Mysticism calculators

Moon Sign Calculator

Updated Jun 23, 2026 By Jehan Wadia
Formulas
About You
Used only to personalize your results.
Date of Birth
Birth Time
If unknown, noon (12:00 PM) is used as a default for calculation.
Birth Location
    Type at least 3 letters and choose from the list to auto-fill your time zone offset.
    Please verify this offset is correct for your birth date. Daylight saving time may affect the value.
    Selecting a zone updates the UTC offset above.

    Your Moon Sign is —

    Moon at —

    Quick-Glance Summary

    “Degree” is the Moon’s exact position within the 30°-wide sign (0°–29.99°). Each sign is split into three 10° decans.

    Personality Snapshot

    Step-by-Step Solution

    Moon's Path on Your Birth Day

    The Moon's ecliptic longitude across a 24-hour window centred on your birth moment. Horizontal markers show sign boundaries; the dot marks your birth.

    Introduction

    Your Moon sign reveals how you feel, what you need, and how you react when no one is watching. While your Sun sign shows who you are on the outside, your Moon sign is your inner self — the part that drives your moods, your gut feelings, and how you love. It is one of the most important parts of your birth chart in astrology.

    To find your Moon sign, you need your date of birth, your birth time, and the place you were born. The Moon moves fast — it changes signs about every two and a half days — so even a few hours can shift your result. That is why an accurate Moon sign calculator matters.

    This free Moon sign calculator uses your birth details to find the Moon's exact position in the zodiac at the moment you were born. It shows you which of the 12 signs your Moon falls in, what degree it sits at, which decan it belongs to, and what lunar phase you were born under. You also get a full breakdown of your emotional personality, including how you handle stress, how you act in relationships, and how your Moon sign differs from your Sun sign. Every result includes a step-by-step solution so you can see exactly how the math works.

    Enter your birth info below and press Calculate My Moon Sign to get your results in seconds.

    How to Use Our Moon Sign Calculator

    Enter your birth details below to find your moon sign. The calculator uses your date, time, and place of birth to show your exact moon sign, degree, moon phase, decan, and a full personality reading.

    First Name: Type your first name if you want your results to feel personal. This field is optional and you can leave it blank.

    Birth Month, Day, and Year: Pick the month, day, and year you were born using the dropdown menus. Make sure the date is correct, as even one day off can change your moon sign. If you need help figuring out how many days have passed since a specific date, our Date Duration Calculator can help.

    Birth Time: Select the hour, minute, and AM or PM of your birth. Your exact birth time matters because the moon changes signs roughly every two and a half days. If you do not know your birth time, check the box that says "I don't know my exact birth time" and the calculator will use noon as a default.

    Birth Location: Start typing the city where you were born and pick it from the list that appears. This fills in your UTC time zone offset automatically. If your city does not show up, you can type your UTC offset by hand or choose a time zone from the dropdown list. Our Time Zone Calculator can help you confirm the correct offset. Always double-check that the offset is right for your birth date, especially if daylight saving time was in effect.

    Calculate My Moon Sign: Click this button once all fields are filled in. Your moon sign results, personality snapshot, step-by-step math, and a moon path chart will appear instantly below.

    What Is a Moon Sign?

    In astrology, your Moon sign is the zodiac sign the Moon was in at the exact moment you were born. While your Sun sign shows who you are on the outside, your Moon sign reveals your inner world — your feelings, moods, and emotional needs. It shapes how you react when you are happy, sad, stressed, or in love.

    How Your Moon Sign Is Calculated

    The Moon moves fast. It travels through all 12 zodiac signs roughly every 27.3 days, spending about two and a half days in each sign. Because of this quick movement, your birth date alone is not enough to find your Moon sign. You also need your birth time and birth location. Even a few hours can change the result, especially if the Moon was close to moving into the next sign.

