Free Zodiac & Astrology Sign Calculators​
Discover everything your birth chart has to offer with our full suite of free astrology calculators. Whether you want to find your sun, moon, and rising sign, map out your complete birth chart, or check compatibility with someone else, each tool below gives you accurate, instant results. Just enter your birth date, time, and location. No signup, no fees, no guesswork.
Sun Sign Calculator
Find your sun sign, the core of your personality and identity in astrology.
Moon Sign Calculator
Uncover your moon sign, which reflects your inner emotional world and instincts.
Rising Sign Calculator
Calculate your rising sign to see how the world perceives you at first glance.
Sun Moon Rising Calculator
Also known as your “Big Three,” this calculator reveals your sun, moon, and rising signs together in one report, the fastest way to find your complete astrological identity.
Venus Sign Calculator
Discover your Venus sign to understand your love language and relationship style.
Mars Sign Calculator
Find your Mars sign to learn how you take action, express drive, and handle conflict.
Lilith Sign Calculator
Find your Lilith sign to uncover your raw, untamed instincts and where you express your most authentic self.
Chiron Sign Calculator
Locate your Chiron placement, the “wounded healer” point that shows where you’re meant to grow through past pain.
Part of Fortune Calculator
Find your Part of Fortune, an Arabic Part that points to where you experience natural luck and joy.
North Node Calculator
Calculate your North Node to discover your karmic life purpose and the direction your soul is growing toward.
Vertex Calculator
Calculate your Vertex, a fated point in your chart linked to pivotal relationships and turning points.
Zodiac Sign Compatibility Calculator
Compare any two zodiac signs to see your relationship strengths, challenges, and overall match.
Whether you need a star sign calculator, a zodiac sign chart, or want to know your full zodiac placements, Our free astrology calculators cover everything.
Why Use Our Astrology Calculators?
Every calculator on this page uses precise astronomical calculations (not simplified sun-sign-only guesses) to give you results accurate to the minute of your birth. All tools are completely free, work instantly in your browser, and don’t require an account.
Frequently Asked Questions
What is synastry in astrology?
Synastry is the comparison of two natal charts. It examines how the planets and important points in one person’s chart interact with those in another person’s chart to explore relationship dynamics.
Is a synastry chart the same as a compatibility chart?
They are closely related, but not always identical. A simple compatibility chart may compare zodiac signs, while a synastry chart compares the planetary placements and relationships between two complete natal charts.
What is the best information to use for a synastry chart?
Use the exact birth date, birth time, and birth location for both people whenever possible. Accurate birth times are particularly useful for calculating the Ascendant and houses.
Can I calculate synastry without a birth time?
Yes. You can still compare many planetary positions, but the Ascendant and house placements may be uncertain. An exact birth time provides a more complete chart.
Can synastry show soulmate compatibility?
Synastry can be used to explore strong or meaningful relationship connections, but astrology cannot scientifically prove that two people are soulmates or twin flames.
Is birth chart compatibility accurate?
The mathematical chart calculation depends on accurate birth information. The interpretation itself is an astrological framework and should be used for reflection rather than as a scientific prediction.
What is the difference between synastry and a composite chart?
Synastry compares two individual birth charts and focuses on how the people affect each other. A composite chart creates a separate chart representing the relationship itself.
How do I read a synastry chart?
Start with the Sun, Moon, Mercury, Venus, and Mars. Then examine Jupiter, Saturn, the Ascendant, house overlays, and major aspects. Look at the complete pattern rather than relying on one placement.