Mangal dosha, also called being manglik, is a positional test: it asks whether Mars falls in certain houses of your chart. The calculator above runs it from all three classical reference points and under both house sets, because those disagree with each other and the disagreement is usually hidden.
It also reports how common the condition is. That number is not a side note. It is the difference between a finding and a horoscope column.
The test
Count houses from the lagna. If Mars sits in the 1st, 2nd, 4th, 7th, 8th or 12th, the chart is manglik.
That is the whole thing, in the most common formulation. Six houses of twelve.
Read that last sentence again, because it does all the work. Six of twelve is half. Before anything about your particular chart is considered, before any planet is looked at except Mars, the test as usually stated selects roughly half of all human beings.
That is not an argument, it is arithmetic, and it is measurable rather than assertable. Running the test over three thousand real charts spread across sixty-five years gives 50.0%.
Checking the fifty per cent for yourself
You do not have to take the measurement on trust, because the reasoning is short enough to follow.
Mars occupies one of twelve signs. Your lagna occupies one of twelve signs. The house Mars falls in relative to the lagna is the difference between those two, counted round the circle, which gives a number from one to twelve.
Now, are those two positions independent? Close enough. Mars takes about two years to cross the zodiac and the lagna takes two hours, so for any large collection of birth moments the two are effectively uncorrelated. Every one of the twelve possible house numbers therefore comes up about one time in twelve.
Six of those twelve are on the counted list. Six twelfths is one half.
That is the whole argument, and it needs no assumption about whether astrology works. It is a statement about how two roughly independent positions combine, and it would hold identically for any six houses chosen out of twelve. The measured 50.0% over three thousand charts is simply confirmation that nothing unexpected is going on.
Then it gets larger
Many traditions do not count from the lagna alone. They count from the Moon as well, and from Venus, and treat Mars in a counted house from any of the three as sufficient.
Each reference point is a fresh draw at roughly even odds. Requiring only one of three to hit takes the rate up sharply. Measured over the same three thousand charts: 88.3%.
Under the common three-reference test, about seven people in eight are manglik.
A category that includes seven eighths of the population is not identifying an affliction. It is very close to describing the human condition, and it is the single most useful thing to know before paying anyone to correct it.
The tool reports each reference point separately, so you can see which ones fired and which did not. On the example chart, Mars is unafflicted from the lagna and from the Moon, and afflicted only from Venus. A site reporting the lagna alone would call that chart clean. A site reporting all three would call it manglik. Same chart, same Mars, opposite conclusions, and neither has miscomputed anything.
The second house is contested
There is a further split, and it is the one that most often explains two sites disagreeing.
North Indian practice usually counts the 2nd house. Several South Indian lineages do not, counting only the 1st, 4th, 7th, 8th and 12th. That single house is one twelfth of all charts, so about one person in twelve is manglik under one tradition and not the other, purely on where they happen to have been taught the rule.
The calculator runs both sets and tells you explicitly when they disagree about you. It does not pick one, because there is nothing in the astronomy to pick with. This is a doctrinal difference, not a computational one.
What the tradition itself says next
The classical literature is a good deal more careful about this than the internet is, and the care mostly lives in the cancellations.
Parihara is the body of conditions under which the dosha does not apply. There are many, and they are quoted far less often than the affliction is. Some are purely positional and can be checked from a chart alone:
- Mars in its own sign, Mesha or Vrischika
- Mars exalted in Makara
- Mars in Simha or Dhanu, signs of the Sun and Jupiter
- Mars debilitated in Karka, which several sources treat as cancelling
Others depend on aspects, on which dasha is running, or on the other chart when two are being matched. The calculator applies only the positional ones and says so, rather than half-implementing the rest and presenting the result as complete.
The pattern is worth noticing on its own. A rule that catches half the population, followed by a long list of exemptions, is a rule doing very little separating. If you are told you are manglik, the next question is not what to do about it but which of the cancellations apply, and that question is asked much less often than it should be.
A note on the three-reference arithmetic
The jump from 50% to 88% is worth a moment, because it is not obvious that adding two more tests should push it that far.
If the three reference points were fully independent, the chance of failing all three, and so being clean, would be one half cubed, which is one eighth. That would make 87.5% manglik. The measured figure is 88.3%, which is close, so in practice the three references behave nearly independently.
