Free Birth Chart Calculator

What Your Birth Chart Shows

Your Sun sign is your core identity, your Moon sign is your emotional inner world, and your rising sign (or Ascendant) is how you meet the world and the first impression you give. Together your sun, moon, and rising, the Big Three, are the backbone of your chart. The rest of the planets fill in how you think, love, act, and grow. This calculator also reads your Venus (how you love and what draws you) and Mars (how you pursue and assert yourself) in plain language, not just a label.

Why Your Birth Time Matters

The rising sign changes about every two hours, and it sets the houses that organize the rest of the chart. An accurate birth time gives you an accurate rising sign and house placements. Your Sun and Moon signs are far less sensitive to time, so even without an exact time you will usually get those right.

Sun Sign Is Only the Start

The daily horoscope you read is based on your Sun sign alone. Your full chart, the Moon, the rising sign, the other planets, and the angles between them, is what makes astrology personal. This calculator gives you the placements. A full reading weighs how they interact. For where the science actually stands on all of this, see Is Astrology Real?

Frequently Asked Questions

What is a birth chart?

A birth chart, or natal chart, maps where the Sun, Moon, and planets were at the exact moment and place you were born. It is the foundation of personal astrology, far more detailed than your Sun sign alone.

What are the Big Three in astrology?

Your Sun (core identity), Moon (emotional inner world), and rising sign or Ascendant (how you come across). They are the three placements that shape a chart most, which is why astrologers ask for all three.

How do I calculate my Sun, Moon, and rising sign?

Enter your birth date, exact birth time, and city, and this calculator returns all three at once: your Sun, Moon, and rising sign, the Big Three. Your Sun and Moon stay reliable even with an approximate time, but your rising sign needs an accurate birth time, since it shifts about every two hours.

Do I need my exact birth time?

For your rising sign and houses, yes, because the rising sign shifts about every two hours. Your Sun and Moon are usually correct even without an exact time. If you are unsure of yours, treat the rising sign as approximate.

Is this birth chart calculator free?

Yes, completely free, with no signup. The calculation runs in your browser from your birth date, time, and city. Timezone and historical daylight saving are handled automatically.

What do my Venus and Mars signs mean?

Your Venus sign is how you love, what attracts you, and what you value in a relationship. Your Mars sign is how you act, pursue, and assert yourself, including how you handle drive and anger. This calculator reads both in plain language alongside your Big Three.

What house system and zodiac does it use?

Western (tropical) astrology with whole-sign houses, the same system used across this site. Sidereal or Vedic charts place some planets in different signs and will differ.