Home / Calculators / Egg and embryo freezing / Egg freezing timing
Every calculator in one place, free and with no sign-up. Results show instantly — we don't hide them behind a form. Each one explains what the number means, where the reference ranges come from, and what it cannot tell you.
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.
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.
The trade between egg quality now and the chance you ever use them.
Population estimateAn average for people with your inputs, not a prediction for you. Individual outcomes vary widely around it.
Most people who freeze eggs never use them. Published usage rates range from about 8% to 16% of women returning to thaw, and one cohort found return rates of 10.6%, 26.6% and 12.7% for women who froze at 35 or under, 36–39, and 40 or over respectively.
Source — Usage rate 8.4% (54/645) over a cohort followed to 2020; 16% in a separate cohort with mean freeze age 37.1. Return-to-thaw by age at freezing: 10.6% (≤35), 26.6% (36–39), 12.7% (≥40). Live birth by age at freezing from Hirsch et al. 2024.
That falls in the 15–35% band.
Your result of 21 % chance of use sits in the highlighted band. Bands are reference points used alongside clinical findings — not a diagnosis.
A middle position. Eggs are still good and the chance of using them is meaningful.
Usage rate 8.4% (54/645) over a cohort followed to 2020; 16% in a separate cohort with mean freeze age 37.1. Return-to-thaw by age at freezing: 10.6% (≤35), 26.6% (36–39), 12.7% (≥40). Live birth by age at freezing from Hirsch et al. 2024.
These tools apply across the process rather than at one point in it.
Proportions of the figures you entered above. Percentages are of the total shown, and are arithmetic on your own numbers — not a benchmark.
There isn't one, and any tool naming a single age is not being straight with you. Egg quality falls with age while the probability you actually use them rises. Published usage rates peak in the 36–39 band.
Most people who freeze do not use their eggs, usually because they conceived without needing to. That is not a failure — but it should be a decision made knowingly rather than discovered later.
Because they had more time to conceive naturally. The 36–39 band returns most often, which is consistent with freezing closer to the point of need.
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.
There is deliberately no recommended age here. The two curves run in opposite directions and where you sit between them is a personal judgement, not a clinical one. 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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