Scorpio and Scorpio compatibility sounds like a story about depth, trust and secrets. Sign books call it a deep water match. We asked plain questions instead. How many Scorpio and Scorpio couples does chance make in the US? How close are their birthdays? And what about Mars, the planet that rules Scorpio in the old books?
The first answer comes from 62 million US births. Pair two people born in the US at random, and both come out Scorpio about 1 time in 149. That is a bit less than an even split of signs would give. The Mars answer is the surprise. Two Scorpios born one year apart can never both have Mars in Scorpio. We checked 800 years of sky, and it did not happen once.
This guide gives you the numbers, how we got them, and what the old books say about two Scorpios. Read it as a lens, not a forecast. Astrology is not a science, and no study has shown that a sign predicts how a couple will do.
The quick answer, in six lines
| Question | What we found. |
|---|---|
| How common is a Scorpio and Scorpio couple? | About 1 random US couple in 149, or 0.67 percent. |
| What would an even split give? | 1 couple in 144, a touch more. |
| How close are two Scorpio birthdays? | About 10 days apart on average, and 1 pair in 30 shares a birthday. |
| How many have Suns within 8 degrees? | 46 percent, just under half. |
| How many Scorpios have Mars in Scorpio too? | 14 percent, about 1 in 7. |
| Can both partners have it? | Yes, but never when they are born one, three, five or seven years apart. |
How common is a Scorpio and Scorpio couple?
Most pages on this pair start with a score, such as 90 percent. Nobody says how the score is made, and you cannot check it. So we began with a count you can check: how many people are born under each sign.
Your Sun sign is the slice of the sky the Sun stood in when you were born. Each slice is 30 degrees wide. The Sun takes about a month to cross one. Scorpio season runs from about October 23 to November 21 or 22. The start moves a little from year to year. Our guide to the zodiac signs and their real dates shows in how many years the printed table is off.
We then counted births. Two US data sets gave the same picture.
| Source of the births | Share born Scorpio | Chance a random couple is two Scorpios. |
|---|---|---|
| US births 2000 to 2014, 62.2 million, by exact date | 8.18 percent | 0.67 percent, or 1 in 149. |
| US births 1994 to 2003, 39.7 million, by exact date | 8.11 percent | 0.66 percent, or 1 in 152. |
| If all twelve signs were equal | 8.33 percent | 0.69 percent, or 1 in 144. |
Why not multiply by two, as for a mixed pair? A Scorpio and Pisces couple can form two ways: Scorpio woman and Pisces man, or the other way round. Two Scorpios can form only one way. So the chance is the Scorpio share times itself, 8.18 percent times 8.18 percent.
Among the twelve same sign couples, Scorpio and Scorpio sits in the middle, seventh of twelve. Leo and Leo is the most common, at about 1 in 125. Capricorn and Capricorn is the rarest, at about 1 in 172.
Why Scorpio sits just below an even share
Two things set how many people share a sign. The first is how long the Sun stays in it. The second is how many babies are born per day in that season.
The Sun moves faster in our fall and winter. That is when the Earth is closest to the Sun, in early January, and runs a little faster on its path. So the late fall signs are short. Our page on the Scorpio sign and its season puts Scorpio season at 29.899 days on average. That is 8.186 percent of the year, the fourth shortest of the twelve.
Now the births. US births peak in late summer and early fall, then slow down. By Scorpio season, the daily count is back near the yearly average. So Scorpio’s share of births, 8.18 percent, lands almost exactly on its share of the calendar. The short season sets the number, and the birth rate barely moves it.
One date inside the season stands out. On Halloween, October 31, the US had about 10 percent fewer births than on the days around it, from 2000 to 2014. It ranks among the dozen quietest days of the whole year. The likely reason is that fewer births get scheduled on that day. It is a small dent, but it sits right in the middle of Scorpio.
How close are two Scorpio birthdays?
Here is a question most compatibility pages skip. If two Scorpios meet at random, how many days apart are their birthdays? We measured it from the same 62 million births.
| Gap between the two birthdays, ignoring the year | Share of Scorpio and Scorpio couples. |
|---|---|
| Same birthday | 3.3 percent, about 1 couple in 30. |
| Up to 3 days apart | 22.0 percent, about 1 couple in 5. |
| Up to 7 days apart | 43.7 percent. |
| Up to 14 days apart | 73.4 percent. |
| Up to 21 days apart | 92.0 percent. |
| More than 28 days apart | 0.2 percent, a rare edge case. |
The average gap is 10.0 days. Half of all Scorpio pairs sit 9 days apart or less. The single most likely gap is one day. Each extra day is a little less likely than the one before.
