DNA Match Calculator
Enter the total shared centimorgans (cM) from your DNA test and see which relationships are possible.
🧬 Enter your shared cM
cM
0930186027903720
Most likely
1st cousin
Typical range 396–1397 cM
All possible relationships at this cM
Sorted by how close your value is to each relationship's average
DNA alone often can't tell these relationships apart — that's why several show up. Your family tree, ages, and which side the match is on narrow it down.
Ranges based on the Shared cM Project (4.0).
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Open the Relationship Calculator →DNA match questions, answered
What is a centimorgan (cM)?
A centimorgan (cM) is a unit that measures how much DNA two people share. The higher the total shared cM, the closer the relationship tends to be. DNA testing companies like AncestryDNA, 23andMe, and MyHeritage report a "total shared cM" number for each of your matches — that's the number you enter above.
Why does one cM number match several relationships?
DNA is inherited randomly, so two people in different relationships can share the same amount of DNA. For example, 229 cM could fit a second cousin, a first cousin twice removed, or a half second cousin. That's normal — the ranges overlap. Your family tree, everyone's ages, and which side of the family the match is on are what finally tell them apart.
How accurate is this estimate?
The ranges come from the Shared cM Project 4.0, a large study of real, documented relationships. They're a very good guide, but they show what's typical — not a guarantee. Distant relationships (third cousins and beyond) especially can share little or no measurable DNA, so they don't always show up in a match list.
Can DNA tell the difference between a grandparent and an aunt or uncle?
Not on its own. A grandparent/grandchild, an aunt/uncle, and a half sibling all share a similar amount of DNA (roughly 1,100–2,500 cM), so their ranges overlap heavily. To choose between them you need ages and known family relationships — for instance, a match old enough to be your grandparent versus one closer to your parent's age.
What does a very high cM number (over 2,400) mean?
Shared DNA that high points to an extremely close relationship — a parent and child, or in the very top range a full sibling or even an identical twin. A parent and child share about 3,400–3,700 cM. If your number is that high, you're looking at immediate family.