Astrology
Astrology Calculators
Sun signs, Chinese zodiac, compatibility, numerology, and retrograde dates.
8 tools
Biorhythm Calculator
Biorhythm calculator: chart your physical, emotional and intellectual cycles for any date from your birth date. Free, private, runs locally, no signup.
Chinese Zodiac Calculator
Chinese zodiac calculator: find your animal sign AND element from your birth year, with traits, lucky numbers, and compatibility. Free, instant, private.
Mercury Retrograde Calculator
Mercury retrograde calculator: find every Mercury retrograde start, end, and shadow period for any year, with exact dates. Free, runs in your browser.
Numerology Life Path Calculator
Numerology life path calculator: reduce your birth date to your life path number with its meaning and traits. Free, runs locally in your browser, no signup.
Numerology Name Number Calculator
Numerology name number calculator: convert any full name to its destiny number using Pythagorean letter values. Free, runs locally in your browser, no signup.
Zodiac Compatibility Calculator
Zodiac compatibility calculator: score any two signs on love, communication, and long-term fit, with strengths and friction points. Free, private, no signup.
Zodiac Element Calculator
Zodiac element calculator: find your sign's element, modality and best compatibility matches from your birth date. Free, private, runs locally, no signup.
Zodiac Sign Calculator
Zodiac sign calculator: enter your birthday to get your sun sign, element, ruling planet, and date range instantly. Free, runs in your browser, no signup.
What these astrology tools actually compute
Everything here is deterministic calendar or arithmetic math: sun-sign boundaries are fixed date ranges, Chinese zodiac years cycle on a 12-year ladder with a fixed lunar-new-year boundary, numerology reduces numbers by digit sums, and retrograde dates come from published astronomical ephemerides.
Honest framing: astrology is not empirically supported as a predictive system. What these tools do reliably is the math inside the tradition, so a birthday lookup or a retrograde check is factually correct within its own system. We label the entertainment status of each tool plainly rather than dressing the output up as science.
Choosing a tool
Use the sun-sign tool for Western-style birthday lookups, the Chinese zodiac for lunar-new-year boundaries (which move between January 21 and February 20), and numerology for name and date reductions. For retrograde claims, check the dates against the published ephemeris rather than a meme.