Two random people share a birthday about 1 time in 365. Two random Scorpios share one about 1 time in 30. That is simple math, since both birthdays sit inside one short month. It is a hair more than for two Virgos, whose longer season gives 1 in 31, as our page on the Virgo and Virgo pairing shows.
Same sign, but not always the same Sun
A sign is a 30 degree slice. Two people can share the sign without sharing the Sun’s exact place. A Scorpio born on October 24 and one born on November 20 have Suns about 27 degrees apart.
Astrologers call two points close together in the sky a conjunction. They only count it when the gap is small. The allowed gap is called the orb. So we measured how many Scorpio couples fall inside each orb.
| Orb, the allowed gap between the two Suns | Share of Scorpio and Scorpio couples inside it. |
|---|---|
| 1 degree, near the same birthday | 6.6 percent, about 1 couple in 15. |
| 3 degrees | 19.0 percent, about 1 couple in 5. |
| 6 degrees | 35.9 percent, about 1 couple in 3. |
| 8 degrees, a common choice | 46.1 percent, just under half. |
| 10 degrees, a wide margin | 55.4 percent, just over half. |
These shares match the ones we found for other pairs. Births spread almost evenly inside any sign, so the math comes out the same each time. The point for you is plain. Being two Scorpios does not mean your Suns sit together. At the usual 8 degrees, fewer than half of Scorpio couples have a true Sun conjunction.
A rule of thumb helps. One degree of the Sun is about one day of the calendar. If your birthdays are 8 days apart or less, your Suns are most likely within 8 degrees.
Mars, the ruler both of you share
In the old books, each sign has a ruling planet, a kind of landlord for that part of the sky. Mars rules Scorpio. Pluto was added as a modern ruler after it was found in 1930. We start with Mars, because that is where the numbers get odd.
A planet in the sign it rules is said to be at home. Some Scorpios have Mars at home, in Scorpio. Most do not. We measured the share over 800 years, from 1600 to 2400. Of all the time the Sun spends in Scorpio, Mars is in Scorpio too for 14.21 percent of it. That is about 1 Scorpio in 7.
Our page on Mars in Scorpio covers what that placement means on its own. Here we ask a couple question. What are the odds that both partners have it?
Why the age gap decides it
If you pick two Scorpios from any two years at random, the answer is 14.21 percent times 14.21 percent. That is about 2 percent, or 1 couple in 50. But couples are not drawn from random years. Most partners are born close in age. And for Mars, the exact age gap changes everything.
| Age gap between the two Scorpios | Chance both have Mars in Scorpio. |
|---|---|
| Born the same year | 10.9 percent, about 1 couple in 9. |
| One year apart | Zero, not once in 800 years. |
| Two years apart | 7.8 percent, about 1 couple in 13. |
| Three years apart | Zero. |
| Four years apart | 2.6 percent, about 1 couple in 39. |
| Five years apart | Zero. |
| Six years apart | 0.2 percent, about 1 couple in 440. |
| Seven or eight years apart | Zero. |
| Years picked at random | 2.0 percent, about 1 couple in 50. |
Two Scorpios born in the same fall are five times more likely to share Mars at home than two picked at random. Two Scorpios born one fall apart have no chance at all.
The two year beat of Mars
The reason is the pace of Mars. Mars takes 687 days to go once around the Sun, a little under two years. In one year it covers a bit more than half the sky, about 191 degrees. So if Mars is in Scorpio one fall, it sits on the far side of the sky the next fall. In two years it covers a bit more than a full lap. So two falls later, it can be back near Scorpio.
That is why the Scorpio years come in steps of two. Here are the recent ones.
| Run of years | Falls when Mars shared Scorpio season with the Sun. |
|---|---|
| 1950s and 1960s | 1957, 1959, 1961 and 1963. |
| 1970s | 1972, 1974, 1976 and 1978. |
| Around 1990 | 1989, 1991 and 1993. |
| 2000s | 2004, 2006, 2008 and 2010. |
| 2020s | 2019, 2021, 2023 and 2025. |
| Next run | 2036, 2038 and 2040. |
A year on this list does not mean every Scorpio born that year has Mars in Scorpio. In 1991 and 2023, Mars held Scorpio for the whole season. In 2019 and 1963, it was there only for a few days of it. Your full chart settles it.
Each run spans four to six years, and then Mars stays away for nine or eleven. Across 800 years, the gap between two Mars years was always 2, 9 or 11 years. It was never 1, 3, 5 or 7. That is the whole pattern in the table above.
