Free Zodiac Sign Calculator
Western astrological sign from a birth date.
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Inputs
Result
Zodiac sign
Gemini
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Short answer
Western astrological sign from a birth date.
What is the Zodiac Sign Calculator?
Western astrological sign from a birth date.
How does the Zodiac Sign Calculator work?
Enter the inputs above and read the result.
Formula
Variables
m, dBirth month and day
Explanation
The 12 Western zodiac signs each span a fixed range of dates in the solar calendar.
Examples
Applications
Advantages
Limitations
Common mistakes
Tips
Related concepts
The Zodiac Sign Calculator sits inside the Date & Time Calculators hub, in the date arithmetic & calendars cluster. Adding to or classifying a date. Understanding the terms below makes the output easier to interpret and easier to compare against neighbouring measures.
Practical use cases and industry applications
Understanding Zodiac Sign
Western astrological sign from a birth date. Within date & time calculators, zodiac sign belongs to the date arithmetic & calendars cluster, where it shares terminology and assumptions with closely related tools.
Learning how zodiac sign is calculated
The 12 Western zodiac signs each span a fixed range of dates in the solar calendar. Working through the variables one at a time — m, d — makes the result reproducible by hand and easier to sanity-check.
Using zodiac sign to make a decision
Because outputs depend on the assumptions you enter, run more than one scenario before committing to a figure.
How zodiac sign compares with related measures
calendar rule, weekday, leap year, week number all describe adjacent aspects of date arithmetic & calendars. Comparing this calculator's output against those measures — using the related tools listed on this page — prevents a single metric from being read in isolation.
Frequently asked questions
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