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Moon Sign Compatibility Calculator

Compare two people's Moon signs and get an elemental compatibility score and reading, with famous-couple presets. Positions from the full Meeus/ELP-2000 series (arcminute level); for entertainment.

Related tools

All Astrology & numerology tools →
Moon Sign CalculatorFind your Moon sign from your birth date, time and UTC offset — the Moon changes sign about every 2.5 days, so the time matters. Positions from the full Meeus/ELP-2000 series (arcminute level); for entertainment.Sun, Moon & Rising Sign CalculatorFind your Sun, Moon and Rising (Ascendant) signs from your birth date, time and place using a built-in high-precision ephemeris. Positions from the full Meeus/ELP-2000 series (arcminute level); for entertainment.Mars Sign CalculatorFind your Mars sign from your birth date to explore your drive, energy and how you assert yourself. Positions from the full Meeus/ELP-2000 series (arcminute level); for entertainment.Mercury Sign CalculatorFind your Mercury sign from your birth date to explore your thinking and communication style. Positions from the full Meeus/ELP-2000 series (arcminute level); for entertainment.Venus Sign CalculatorFind your Venus sign from your birth date to explore your style in love and attraction, with famous-birthday presets. Positions from the full Meeus/ELP-2000 series (arcminute level); for entertainment.Zodiac Sign CalculatorFind your Western sun sign from your birth month and day, with its symbol, element, ruling planet, dates and a short trait profile.Angel Number CalculatorInterpret a recurring number you keep seeing (like 111, 444 or 1234) or reduce your birth date, and read its spiritual meaning.Astrological Element Balance CalculatorWeighs the Fire, Earth, Air and Water in a birth chart from the real positions of the Sun, Moon, Ascendant, Mercury, Venus and Mars — the personal points — computed with the site's arc-minute Meeus ephemeris, not a lookup table. The weighting (luminaries and rising sign count triple) is shown so the balance is reproducible.

Moon Sign Compatibility Calculator is free to use as often as you like, directly from this page. It sits under Astrology & numerology in our catalogue, alongside Moon Sign Calculator and Sun, Moon & Rising Sign Calculator.

How to use it

  1. Open the tool — no signup or install needed.
  2. Enter your input or adjust the available options.
  3. Get your result instantly, then copy or download it.

Frequently asked questions

What does Moon Sign Compatibility Calculator do?

Compare two people's Moon signs and get an elemental compatibility score and reading, with famous-couple presets. Positions from the full Meeus/ELP-2000 series (arcminute level); for entertainment.

When would I actually use this?

Looking up what a birth date or a name is said to mean: a sun sign, the rest of a birth chart, a life-path number, or the same for someone else before a conversation about it.

What is the most common mistake?

Taking a sun sign as the whole chart. Someone born a day either side of a cusp changes sign depending on the year and the time of day, and the moon and rising signs move much faster than the sun does — a birth time is what separates a chart from a guess.

How is Moon Sign Compatibility Calculator different from Moon Sign Calculator?

They sit next to each other but answer different questions: Moon Sign Calculator is the one to open when you need it to find your Moon sign from your birth date, time and UTC offset — the Moon changes sign about every 2.5 days, so the time matters. Positions from the full Meeus/ELP-2000 series (arcminute level); for entertainment. Pick whichever matches what you're starting from — both are free.

Is there a tool for the next step?

Sun, Moon & Rising Sign Calculator is the closest one after this: Find your Sun, Moon and Rising (Ascendant) signs from your birth date, time and place using a built-in high-precision ephemeris. Positions from the full Meeus/ELP-2000 series (arcminute level); for entertainment.

What else is worth having open alongside it?

Mars Sign Calculator and Mercury Sign Calculator — they come up in the same task often enough to be worth a second tab.

Where do the figures come from?

The positions are computed from real ephemeris arithmetic, not from a fixed table of dates, so a cusp birthday lands on the right side of the boundary for its own year. What those positions are taken to mean is tradition, not measurement, and the tools present it as such.

Further reading

All guides →
ExplainerSun, Moon and Rising Sign: What Each One Actually IsYour sun sign comes from the date, your moon sign from the Moon's position, your rising sign from the exact time and place. Here is what separates the three and why birth time matters.ExplainerYour Venus Sign Can Only Be One of FiveVenus never gets more than 47.2° from the Sun, so it is always within two signs of your Sun sign. Over 10,248 dates from 1966 to 2026 it lands in the same sign as the Sun barely a quarter of the time.GuideZodiac Sign Dates: The Full Table and Why Cusps ShiftThe twelve tropical zodiac dates, their elements, and the reason the boundary between two signs falls on a slightly different day each year.GuideBirthstones and Birth Flowers, Month by MonthThe full modern list of birthstones and birth flowers for all twelve months, where the list actually comes from, and why older references give different stones.GuideChinese Zodiac: The 12 Animals, Their Years and the New Year TrapThe twelve-year animal cycle, the years each animal covers, and why anyone born in January or early February is usually assigned the wrong one.ExplainerAngel Numbers 111, 222, 333: What Each Sequence MeansRepeating number sequences have a fixed set of meanings in modern numerology. Here is the full table from 000 to 999, where the idea comes from, and why we notice them.