What that means for a Scorpio couple
In the old books, Mars sets how a person acts on a want and how they fight. At home in Scorpio, Mars was read as strong and steady, a planet that does not quit halfway. So a couple where both have Mars in Scorpio would be read as two people who push the same way, and push hard.
Most Scorpio couples are not like that. About 3 in 4 couples of random years have neither Mars in Scorpio. Their Mars sits in some other sign, with its own pace. That is one more reason the Sun sign alone says little about how two people fight or make up.
Pluto, the modern ruler, and a generation
Modern astrologers gave Scorpio a second ruler, Pluto. Pluto moves so slowly that a whole generation shares its sign. Our page on Pluto in Scorpio dates its stay: from November 5, 1983, to November 10, 1995, with one short step back.
So every Scorpio born in the falls of 1984 to 1994 has Pluto in Scorpio as well. In 1983 and 1995, it depends on the exact day. For a couple of that age, Pluto at home is shared by both, whatever their age gap. Mars is the picky ruler here. Pluto is the one that gives it to a whole decade.
What the old books say about Scorpio with Scorpio
The Greek astronomer Claudius Ptolemy wrote the Tetrabiblos in the second century. It is one of the founding textbooks of Western astrology. In Book 1 he sorts the signs in several ways. Two Scorpios match on every one of them.
| Grouping in the Tetrabiblos | Where Scorpio falls. |
|---|---|
| Gender | Feminine, one of the six night signs. |
| Element group | The water triangle with Cancer and Pisces. |
| Ruler of that group | Mars, because of Scorpio. |
| Kind of season | Solid, the settled middle of fall. |
| House ruler | Mars, which also rules Aries. |
| Exalted planet | None, Scorpio hosts no planet of honor. |
Exalted means honored, a place where a planet is said to act at its best. The sign opposite is its fall, where it is weakest. The Moon is exalted in Taurus, so she falls in Scorpio. William Lilly, in Christian Astrology of 1647, keeps that rank. So a Scorpio couple shares a sign that the old books call hard on the Moon, the planet of moods and comfort.
Ptolemy counts four aspects, or angles, between signs: opposition, trine, square and sextile. Two planets in the same sign form none of them. Later writers call that link a conjunction. Hellenistic astrologers, as Chris Brennan explains in his book on that period, called it being present together. It is a bond of shared space, not of angle.
Ptolemy’s other links pair Scorpio with other signs, not with itself. Signs that “behold” each other have days of the same length. Read sign by sign, as the Robbins translation notes, Scorpio beholds Pisces. Read degree by degree, as Lilly did with his mirror points, Scorpio mirrors Aquarius. Either way, the partner is another sign. Our page on the Pisces and Scorpio pairing covers the first of these.
So in the old system, the bond of a Scorpio couple is sameness itself. Same ruler, same element, same season. Nothing pulls against it, and nothing adds a second voice.
What a census of ten million marriages found
A birth count tells you how common the pair is. It does not tell you if like attracts like. The best test we know is British. In 2007, the sociologist David Voas looked at every married couple in England and Wales in the 2001 census. That was 10.3 million couples, with the birth dates of both partners. His paper is titled “Ten million marriages: a test of astrological love signs.” The Skeptical Inquirer ran a version in March 2008.
His first table crossed the sign of each husband with the sign of each wife.
| Scorpio husband and Scorpio wife, 2001 census | Couples. |
|---|---|
| Found in the raw table | 61,101 couples. |
| Expected if signs play no part | 59,511 couples. |
| Extra couples | 1,590 couples, or 2.7 percent more. |
| After Voas cleaned the data, Table 7 | 54,992 couples, against about 54,886 by chance. |
Read on its own, the raw table says Scorpios marry Scorpios a little more than chance. Every same sign pair showed the same small excess, and Scorpio ranked seventh of twelve. Voas traced it to the census form, not the stars. One person fills in the form for the house, and some wrote their own birthday for their spouse too. Our page on the Virgo and Virgo pairing tells that story step by step.
After the clean up, the Scorpio cell sits within 0.2 percent of chance. Scorpios do not seek each other out, and they do not avoid each other.
Two Scorpios in daily life
Here is how the style looks when it meets itself. These are sign portraits from the tradition, not facts about any person you know.
Scorpio, as a solid water sign, is read as slow to trust and slow to let go. It likes to know what is under the surface. It keeps its own counsel and guards what it loves.
Put two of them together and you get a pair that takes loyalty as the ground rule. Neither one needs the talk to stay light. Both can sit with a hard subject. Sign books cast this pair as two people who keep each other’s secrets.
The same trait cuts two ways. Two guarded people can wait for the other to go first. A slight can sit unspoken for weeks. The fix is not to stop guarding. It is to agree on what gets said out loud, and when.
