Free tools
Calculators
Every tool here is deterministic, versioned and offline-capable. No account, no upload, and no result presented as more certain than it is.
DISCOVERY TOOL
Shared cM Calculator
Turn a shared centimorgan number into a ranked list of possible relationships.
Let’s figure it out DISCOVERY TOOLRelationship Calculator
Name the relationship between two people from their positions in a family tree.
Let’s figure it out DISCOVERY TOOLCousin Calculator
Work out cousin degree and how many times removed, with the path shown.
Let’s figure it out DISCOVERY TOOLDNA Percentage Calculator
Convert between percentages, centimorgans and relationships.
Let’s figure it out DISCOVERY TOOLInheritance Calculator
Project how much DNA you expect to carry from a specific ancestor.
Let’s figure it out DISCOVERY TOOLExpected cM Range
Look up the expected centimorgan range for any relationship.
Let’s figure it outShared principles
What every calculator on this site does
- Shows the range, not only the headline number.
- Names the dataset version behind every figure.
- Refuses to describe a single cM value as a confirmed relationship.
- Validates input and explains what went wrong rather than silently producing nonsense.
- Works with the keyboard, with a screen reader, and without colour as the only signal.
- Sends nothing anywhere.
