Your Mars sign is the sign of the zodiac Mars was passing through when you were born. In astrology, Mars governs drive, action, and desire: how you go after what you want, how you fight, what makes you feel alive, what you find magnetic. Where Venus is what you love and how you receive, Mars is what you chase and how you push.
Enter your birth date (and optionally a city for the timezone). We compute Mars's actual ecliptic longitude from a geocentric ephemeris, accurate to better than a tenth of a degree. Your Mars sign appears in the personal-planets section of the chart below.
What Mars governs in your chart
Mars is the fourth planet from the Sun and orbits roughly every 687 days, so it spends about 6 to 7 weeks in each sign on average (longer when it's retrograde, which can stretch a single sign up to 7 months). Astrologically, Mars is the assertion-and-action planet, the part of you that wants, that pursues, that competes, that gets things done.
A Cancer Mars protects what it loves and acts in self-defense more than in conquest. An Aries Mars is direct, fast, and impatient, the "blueprint" Mars in its home sign. A Capricorn Mars is patient and strategic, building toward goals over years. A Pisces Mars works obliquely and dissolves obstacles rather than confronting them.
Mars and how you fight, flirt, and finish
Astrologers often look at Mars for three specific questions: how do you handle conflict, what kind of pursuit feels natural to you, and how do you sustain energy on long projects? The sign of your Mars hints at all three. Mars in fire signs (Aries, Leo, Sagittarius) tends to act in bursts; Mars in earth signs (Taurus, Virgo, Capricorn) acts steadily; Mars in air signs (Gemini, Libra, Aquarius) acts through ideas and relationships; Mars in water signs (Cancer, Scorpio, Pisces) acts through emotion and intuition.
For the rest of the chart (Sun, Moon, Rising, houses), use our birth chart calculator.
Key takeaway
Your Mars sign is the zodiac sign Mars was in at your birth. It governs drive, action, and desire, how you pursue, fight, and sustain energy. Mars stays in each sign about 6-7 weeks; date alone is usually enough.
Source: Astronomy Engine (geocentric ephemeris) for Mars's ecliptic longitude
Examples
Born September 5, 1985 in Cleveland, Ohio
- Birth date 1985-09-05
- Birth time (optional)
- Birth location (optional) Cleveland, Ohio, United States
Mars was well inside Capricorn for early September 1985, no boundary-day worries. Date alone is enough; Mars moves about half a degree per day, well inside any sign's 30° width.
Born July 14, 1992 in Tokyo, Japan
- Birth date 1992-07-14
- Birth time (optional) 10:00
- Birth location (optional) Tokyo, Japan
Mars was in Taurus through most of July 1992, a placement astrologers associate with steady, sensual, hard-to-budge drive. With Tokyo's JST offset (UTC+9), the calculator converts to UTC before computing Mars's position, so the result matches what any professional astrology software using the same ephemeris would produce.
Frequently asked questions
How long does Mars stay in one sign?
On average, about 6 to 7 weeks. The exception is when Mars is retrograde, when it appears to move backward against the stars from Earth's vantage point. Mars goes retrograde roughly every 25 months for about 60-80 days, and during a retrograde period Mars can revisit a sign it just left. As a result, Mars can spend up to 7 months in a single sign across a retrograde cycle. The calculator handles all of this automatically; the result you see is Mars's actual ecliptic longitude on your birth date.
Mars went retrograde when I was born. What does that mean?
If your natal Mars is retrograde, astrologers often read it as a more inwardly directed Mars: drive that's quieter on the surface, slower to express itself outwardly, sometimes more competitive with oneself than with others. It's not a "weaker" placement, just a differently routed one. The calculator identifies the sign of your Mars, which is the headline placement; retrograde status is a secondary modifier and is shown as a small label in the full birth chart, alongside Mercury, Venus, and Jupiter retrograde flags.
I'm gentle, but my Mars is in a "fiery" sign. Is something off?
Probably not. Mars describes the shape of your drive when it's engaged, not the volume of it in daily life. A gentle person with Mars in Aries can show that Mars in concentrated bursts (a sport, a creative deadline, a moment of advocacy) and otherwise be calm. Other parts of the chart, especially the Sun, Moon, and Rising, govern how often that Mars shows up to the surface. Reading Mars in isolation always loses context; it's most useful alongside the full chart.
How is Mars different from my Sun or Moon sign?
Your Sun is your core identity, your Moon is your inner emotional life, and your Mars is your drive. They answer different questions. Sun: who am I? Moon: what soothes me? Mars: what do I chase? People sometimes confuse Mars with the Sun because both feel like "me in action," but the Sun is the steady-state self while Mars is the in-motion self. Looking at all three together is more useful than any single placement, the full birth chart calculator shows them side by side.