Fifteen minutes · no DNA kit
It runs in your family.
Are you next?
Draw the family tree. See your chance of carrying it — and of developing it. A number for this family, not a textbook 50%.
No test, no saliva kit, no waiting for a lab. If you know who is affected, you can start now.
Start now · no account · 12,867 conditions
Your chance of carrying it
31%
Down from the textbook 50% — because you are 38 and still well, and because your aunt reached 68 without it.
You are probably here because
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A parent was diagnosed
And nobody has told you what it means for you, or for your children.
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It keeps coming back
A grandparent, an aunt, a cousin. Too many for coincidence, and no one can say what it is.
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Your sibling has it and you do not
You want to know whether you are a silent carrier before you start a family.
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You and your partner are related
Or you share ancestry, and you have been told to "be careful" without a number attached.
In every one of these, the answer is already sitting in your family — in who has the condition, who does not, and how old they got to without it. It just has to be worked out.
Three steps, about fifteen minutes
- 1
Draw your family
Click to add parents, siblings, aunts, cousins — as far back as you can remember. Nothing has to be complete.
Five minutes
- 2
Say who is affected
Mark who has the condition, roughly what age it started, and how old everyone is now. "I don't know" is a valid answer everywhere.
Five minutes
- 3
Read your numbers
Which condition best fits the family, your chance of carrying it, and your chance of developing it at the age you are today.
Straight away
Building the tree and seeing which condition fits is free, with no account. Per-relative carrier and onset probabilities are the paid part — $20, once.
See pricingThe relatives who are well are evidence too. An uncle who reached seventy without symptoms changes your number. An uncle who is twenty barely moves it.
Why your family tree gives a real answer
Most of what you find online gives you the textbook figure — "50% if a parent has it" — and stops. That number ignores your actual family, and your actual family is the evidence.
The shape of the family says which condition it is. Three generations in a row affected points somewhere completely different from one affected child of healthy cousins — even when the symptoms are identical. That is worked out first, then your own odds are calculated from it.
Underneath, this is the same class of probability calculation a genetic counsellor does by hand — run across the whole family at once, against large-scale genetic data. The method, evidence and limits are written up in full if you want to check them.
The same family, two unaffected uncles
Uncle, 71, no symptoms
Strong evidenceWell past the age this condition usually starts. Strong evidence against the allele in that branch.
Uncle, 22, no symptoms
Almost noneFar too young to have shown it yet. Tells you almost nothing either way.
The same is true of you. For a condition that usually starts at 40, being 25 and well says much less than being 55 and well — and your number moves accordingly.
Start from the question you actually have
Inheritance patterns, family risk, and prenatal tests — written for families who need a clear answer, not a textbook chapter.
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Is Type 2 Diabetes Hereditary? Your Risk If a Parent Has It
About 1 in 3 adults get type 2 diabetes. With one affected parent it is roughly 40–50%, with both about 2 in 3. What moves your own number, and what lowers it.
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Is Alzheimer's Hereditary? Your Risk If a Parent Had It
A parent or sibling with Alzheimer's roughly doubles your risk, yet most people never develop it. When the age it started points to a 50% gene instead.
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Is Cancer Hereditary? When a Family History Points to a Gene
Only 5–10% of cancers are inherited, but a close relative with breast, bowel or prostate cancer roughly doubles your risk. The signs it is a gene, and what to do.
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Is Schizophrenia Hereditary? Your Risk If a Parent or Sibling Has It
About 1 in 100 people develop schizophrenia; with one affected parent, about 1 in 10; with both, roughly 1 in 3. Why age matters, and what it means for children.
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Can a Genetic Disease Skip a Generation? Which Ones Do and Why
Some do. X-linked conditions pass through healthy daughters, recessive ones through carriers, and some dominant genes spare a carrier. Which fits your family?
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High-Risk NIPT Result: What Happens Next?
A high-risk NIPT is a screening result, not a diagnosis. How likely it is to be confirmed, what the ultrasound can and cannot tell you, and what the next tests are.
Read it
Common questions
- Can I get an estimate without a genetic test?
- Yes. The model infers carrier and onset probabilities from pedigree structure, who is affected, ages at onset and the ages of unaffected relatives. A laboratory result is not required; if you already have one, it can be entered as additional evidence.
- How long does it take?
- Most people finish a usable family tree and see a result in about fifteen minutes. Incomplete information is allowed — the estimate treats missing facts as unknown rather than filling them in.
- Is this a diagnosis?
- No. The output is a probability estimate for education and personal understanding. It does not replace a consultation, a laboratory test, or a clinician’s judgement. Decisions about testing, treatment or pregnancy should be made with a qualified professional.
- What is free, and what does a report add?
- Building the tree and seeing which conditions fit the family — named, ranked, with the inheritance pattern — is free and needs no account. Per-relative carrier and age-adjusted onset probabilities, and the exportable PDF, are part of a one-off $20 report.
In fifteen minutes, you will have a number
No kit to order, no sample to post. If you know who is affected, you can start now.
Check what you inherit — freeFree to start · no account needed