Free tool · 03

The free Moon Sign
calculator

The sign the Moon was passing through at your birth. The inner weather — your instincts, comforts, the things you reach for in the dark.

EngineSwiss Ephemeris·Time±1 minute precision·Accountnot required·Costfree, forever

What is a moon sign?

Your moon sign is the zodiac sign the Moon occupied when you were born. While your Sun sign reflects your core identity, the Moon governs your inner emotional world — your instincts, moods, comfort needs, and how you nurture yourself and others. The Moon moves quickly, so birth time sharpens accuracy.

Birth data

The four things we need

01collect

Date, time, and place — that's the whole sky. We never store this unless you create an account.

MM / DD / YYYY

24h

24-hour or AM/PM

we'll resolve coordinates & timezone automatically

Country—
Lat—
Lng—
Timezone—

auto-filled from your birth city

Calculations run in your browser. We don't see your data unless you save a chart.

Common questions

Frequently asked questions

  • The Moon sign is the zodiac sign the Moon occupied at the moment you were born. It represents your emotional world, instincts, and subconscious.

Understanding your moon sign

Your moon sign is the zodiac sign the Moon was travelling through when you were born. The Moon is the fastest-moving body in astrology, changing signs every two to two-and-a-half days, so while your birthday narrows it down, your exact time removes any ambiguity on dates when the Moon changed signs.

If the Sun is your conscious identity, the Moon is your emotional foundation — the part of you that reacts before you think. It describes your instincts, your moods, what makes you feel safe, how you process feelings, and the kind of care you give and crave. Many people recognise themselves more in their moon sign than their Sun sign, especially in private or under stress.

Understanding your moon sign explains why you respond to situations the way you do and what you need to feel grounded. Paired with your Sun and rising signs, it completes the 'big three' at the core of your personality. Our calculator finds your moon sign and its house placement instantly, and an AI reading can interpret the Moon's aspects to the rest of your chart for deeper insight.

Companion calculators

Other free tools

Each one zooms in on a different layer of the same chart. Use them together — they share the same birth data.

✦natal

Birth chart

A snapshot of the entire sky at the moment you were born. Sun, moon, planets, twelve houses — drawn in seconds, no signup, no email.

open calculator →
↑ASC

Rising sign

The sign climbing over the eastern horizon at your birth. It shapes how others meet you — your style, your first impression, the mask you do not choose.

open calculator →
☉sol

Sun sign

The sign the Sun was in when you were born. Your core self — vitality, ego, and the way you express who you are.

open calculator →

When you're ready

A calculator gives you the data.
NatalAI gives you a conversation.

Once you know your placements, ask what they mean. Patiently, in plain language, only when you want to.

Begin a reading →