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Euploid embryo probability calculator

How many of my embryos may be normal?

Q: Why is the range so wide?

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.

Q: Whose age matters — mine or the donor's?

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.

Q: Does blastocyst quality affect this?

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.

The expected proportion of chromosomally normal embryos at the age the eggs came from, and what that implies for how many blastocysts you need.

Age at egg retrieval

years

The age of the eggs, not the recipient

Blastocysts available

To estimate how many may be euploid

These are example numbers. Replace them with yours, then press Calculate.

Example answer

38%

30–50%

Around the middle of the range. Two to three blastocysts would typically be expected to yield one euploid.

This is a guide, not a diagnosis. Share the result with your doctor.

Your result on the scale

The ranges this calculator uses. Yours is highlighted.

Your numbers

Everything worked out from what you entered.

Blastocysts available: 4
Estimated euploid rate: 38%
Expected euploid embryos: 1.5
Chance at least one is euploid: 85%

What each result means

Your result is highlighted. Your own clinic's advice always comes first.

Your result<15%

A low expected euploid rate. More blastocysts are typically needed to reach one normal embryo, which is the main argument for banking across cycles at this age.

Your result15–30%

Reduced. Roughly three to six blastocysts would typically be needed to expect one euploid embryo.

Your result30–50%

Around the middle of the range. Two to three blastocysts would typically be expected to yield one euploid.

Your result50%+

A high expected rate. Most blastocysts at this age are chromosomally normal.

Where this fits in your journey

The usual order, from trying to conceive to pregnancy. Not everyone needs every stage. This calculator belongs to stage 3.

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This calculator: How many of my embryos may be normal?

Calculators for what comes next

How this is worked out

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.

About this calculator

?What it tells you

Chromosomally normal embryos by age. The expected proportion of chromosomally normal embryos at the age the eggs came from, and what that implies for how many blastocysts you need.

✓When to use it

Before deciding whether PGT-A is worth it for you

iWhat you need

Age at egg retrieval (years)
Blastocysts available

!What it cannot tell you

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.

Common questions

Why is the range so wide?

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.

Whose age matters — mine or the donor's?

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.

Does blastocyst quality affect this?

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.

Sources

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.

ASRM Practice Committee documents

In an emergency

If you have any of the warning signs listed here, don't wait for a test result or a calculator. Get help now.

112All emergencies, anywhere in India 108Ambulance

Also call your IVF clinic. Most clinics give an emergency number on your treatment or discharge sheet. Save it in your phone now, before you need it.