Egg Freezing Calculator

What Is the Egg Freezing Calculator?

Elective oocyte cryopreservation lets you store mature eggs for future family building. This calculator estimates the probability of one, two, or three live births based on your age at retrieval and how many mature eggs you freeze. It uses the Goldman et al. model published in Human Reproduction, the same evidence base referenced by major fertility counseling tools. Pair it with the Fertility Calculator or Clomid Ovulation Calculator for broader cycle planning.

How the Model Works

The tool combines three age-sensitive factors: blastocyst formation from each mature egg, euploid (chromosomally normal) blastocyst rate, and an assumed 60% live birth rate per transferred euploid embryo. Thaw survival is modeled at 95% under age 36 and 85% at age 36 or older.

Formula

Probability of at least one live birth:

$$P_{\geq 1} = 1 - \left(1 - 0.6 \cdot P_E \cdot P_B\right)^n$$

Where $P_E$ is the euploid blastocyst probability by age, $P_B$ is the blastocyst formation probability per mature egg, and $n$ is the number of frozen mature oocytes. Probabilities for two or three live births use a Poisson model with expected value $n \cdot 0.6 \cdot P_E \cdot P_B$.

When to Freeze Eggs

Clinicians often recommend considering egg freezing between ages 24 and 35, when ovarian reserve and egg quality are typically strongest. No number of frozen eggs guarantees a live birth, but more eggs generally raise cumulative success for future transfers.