The Sun sets the direction, and other planets set the daily weather. What each partner finds lovely is a Venus question, not a Sun one. Our page on Scorpio and Scorpio Venus signs covers that side.
Where the friction shows up
With the same sign on both sides, the snags come from too much of one thing, not from a clash. Here are four common ones from the sign books, with a small step for each.
| Where it snags | What one Scorpio feels | What the other Scorpio feels | A small step that helps. |
|---|---|---|---|
| Trust | Safe only once the other shows all | Safe only once the first shows all | Take turns sharing one small thing first. |
| Silence | Calm while thinking a hurt through | Shut out by the quiet | Name the pause: “I need a day, then we talk.” |
| Control | Steady when holding the plan | Boxed in by the plan | Split the choices by area, not by mood. |
| Old hurts | Sure the matter is closed | Sure it was never solved | Agree when a topic is done, and say it. |
None of these steps needs a chart. Any two careful people can use them. That is the honest point: the sign gives a name to a pattern, and the fix lives in plain talk.
The rest of the chart counts for more
A Sun sign is one point in a chart with at least ten. Astrologers who compare two charts, a method called synastry, look at all of them. Three matter most for love.
The Moon shows what makes a person feel safe. The Venus sign shows what they find lovely and how they show care. Mars shows how they chase what they want and how they argue. As the Mars table shows, two Scorpios born a year apart never share Mars in Scorpio.
So one Scorpio can have a Gemini Moon and a Libra Venus. The other can have a Taurus Moon and a Sagittarius Venus. Each of those changes the picture more than the shared Sun does. If you know both birth dates and times, the full chart is where the detail lives. If you only know the Sun signs, treat this page as a starting map, not the ground.
How we measured
Birth shares come from real daily counts. We took US births for every date from 2000 to 2014, 62.2 million in all, from the Social Security Administration file. We checked them against the 1994 to 2003 file of the National Center for Health Statistics. Both were compiled by the site FiveThirtyEight. For each date we placed the Sun with exact entry times into each sign, in US Central time. A day on the cusp was split by the share of hours on each side.
The birthday gaps and orbs used two routes. Route one took the 2000 to 2014 births and placed the Sun with the Swiss Ephemeris, 96 times per day. It paired every Scorpio with every other Scorpio, weighted by births. Route two took the 1994 to 2003 births and a second code library, Astronomy Engine, at 48 steps per day. Both gave a 10.0 day average gap, a shared birthday in 1 pair in 30, and 46 percent within 8 degrees.
The Mars figures cover 1600 to 2400. Route one checked the Sun and Mars every hour with the Swiss Ephemeris. Route two checked them every three hours with Astronomy Engine. Both gave 14.21 percent. For each fall, we took the share of Scorpio season with Mars in Scorpio. The chance for a couple is that share for one year times the share for the other, averaged over all pairs of years with the same gap. Both routes found zero for gaps of one, three and five years.
The census counts come from the Voas paper, Tables 1 and 7. The paper is online at magonia.com. The Ptolemy notes follow the Loeb edition translated by F. E. Robbins, Book 1.
The limits are real. Birth shares are not the same as shares of adults who date. People move, and many couples meet across borders. The Mars figures weigh each hour the same, not each birth. They are a close guide, not an exact census of couples.
Questions people ask
Are two Scorpios compatible?
No study has found that Sun signs predict how a couple does. The largest test, over ten million marriages in England and Wales, found no real pull between Scorpios once form errors were removed. As a symbol, the pair shares one ruler, Mars, and one element, water.
What percentage of couples are both Scorpio?
About 0.67 percent of random US pairings, or 1 in 149, based on 62.2 million US births from 2000 to 2014. An even split of signs would give 1 in 144.
Can two Scorpios both have Mars in Scorpio?
Yes. About 1 Scorpio in 7 has Mars in Scorpio. For two Scorpios born the same year, both have it about 1 time in 9. For two born one, three or five years apart, it never happens, because Mars is on the far side of the sky a year later.
What are the odds that two Scorpios share a birthday?
About 1 couple in 30, against 1 in 365 for two random people. The average gap between two Scorpio birthdays is about 10 days.
Who rules Scorpio, Mars or Pluto?
Mars in the old books, from Ptolemy to Lilly. Pluto was added after 1930. Every Scorpio born in the falls of 1984 to 1994 has Pluto in Scorpio.
Do I need a full chart to judge a Scorpio and Scorpio match?
For any real detail, yes. The Moon, Venus and Mars signs of both partners say more about daily life than the shared Sun sign.
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