Zodiac Calendar Calculator
Zodiac calendar calculator works out Zodiac sign and Sign glyph from Birth date. The default figures on this page give zodiac sign of Aries; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
4 steps
- Parsed 2000-03-21 as a Gregorian date: month 3, day 21.
- Matched month-day 03-21 against the twelve inclusive conventional ranges.
- 03-21 falls inside 03-21..04-19, which is Aries.
- Aries is a cardinal fire sign ruled by Mars.
All twelve conventional rangestable
| sign | range | element | modality | ruler |
|---|---|---|---|---|
| Capricorn | 12-22..01-19 | Earth | Cardinal | Saturn |
| Aquarius | 01-20..02-18 | Air | Fixed | Saturn (modern Uranus) |
| Pisces | 02-19..03-20 | Water | Mutable | Jupiter (modern Neptune) |
| Aries | 03-21..04-19 | Fire | Cardinal | Mars |
| Taurus | 04-20..05-20 | Earth | Fixed | Venus |
| Gemini | 05-21..06-20 | Air | Mutable | Mercury |
| Cancer | 06-21..07-22 | Water | Cardinal | Moon |
| Leo | 07-23..08-22 | Fire | Fixed | Sun |
| Virgo | 08-23..09-22 | Earth | Mutable | Mercury |
| Libra | 09-23..10-22 | Air | Cardinal | Venus |
| Scorpio | 10-23..11-21 | Water | Fixed | Mars (modern Pluto) |
| Sagittarius | 11-22..12-21 | Fire | Mutable | Jupiter |
Its 4 worked examples are re-run on every release, last on 15 September 2026. What changed
Sources and references
2 sources
What the zodiac calendar calculator calculates
Returns the western tropical sun sign for a birth date from the conventional fixed civil-date ranges, with the matched range and calculation basis shown.
How to use this zodiac calendar calculator
Enter Birth date. Zodiac sign updates as you type. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind Zodiac sign, Sign glyph and Conventional sign range.
The method follows Claudius Ptolemy, Tetrabiblos, Book I (translated F. E. Robbins, Loeb Classical Library 435) and Hong Kong Observatory, The 24 Solar Terms.
What you can compare
Change one input at a time to see how it affects Zodiac sign, Sign glyph and Conventional sign range. The inputs you can vary are Birth date.
Understanding Zodiac sign, Sign glyph and Conventional sign range
For entertainment and cultural interest. Astrology and numerology are traditional practices with no scientific basis for predicting events or describing a person; do not use them for health, financial or legal decisions.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
See something wrong? Report a problem with this calculator
Frequently asked questions
Who is the fakest zodiac?
Returns the western tropical sun sign for a birth date from the conventional fixed civil-date ranges, with the matched range and calculation basis shown. Put your own figures in above and the working updates beside the result. For scale, the default figures on this page give Aries.
Who is the luckiest zodiac sign in 2026?
The calculation is free and does not require an account. An account is only needed for optional features such as saving, comparing, exporting, or sharing supported scenarios.
What information do I need for the zodiac calendar calculator?
You need Birth date. The page opens with default figures that give zodiac sign of Aries, so you can see the scale before entering your own.
What does this zodiac calendar calculator show?
It shows Zodiac sign, Sign glyph, Conventional sign range, Calculation basis, Element, Modality, Ruling planet and Polarity, with the working and any warnings for your entries.
Can I check how the zodiac calendar calculator result was calculated?
Yes. The “How this is worked out” section shows the calculation steps, and the sources section identifies the references used for the method.