Egg Freezing Calculator

How to use the egg freezing calculator

What this calculator does

This calculator estimates the probability that a bank of frozen mature oocytes could ultimately lead to at least one, at least two, or at least three live births. It uses the age at which the eggs were retrieved and the number of mature eggs frozen. The calculation follows the counseling model developed by Goldman and colleagues, which combines age-related blastocyst development, age-related euploidy, assumed post-thaw survival, and a live-birth probability per transferred euploid blastocyst. It is a planning estimate rather than a diagnosis, a prediction of natural fertility, or a guarantee of pregnancy.

When to use it

It can be useful when discussing elective egg freezing before a cycle, reviewing how a completed retrieval changes estimated family-building possibilities, comparing the effect of banking more mature eggs, or preparing questions for a fertility specialist. Professional counseling remains important because clinic performance, medical history, sperm factors, embryo development, transfer practices, and future health are not represented by these two inputs. The ASRM guideline on outcomes after oocyte cryopreservation emphasizes both age effects and the limits of evidence for specifying an absolute number of eggs that guarantees a live birth.

How to calculate

1. The calculator opens with a complete demonstration: age 36 and 14 frozen mature eggs. The example results are already calculated, and the Excel workbook is immediately available.
2. Replace Age with your age in whole years at the time the eggs were retrieved or frozen. Replace Number of frozen mature eggs with the mature-oocyte count you want to evaluate. Results update live.
3. Read Probability of at least 1 live birth first for the broadest family-building threshold, then review the at-least-two and at-least-three probabilities if multiple future births are relevant to your planning.
4. Use Download Excel to save the current inputs, all three probabilities, and model notes in a real XLSX workbook. Reset clears the demonstration and all calculated content; Excel export stays unavailable until both required fields are valid again.

Input guide

Age is required and accepts whole years from 24 through 44. A valid example is 36. For ages 24 – 35, this implementation follows the model's grouped “35 or younger” category; from 36 through 44, it uses the published age-specific euploid proportions. Entering a decimal, text, a negative value, or an age outside the supported range is rejected rather than silently rounded. In general, higher age within the modeled range lowers the estimated probabilities because both blastocyst development and chromosomal normality are age-related in the underlying model.

Number of frozen mature eggs is required and accepts a whole count from 1 through 100; 14 is the demonstration value. This is the number of mature eggs available for future use, not the number of follicles seen on ultrasound, total eggs retrieved before maturity assessment, embryos, or blastocysts. More mature eggs generally increase each cumulative probability, but the model shows diminishing returns as the estimate approaches its upper bound.

Output guide

Probability of at least 1 live birth is the estimated chance of one or more live births from the modeled egg bank. Probability of at least 2 live births is the chance of two or more, and Probability of at least 3 live births is the chance of three or more. All three are percentages driven by the same age and mature-egg count. They are nested probabilities, not mutually exclusive categories, so they must not be summed. A low percentage does not mean pregnancy is impossible, and a high percentage does not guarantee a live birth. Each value is an estimate based on population-level assumptions rather than an individualized clinical forecast.

Worked example

With the startup values of age 36 and 14 frozen mature eggs, the published model inputs imply an estimated per-oocyte live-birth probability of about 8.67%. Applying the binomial cumulative calculation across 14 mature eggs gives 71.92% for at least one live birth, 34.59% for at least two, and 11.54% for at least three. Those exact values appear on first open, in the probability table, and in the downloadable workbook.