Free Venus and Mars compatibility
Sexual chemistry calculator
This sexual chemistry astrology calculator compares your Venus and Mars signs with theirs, straight from two dates of birth. It reads the four contacts astrologers use for attraction and desire, then tells you what kind of heat you two make.
For any couple, any gender, new crush or long love. No birth time needed.
How the sexual chemistry calculator works
Venus and Mars for each of you. From each birthday we place Venus and Mars where they really were, using the astronomy-engine library on the tropical zodiac.
Four contacts. Your Mars to their Venus, their Mars to your Venus, Mars to Mars and Venus to Venus. Each pair of signs is read as an aspect: same sign, same element, friendly elements, same pace or opposite signs.
One honest band. The two Mars to Venus contacts set the kind of heat: Wildfire, Playful spark, Magnetic, Opposites that spark or Slow burn. No percentages, because nobody can measure chemistry to the decimal.
Just want your own signs first? Try the Venus and Mars sign calculator.
Sexual chemistry astrology: questions people ask
- How does astrology read sexual chemistry?
- Astrologers look at Venus and Mars. Venus is how you love and what attracts you; Mars is how you desire and pursue. When one person's Mars sits in a sign that suits the other person's Venus, the attraction tends to feel easy and strong. This calculator reads that from two dates of birth.
- Which contacts does the sexual chemistry calculator compare?
- Four: your Mars to their Venus, their Mars to your Venus, your Mars to their Mars, and your Venus to their Venus. The two Mars to Venus contacts carry the most weight for attraction. Mars to Mars shows your shared drive and pace, and Venus to Venus shows how your love styles get along.
- What is Venus Mars compatibility?
- Venus Mars compatibility is how one person's Mars sign fits the other person's Venus sign. A same sign or same element pairing reads as easy heat, opposite signs as strong magnetic pull, and signs that share a pace but not an element as hot friction. It is one of the classic ways astrologers read desire between two people.
- Can I check sex astrology by date of birth only?
- Yes. Venus and Mars move slowly, so a date of birth is enough on most days. If one of them changed sign on a birthday you enter, the result says so and shows which sign it was in before and after, so you can check with a birth time.
- Is a "Slow burn" or "Opposites that spark" result bad?
- No. The bands describe the kind of heat, not how good a match is. A slow burn builds rather than bursts, and opposites bring tension that many couples love. This is a guide for reflection and fun, not a score, and no chart can decide who you should be with.
- Does this work for same-sex couples and any kind of relationship?
- Yes. Everyone has a Venus and a Mars, whatever their gender, and the reading is the same for any two people. It works for new crushes, long-term partners and everything in between.
- Do you store the birthdays I enter?
- No. The birthdays and names travel in the result link so the page can show your reading, and they are not saved on our side. If you ask for the email, we keep only your email address and time zone.
Astrology is a tool for reflection and play, not a prediction about anyone you love.
