Venus and Mars Sign Calculator
In astrology Venus describes how you love and what you value, and Mars how you act and pursue what you want. Enter a birth date to find both signs, computed from real planetary positions.
For entertainment and self-reflection: The planetary positions are real; the love and drive descriptions are astrological symbolism offered for fun and reflection. Nothing on this page is a prediction, and it is not financial, medical, psychological or legal advice. Use it as a prompt for thought, not as a basis for decisions.
Find Venus and Mars signs
How the calculator works
Venus and Mars move through the zodiac at very different speeds. Venus, closer to the Sun than Earth, is never more than about 47 degrees from the Sun in our sky and usually spends about four weeks in each sign, though a retrograde period can keep it in one sign for up to four months. Mars, the next planet out from Earth, takes about two years to go around the zodiac and typically spends six to seven weeks in a sign, or more than six months when it turns retrograde.
The calculator uses Astronomy Engine, an open-source implementation of the VSOP87 planetary theory, to compute the geocentric ecliptic longitude of each planet at your birth, measured from the true equinox of date (the tropical zodiac used in Western astrology). We verified the engine against NASA JPL Horizons at six different dates: Venus and Mars matched to within a fraction of an arcminute every time. Then it scans backwards and forwards to find when each planet entered and left the sign, so you can see how close to a boundary you were, and it checks whether the planet was retrograde.
If either planet was within a degree of a sign change, the result tells you so. That is the only situation where birth time matters; otherwise noon is accurate enough.
Worked example
Take a birth date of October 2, 1992. The calculator places Venus in Scorpio and Mars in Cancer. In the traditional reading that is someone who loves deeply and privately (Venus in Scorpio) and who acts to protect home and family (Mars in Cancer). Mars was spending an unusually long time in Cancer that year, from mid-September 1992 to late April 1993, because it turned retrograde in the winter. Compare that with Venus, which raced through Scorpio in a few weeks. Try a date six weeks later and Venus will have moved on, while Mars is still in Cancer.
Venus signs at a glance
| Venus in | Traditional theme in love and values |
|---|---|
| Aries | shows affection directly and quickly, loves the chase and honesty |
| Taurus | values loyalty, comfort and touch; slow to warm, steady once committed |
| Gemini | falls for wit and conversation; needs variety and mental play |
| Cancer | loves through care and protection; needs emotional security |
| Leo | generous and romantic; enjoys grand gestures and admiration |
| Virgo | shows love through practical help and attention to detail |
| Libra | seeks harmony, partnership and beauty; a natural diplomat in love |
| Scorpio | loves deeply and privately; values trust and intensity |
| Sagittarius | wants a partner in adventure; values freedom and honesty |
| Capricorn | loyal and serious about commitment; shows love by building a future |
| Aquarius | values friendship and independence in love; drawn to the unusual |
| Pisces | romantic, compassionate and idealistic; loves without conditions |
Mars signs at a glance
| Mars in | Traditional theme in action and drive |
|---|---|
| Aries | acts fast and directly; energised by competition |
| Taurus | slow to start, unstoppable once moving; works best steadily |
| Gemini | acts through words and ideas; juggles many projects |
| Cancer | driven to protect home and family; acts on feelings |
| Leo | bold and dramatic; motivated by pride and creativity |
| Virgo | precise and hard-working; drive comes out as skilled effort |
| Libra | prefers cooperation; motivated by fairness, can hesitate |
| Scorpio | intense, strategic and persistent; never forgets a goal |
| Sagittarius | restless and enthusiastic; driven by ideals and adventure |
| Capricorn | disciplined, ambitious and patient; plays the long game |
| Aquarius | acts for causes and ideas; independent and unconventional |
| Pisces | works through intuition and imagination; avoids direct conflict |
A little history
Venus and Mars have been paired in myth and astrology for thousands of years. The Babylonians identified the bright planet Venus with Ishtar, goddess of love and war, and kept detailed records of its appearances, including the famous Venus Tablet of Ammisaduqa. The red planet was linked with Nergal, a god of war and plague. The Greeks inherited both associations as Aphrodite and Ares, the Romans as Venus and Mars, and their love affair is one of the best-known stories in Ovid and Homer. The symbols ♀ and ♂, now used in biology for female and male, began as astronomical signs for these two planets.
In traditional astrology Venus was the "lesser benefic", linked with pleasure, beauty, harmony and partnership, and Mars the "lesser malefic", linked with heat, conflict, courage and drive. Modern psychological astrology softens that language and treats Venus as how you attract and value, and Mars as how you assert and pursue. The popular habit of comparing partners' Venus and Mars signs owes a lot to twentieth-century relationship astrology and, indirectly, to the cultural shorthand of "men are from Mars, women are from Venus", although astrologers apply both planets to everyone regardless of gender.
Using your signs for reflection
A useful way to play with these placements is to compare the two with what you actually do. Read your Venus description and ask: is this how I show affection, or is it how I would like to be loved? Read your Mars description and ask: when I want something, do I go after it like this, or do I hold back? Partners and close friends can compare signs as a light-hearted way into a conversation about love languages, conflict styles and motivation. You do not need to believe planets shape behaviour to find the questions useful.
A practical observation: since Venus and Mars move faster than the outer planets, people born only a few weeks apart can have different Venus signs, even if they share a sun sign. That variety is part of the fun of comparing charts at a party.
Retrograde Venus and Mars
About every 19 months Venus appears to move backwards for around six weeks, and about every 26 months Mars does so for around ten weeks. This apparent backward motion happens when Earth overtakes Mars, or when Venus overtakes Earth, on their orbits. Being born with Venus or Mars retrograde is fairly common (roughly 7 percent and 9 percent of birth dates respectively). Astrologers interpret it as a more inward or reflective expression of that planet. The calculator flags it if it applies to you.
Frequently asked questions
What is my Venus sign?
Enter your birth date above. The calculator finds where Venus was in the zodiac on that day. Your Venus sign is often in the same sign as your Sun or within two signs of it, because Venus never strays far from the Sun.
What does my Mars sign mean?
In astrology Mars represents drive, energy, ambition and how you handle conflict. Each sign gives it a different style, from the direct Aries Mars to the strategic Scorpio Mars.
Do I need my birth time to find my Venus or Mars sign?
Usually not. Venus and Mars change sign only every few weeks. Birth time only matters if the calculator shows that the planet was within about a degree of a sign change on your birth date.
Can Venus be in a different sign from my sun sign?
Yes. Venus can be up to about 47 degrees from the Sun, so it can be in your sun sign or up to two signs either side of it.
What does it mean if Venus or Mars was retrograde when I was born?
It means the planet appeared to move backwards from Earth's point of view at your birth. Astrologers read it as a more inward expression of that planet's themes. It is fairly common.
Are Venus and Mars signs used in relationship compatibility?
Yes. Relationship astrology often compares one partner's Venus with the other's Mars. Studies have found no real-world compatibility effect, so treat it as a conversation starter.
Sources and further reading
- Astronomy Engine by Don Cross (MIT licence); positions verified with NASA JPL Horizons, ssd.jpl.nasa.gov/horizons.
- NASA Science, "Venus: Facts" and "Mars: Facts", science.nasa.gov.
- Wikipedia: "Venus in culture", "Mars in culture", "Venus tablet of Ammisaduqa", "Apparent retrograde motion".
- Ovid, Metamorphoses IV; Homer, Odyssey VIII (the story of Ares and Aphrodite).
- Campion, N. A History of Western Astrology, 2 vols, Continuum, 2008–2009.
By Stanley King · About 8calc · Last reviewed October 2026