
- AI prompts for ChatGPT and Claude interpretation
- Zi Wei Dou Shu (Purple Star Astrology) cross-verification
- Deterministic solar-longitude ephemeris from 1900 to 2100
Pricing
Pricing model: Free
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Ahrefs Domain Rating set in type 15 Nov 2026, reset 15 Nov 2026. Majestic set 15 Nov 2026, reset 15 Nov 2026. Link data typeset by Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.
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| Registrar | Cloudflare, Inc. |
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Questions and answers
Why does BaZi require True Solar Time instead of standard clock time?
Standard civil time zones span 15 degrees of longitude (60 minutes of solar variance), and Earth's elliptical orbit introduces an additional ±16-minute Equation of Time shift. Calibrating to True Solar Time ensures your Two-Hour Earthly Branch reflects the actual meridian angle of the sun at your birth location.
When does the Chinese Zodiac Year Pillar change: Lunar New Year or Start of Spring?
In authentic Four Pillars (BaZi) and Feng Shui Kua calculations, the Year Pillar transitions at the exact astronomical moment of Start of Spring (Lichun, when solar longitude reaches 315.0° around February 4), rather than Lunar New Year Day.
What should I do if I do not know my exact birth hour?
Select "I don't know the birth hour (6-Character Mode)" in the calculator to compute your Year, Month, and Day pillars, which preserve 75% of the natal chart including your Day Master and Spouse Palace. You can also use the 12-Shichen Birth-Time Rectification Engine.
How do I read a BaZi chart step by step?
Follow three signals in order: (1) Day Master — the Heavenly Stem of your Day Pillar reveals your core element and strength; (2) Useful God — the balancing element that unlocks career, wealth, and marriage; and (3) 10-Year Da Yun & Annual Transit — how current transits interact with your natal branches.
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