    Why Your Moon Sign Matters

    Your Moon sign is one of the most important parts of your birth chart. It tells you what makes you feel safe, how you handle stress, and what you need in close relationships. For example, a person with a Cancer Moon needs comfort and closeness, while someone with an Aquarius Moon needs space and freedom. Knowing your Moon sign helps you understand your deepest emotional patterns — the ones you might not even show to the world. Pairing your Moon sign with your life path number or your Chinese zodiac sign can give you an even richer picture of your personality and purpose.

    What the Results Include

    This Moon sign calculator gives you your exact Moon sign, the degree and decan (a 10° subdivision of each sign), the Moon phase at your birth, and your sign's element and modality. It also provides a personality snapshot covering your core emotional nature, stress responses, relationship style, and how your Moon sign differs from a Sun sign in the same position. For deeper insight into relationship dynamics, try our Love Calculator alongside your Moon sign results. A step-by-step breakdown shows exactly how the result was reached, and a chart plots the Moon's path across your birth day. To explore all of your planetary placements at once — including your Sun, Moon, and rising signs — use our full Birth Chart Calculator. You can also discover the hidden meaning in your name with our Numerology Calculator.

    Formulas used

    Julian Day Number
    JD = \lfloor 365.25(Y + 4716) \rfloor + \lfloor 30.6001(M + 1) \rfloor + D + \frac{h + m/60}{24} + B - 1524.5
    Kepler's Equation (Newton-Raphson iteration)
    E_{n+1} = E_n - \frac{E_n - e \cdot \frac{180}{\pi} \sin E_n - M}{1 - e \cos E_n}
    True anomaly and orbital radius
    v = \operatorname{atan2}\!\left(a\sqrt{1-e^2}\,\sin E,\; a(\cos E - e)\right),\quad r = \sqrt{a^2(\cos E - e)^2 + a^2(1-e^2)\sin^2 E}
    Geocentric ecliptic longitude from orbital elements
    \lambda = \operatorname{atan2}\!\left(\sin\Omega\cos(v+\omega)+\cos\Omega\sin(v+\omega)\cos i,\;\cos\Omega\cos(v+\omega)-\sin\Omega\sin(v+\omega)\cos i\right)
    Lunar longitude perturbation corrections
    \Delta\lambda = -1.274\sin(M_m - 2D) + 0.658\sin 2D - 0.186\sin M_s - 0.059\sin(2M_m - 2D) + \cdots
    Zodiac sign index and degree within sign
    k = \left\lfloor \frac{\lambda_{\text{Moon}}}{30} \right\rfloor, \quad \delta = \lambda_{\text{Moon}} - 30k

    Frequently asked questions

    What if I don't know my exact birth time?

    Check the box that says "I don't know my exact birth time." The calculator will use noon (12:00 PM) as a default. This gives a good estimate for most people. However, since the Moon changes signs about every two and a half days, your true Moon sign could be different if you were born early in the morning or late at night. Check your birth certificate or ask a parent for a more exact time.

    How accurate is this Moon sign calculator?

    This calculator uses standard astronomical formulas to find the Moon's position in the sky at your birth moment. It includes perturbation corrections for the Sun's gravitational pull on the Moon's orbit. For most people, the result matches professional astrology software. Accuracy depends on having the right birth time and UTC offset. If your birth time is off by a few hours, your Moon sign could be wrong — especially if the Moon was near a sign boundary.

    Why does my Moon sign differ from what another website says?

    Small differences in how a calculator handles your time zone, daylight saving time, or the astronomical math can change the result — especially if the Moon was close to switching signs at your birth. Double-check that your birth time, date, and UTC offset are correct. If the calculator shows a boundary warning, both signs may apply, and a professional astrologer can help you confirm which one is right.

    What does the boundary warning mean?

    A boundary warning appears when the Moon was very close to moving from one sign to the next around the time you were born. This means a small change in your birth time could shift your Moon sign. If you see this warning, try to confirm your exact birth time so you get the most accurate result.

    What is a decan and why does it matter?

    Each zodiac sign spans 30 degrees. A decan splits that into three equal parts of 10 degrees each. The first decan (0°–10°) is ruled by the sign's main planet. The second (10°–20°) and third (20°–30°) decans are each ruled by a different planet, adding extra flavor to your Moon sign personality. Two people can share the same Moon sign but feel it differently because they are in different decans.

