Home / Calculators / IVF success and prediction / Euploid embryo probability
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These tools provide general information and are not a diagnosis or a substitute for assessment by a qualified clinician. Reference ranges and sources are stated on each calculator. Predictive estimates describe groups of people and cannot predict an individual outcome.
A calculator sees three or four figures. A specialist sees your history, your scans, your partner's results, and how you actually responded to treatment. If you're between cycles, changing clinics, or something in your results doesn't add up, a second opinion is the fastest way to find out whether anything would be done differently.
Free first consultation. No obligation to start treatment, and it doesn't affect your care at your current clinic.
Expected proportion of chromosomally normal embryos by age.
Population estimateAn average for people with your inputs, not a prediction for you. Individual outcomes vary widely around it.
Published euploidy rates fall steeply with the age of the egg. ASRM's 2024 committee opinion reports 52% of blastocysts aneuploid under 35 and 64.5% aneuploid at 35–40 — so roughly 48% and 36% euploid. Rates vary by testing platform and laboratory.
Source — ASRM Committee Opinion on PGT-A (2024): 52.0% of blastocysts aneuploid in women <35, 64.5% at 35–40. Age-banded euploidy for good-quality blastocysts (Hum Reprod 2023): 73% under 35, 54% at 35–36, 37% at 37–38, 31% at 39–40, 23% at 41–42, 5% at 43–44. Ranges are wide — reported standard deviations approach 30% within age bands.
The age of the eggs, not the recipient
To estimate how many may be euploid
That falls in the 30–50% band.
Your result of 38 % sits in the highlighted band. Bands are reference points used alongside clinical findings — not a diagnosis.
Around the middle of the range. Two to three blastocysts would typically be expected to yield one euploid.
ASRM Committee Opinion on PGT-A (2024): 52.0% of blastocysts aneuploid in women <35, 64.5% at 35–40. Age-banded euploidy for good-quality blastocysts (Hum Reprod 2023): 73% under 35, 54% at 35–36, 37% at 37–38, 31% at 39–40, 23% at 41–42, 5% at 43–44. Ranges are wide — reported standard deviations approach 30% within age bands.
These tools apply across the process rather than at one point in it.
Because it genuinely is. Reported standard deviations within an age band approach 30 percentage points, so most people under 35 sit somewhere between a 30% and 90% chance per blastocyst. An average is a poor guide to an individual.
The age of the egg. With donor eggs, euploidy tracks the donor's age rather than yours, which is why donor programmes change the picture so sharply after 40.
Substantially. One published series found 73% euploidy in good-quality blastocysts under 35 versus 58% in medium-quality ones at the same age. Grade is not destiny, but it shifts the odds.
A calculator sees three or four figures. A specialist sees your history, your scans, your partner's results, and how you actually responded to treatment. If you're between cycles, changing clinics, or something in your results doesn't add up, a second opinion is the fastest way to find out whether anything would be done differently.
Free first consultation. No obligation to start treatment, and it doesn't affect your care at your current clinic.
Published population rates, not a prediction about your embryos. Rates differ by testing platform, laboratory, and blastocyst quality — good-quality blastocysts test euploid considerably more often than poor-quality ones at the same age. Nothing here is a diagnosis or a substitute for assessment by a clinician.
A calculator gives you a number. These explain what it means, and what it does not.
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