A Cosmic by Design Experience

    Free Big 3 Astrology Calculator

    Discover Your
    Big 3

    Find your Sun, Moon, and Rising signs with the free Big 3 Astrology Calculator. Receive a personalized written reading that speaks to your essence, emotions, and how you move through the world.

    Start with your cosmic core. Your Sun. Your Moon. Your Rising.

    Free. Beginner friendly. Takes just a minute.

    What is the Big 3 Calculator?

    Big 3 Calculator is a free astrology tool created by Cosmic by Design. Enter your birth date, birth time, and birth location to calculate your Sun, Moon, and Rising signs and receive a personalized introduction to how these three placements show up together.

    Your Sun speaks to core identity, your Moon to your emotional inner world, and your Rising sign to how you meet the world.

    Understanding Your Cosmic Foundation

    Your Sun Sign

    The essence of who you are. Your core identity, ego, and the energy you radiate into the world.

    Your Moon Sign

    Your emotional inner world. How you process feelings, seek comfort, and nurture yourself and others.

    Your Rising Sign

    The face you show the world. Your first impression, approach to life, and how others perceive you.

    What You'll Receive

    A personalized reading crafted specifically for your unique cosmic blueprint.

    Your Sun, Moon, and Rising described in clear, grounded language

    How these parts of you interact — and sometimes pull in different directions

    Where timing tends to land most strongly for you

    A reading designed to be revisited, not rushed

    Astrology helps you make sense of yourself… and the people in your life… so you can move with clarity instead of confusion and meet people where they actually are.

    — Cosmic by Design

    Free Calculator vs. Full Big 3 Reading

    Free Big 3 Calculator

    The free calculator identifies your Big 3 and gives you a personalized introduction to each placement and how they begin to work together.

    Full Big 3 Reading

    The Full Big 3 Reading is a personalized 1:1 interpretation of your unique Sun, Moon, and Rising combination, with space to explore your strengths, patterns, inner dynamics, and questions in more depth.

    New to astrology? Start with our Big 3 guides.

    Frequently Asked Questions

    A Big 3 astrology calculator helps you find your Sun sign, Moon sign, and Rising sign using your birth date, birth time, and birth location. These three placements are often used as a starting point for understanding your personality, emotions, and how you show up in the world.

    The Big 3 signs are your Sun sign, Moon sign, and Rising sign. Your Sun sign speaks to your core identity. Your Moon sign speaks to your emotions and inner world. Your Rising sign speaks to your outer expression and how you move through the world.

    Your Sun sign speaks to your character, vitality, and self-expression. It reflects your core identity and the part of you learning to shine.

    Your Moon sign speaks to your emotions, intuition, instincts, and need for care. It can help you understand what makes you feel safe and how you process your inner world.

    Your Rising sign speaks to how you show up in the world. It reflects your first impression, outer expression, and the energy people often meet first.

    Yes. Your birth time is especially important for calculating your Rising sign. The Rising sign changes about every two hours, so the more accurate your birth time is, the more accurate your Big 3 result will be.

    You may still be able to find your Sun sign and Moon sign without an exact birth time, but your Rising sign usually needs a birth time to be accurate. If you do not know your birth time, check your birth certificate or ask a family member if possible.

    You may not relate to your Sun sign because your chart is more than one placement. Your Moon sign, Rising sign, and other parts of your birth chart can shape how you feel, react, connect, and move through life. Your Big 3 gives you a fuller starting point.

    Yes. The Big 3 Astrology Calculator is free to use and beginner friendly.

    After you find your Big 3, start by learning what your Sun, Moon, and Rising signs mean together. You can revisit your reading anytime and use it as a foundation for exploring the rest of your birth chart.