    What is a critical degree?

    Certain degrees within a sign are called critical degrees. They are thought to make the Moon's energy stronger and more intense. The exact degrees depend on whether your Moon sign is cardinal, fixed, or mutable. If your Moon lands on a critical degree, the calculator will show a yellow notice letting you know.

    What is the Moon phase at birth and why does it matter?

    The Moon phase at birth is the shape the Moon was in when you were born — such as New Moon, Full Moon, or a quarter phase. Each phase carries a different energy. For example, people born under a New Moon tend to be natural starters, while those born under a Full Moon often have strong, outward emotional expression. Your birth phase adds another layer to your Moon sign reading.

    Is my Moon sign the same as my Sun sign?

    Usually not. Your Sun sign is based on the date you were born and stays the same for about a month. Your Moon sign is based on where the fast-moving Moon was at your exact birth time and changes every two to three days. It is possible to have the same Sun and Moon sign, but most people have two different signs.

    What is the difference between a Moon sign and a rising sign?

    Your Moon sign is about your inner emotions, private moods, and deepest needs. Your rising sign (also called the ascendant) is the zodiac sign that was coming up over the eastern horizon when you were born. It shapes how other people see you at first glance. The Moon sign is your inner world; the rising sign is your outer first impression.

    Why does birth location affect my Moon sign?

    Your birth location helps the calculator figure out the correct time zone offset (UTC). This is needed to convert your local birth time into universal time (UTC), which is what the astronomical math uses. A wrong location or offset can shift the calculated time by hours, which may change your Moon sign.

    What is a UTC offset and how do I find mine?

    A UTC offset is the number of hours your local time zone is ahead of or behind Coordinated Universal Time (UTC). For example, New York is UTC−05:00 in winter and UTC−04:00 during daylight saving time. When you pick a city from the search list, the calculator fills in the offset for you. If you enter it by hand, use the format like +05:30 or −08:00.

    Does daylight saving time affect my result?

    Yes. Daylight saving time shifts the UTC offset by one hour. If your area used daylight saving time on your birth date, you need the adjusted offset — not the standard one. When you select a city from the autocomplete list, the calculator tries to account for this. Always double-check that the UTC offset shown is correct for your specific birth date.

    Can I use this calculator for someone else?

    Yes. Just enter the other person's birth date, time, and location instead of your own. You can also type their name in the First Name field so the results are personalized for them.

    What does the Moon path chart show?

    The chart at the bottom of the results plots the Moon's position across a 24-hour window centered on your birth time. The horizontal line shows hours before and after birth. The vertical line shows the Moon's ecliptic longitude in degrees. Sign boundaries are marked with orange lines, and a dot marks where the Moon was at the exact moment of your birth.

    What years does this calculator support?

    The calculator covers birth years from 1900 to 2050. If you were born within this range, you can use it to find your Moon sign. The astronomical formulas are most accurate for dates in the modern era.

    Is my data saved or shared?

    No. All calculations happen right in your web browser. Your birth date, time, and location are not sent to any server or stored anywhere. Your information stays private on your device.

    What if my city does not appear in the search list?

    If your city does not show up, you have two options. You can type your UTC offset by hand in the UTC Offset field, or you can pick the closest time zone from the dropdown list. Either method will let the calculator run correctly.

    Can my Moon sign change during the day?

    Yes. The Moon can move from one sign to the next at any point during the day. That is why birth time is so important. If the Moon switched signs on the day you were born, people born in the morning might have a different Moon sign than people born that same evening.

    Related Mysticism calculators

    All Mysticism calculators
    Mysticism

    Birth Chart Calculator

    Calculate your natal chart from birth date, time, and city. Get planet signs and degrees, ascendant, houses, and element and modality balance.

    Open     Mysticism

    Chinese Zodiac Calculator

    Use our free Chinese Zodiac Calculator to find your zodiac animal sign by birth year. Discover your personality traits, compatibility, and element instantly.

    Open