They are not perfectly independent, and it is easy to see why not. The Moon and the lagna are unrelated. But Venus never strays far from the Sun, and neither does Mercury, so charts have internal correlations that make some house combinations slightly more common than others. Those correlations shift the figure by about a percentage point and no more.
The important part is the structure rather than the exact number. Each additional reference point is another near-even chance to be caught, and requiring only one hit out of several is a very effective way of catching nearly everybody. Any test built that way will produce a high positive rate no matter what it is testing for.
Where the practical harm sits
This matters more than most chart features because it is used to make decisions about people.
Two things get built on the label. The first is a remedy market: pujas, gemstones, rituals, fasts, each sold as a correction for a condition most people have. The second, and worse, is matchmaking, where a manglik reading is used to refuse a match, or to require that a manglik person marry only another manglik person.
Against a base rate near ninety per cent, both of those collapse. If nearly everyone is manglik, then requiring manglik-to-manglik matching excludes almost nobody, and a remedy for a near-universal condition is a remedy for being alive. If you are on the receiving end of either, the base rate is the fact to have in hand.
This page will not tell you what to do with that. It will give you the number, both house sets, all three reference points, and the cancellations that apply, so that whatever you decide is decided with the arithmetic in front of you.
Why another site gives a different answer
None of these are computational disagreements. Every site is looking at the same Mars, in the same place, to the same arcsecond.
How many reference points. Lagna only is the most common and the most lenient. Adding the Moon and Venus roughly doubles the hit rate.
Whether the 2nd house counts. Worth one chart in twelve on its own.
Which cancellations are applied, if any. Many sites apply none, which maximises the number of people told they have a problem.
The ayanamsa. This is the one genuinely astronomical difference, and it is small. Lahiri and Raman are about 1.45° apart, so it only matters when Mars sits within that distance of a sign boundary, which is roughly one chart in twenty.
The birth time, because two of the three reference points are the lagna and the Moon. An hour of error moves the lagna about fifteen degrees, which can change the house Mars occupies relative to it. The Moon reference is far more forgiving, since the Moon holds a sign for over two days, so a rough birth time degrades the lagna reading long before it touches the Moon one.
There is a useful consequence buried in that last point. If a site gives you a manglik reading from a birth time you know is approximate, ask which reference point fired. If it was the Moon or Venus, the reading is robust to your uncertainty. If it was the lagna alone, it may not survive a twenty-minute correction, and it is worth recomputing before anyone acts on it.
Reading your own result
Three questions, in order.
Which reference points fired? One of three is a much weaker finding than three of three. The tool separates them; most do not.
Does a cancellation apply? If Mars is in Mesha, Vrischika or Makara, several classical authorities say the dosha does not operate at all, and that is checkable in a second.
What is the base rate for the test being applied to you? Half for the lagna alone. Near ninety per cent for the three-reference version. Whatever else is true, a positive result places you in a very large group.
Where the rule may have come from
Worth saying plainly: nobody knows, and anyone who tells you confidently is guessing.
What can be observed is the shape of the counted houses. The 1st, 4th, 7th and 10th are the kendras, the angular houses, and three of those four are on the list. The 8th and 12th are among the dusthanas, the houses classically treated as difficult, and both are on it. The 2nd, the contested one, belongs to neither group cleanly, which may be exactly why it is the one traditions disagree about.
So the list is not arbitrary; it is drawn from house categories that already existed. But that is a statement about internal consistency, not about origin. The texts that carry the rule carry it as received doctrine rather than as a derivation, and no surviving source explains why Mars specifically, or why those houses and not the other dusthanas.
That gap matters for how much weight the rule can bear. A rule with a stated derivation can be checked against its own reasoning. A rule received without one can only be checked against the world, and the check available here is the frequency: a test that catches seven people in eight is not, whatever its provenance, doing much work.
What this page will not do
It will not tell you whether to marry someone.
What it computes is the sign Mars occupies, the house that puts it in relative to three different reference points, whether those houses fall in either of two documented sets, and which positional cancellations apply. Every one of those is arithmetic on a planetary longitude you can verify against any ephemeris.
What it will not do is dress a coin flip up as a diagnosis. The tradition contains this test and contains its cancellations, and reporting the first without the second, or either without the frequency, produces something that sounds far more specific than it is.