Home / Calculators / Embryology / Eggs needed for one euploid
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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.
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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.
How many eggs it typically takes to reach one chromosomally normal embryo.
Population estimateAn average for people with your inputs, not a prediction for you. Individual outcomes vary widely around it.
Reaching one euploid embryo means passing four published steps: about 85% of retrieved eggs are mature, roughly 70% of those fertilise, a minority reach blastocyst, and a minority of those test euploid. Because the rates multiply, the number of eggs needed rises sharply with age.
Source — Step rates from published averages: maturity ~85%, fertilisation ~70% (ICSI), blastocyst conversion declining with age, euploidy per ASRM 2024 and Hum Reprod 2023 age bands. Individual laboratory rates vary considerably — use your own unit's figures where you have them.
Age of the eggs
Often one per intended child
That falls in the <12 band.
Your result of 10 eggs sits in the highlighted band. Bands are reference points used alongside clinical findings — not a diagnosis.
Typically achievable in one retrieval cycle for most people with adequate reserve.
Step rates from published averages: maturity ~85%, fertilisation ~70% (ICSI), blastocyst conversion declining with age, euploidy per ASRM 2024 and Hum Reprod 2023 age bands. Individual laboratory rates vary considerably — use your own unit's figures where you have them.
Highlighted is the stage this measurement belongs to. It is a map of the process, not a schedule — timings vary by protocol and by clinic.
Because attrition compounds. Four rates each below one, multiplied together, drop fast. This is the single most common surprise in fertility planning and the main argument for banking across cycles.
No. Most people bank across two or three retrievals. The calculator exists to make the case for planning a course rather than judging a single cycle.
Blastocyst conversion and euploidy, both of which track egg age. Maturity and fertilisation are more consistent, which is why they are shown as fixed assumptions here.
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.
Built from published average step rates. Your own unit's figures are the right inputs if you have them, because laboratory performance varies meaningfully. 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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