Egg Freezing Calculator
Estimate the probability of live births from frozen eggs based on your age and the number of oocytes frozen. Based on research by Goldman et al.
How to Use the Egg Freezing Calculator
It's extremely easy! Just two simple steps:
- Enter your age. Age plays a crucial role in fertility — the number of available eggs diminishes every month, and their quality is also significantly affected.
- Enter the number of frozen oocytes. Choose how many eggs you'd like to freeze.
Our tool will show you the expected probabilities of giving birth to one, two, or three children. Adjust the number of eggs to find a probability that best suits your needs.
How to Calculate Egg Freezing Success Rate
The calculator uses the following formula (from Goldman et al. research):
Where:
- PE — Probability of a euploid blastocyst (normal chromosomes). Decreases with age as genetic material deteriorates.
- PB — Probability of an oocyte maturing into a blastocyst (initial embryo stage).
- n — Number of frozen mature eggs.
Why Do We Freeze Eggs?
Egg freezing is used to preserve fertility for several reasons:
- Postpone becoming parents while maintaining the ability to have biological children
- Preserve fertility before medical treatments (e.g., chemotherapy) that may damage eggs
- Address male infertility issues by banking healthy eggs in advance
- Secure fertility in cases of unexpected illness
When Is the Best Time to Freeze Eggs?
The best time to freeze eggs is between 24 and 35 years old — this is when fertility is relatively stable and at its peak. After 35, both egg quantity and quality decline more rapidly.
A fascinating fact: every woman is born with a complete set of unfertilized eggs (oocytes). The eggs are present since the first moments of existence, meaning they are exactly as old as the woman herself.
Example: How Many Eggs Should I Freeze at Age 36?
Here's a reference table for a 36-year-old woman:
| No. of Eggs | ≥ 1 Live Birth | ≥ 2 Live Births | ≥ 3 Live Births |
|---|---|---|---|
| 1 | 8.7% | <1% | <1% |
| 5 | 36.5% | 6.3% | 0.6% |
| 8 | 51.6% | 14.8% | 2.6% |
| 10 | 59.6% | 21.3% | 4.9% |
| 14 | 71.9% | 34.6% | 11.5% |
| 20 | 83.7% | 52.8% | 24.8% |
| 30 | 93.4% | 74.7% | 48.9% |
| 40 | 97.3% | 87.3% | 68.6% |
Frequently Asked Questions
How many eggs should I freeze?
This depends on your age and your desired number of children. At age 34 or younger, freezing 10-15 eggs gives a good chance (>70%) for at least one child. At 38+, you may need 20-30 eggs for similar probabilities. Use the calculator above to find your optimal number.
Does egg freezing guarantee a pregnancy?
No. Egg freezing increases the possibility of a future pregnancy, but no method guarantees 100% success. Success rates depend on age at freezing, egg quality, the IVF/ICSI process, and individual health factors.
What is a euploid blastocyst?
A euploid blastocyst is an embryo (at the blastocyst stage, day 5-6) that has the normal number of chromosomes (46). As women age, the proportion of euploid embryos decreases, leading to lower success rates with older eggs.
How long can frozen eggs be stored?
Frozen eggs can be stored indefinitely using vitrification (ultra-rapid freezing). There is no evidence that storage duration affects egg quality. Eggs frozen for over 10 years have been successfully used to achieve pregnancies.