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Egg Freezing Outcome Calculator

Estimate your chance of having a baby from frozen eggs based on age and number of eggs frozen

yrs
eggs

Estimated separately from three independent clinical datasets

How does this calculator work?

  1. 1 Select your age at the time of freezing (20–45)
  2. 2 Select the number of eggs frozen (1–40)
  3. 3 See the estimated odds of at least one live birth and of two or more

What Are Egg Freezing Success Rates?

Egg-freezing success = 1 − (1 − p)^n, where p is the per-egg live-birth probability (estimated by age) and n is the number of eggs frozen. This is a binomial model built on published clinical data.

Freezing before 35 yields the best results, with roughly 8–16% live-birth probability per egg. That drops to 4–8% at 35–40 and just 1–4% over 40, making age the single most important factor.

Data comes from Spring Fertility (13,533 eggs), Doyle et al. (1,283 eggs), and Cobo et al. (1,513 eggs). Individual results also depend on egg quality, vitrification technique, and lab conditions.

Frozen eggs can in principle be stored indefinitely, though use within 5 years is commonly advised. Modern vitrification has dramatically improved egg survival rates.

How Are Egg Freezing Success Rates Estimated?

A binomial model where p is the live-birth probability per egg (estimated from clinical data by age) and n is the number of eggs frozen. Data sources: Spring Fertility (13,533 eggs), Doyle et al. (1,283 eggs), Cobo et al. (1,513 eggs).

Probability = 1 − (1 − p)^n

What Should I Know Before Freezing My Eggs?

  • • Freezing before 35 gives the best results — aim for at least 15–20 eggs
  • • At 35–40 you need more eggs to reach comparable success rates
  • • Over 40, consult a fertility specialist — multiple retrieval cycles may be needed
This calculator is for reference only and does not replace professional medical advice. Please consult your doctor for personalized guidance.

Frequently Asked Questions

Are these probabilities accurate?
They are estimates from large clinical datasets, for guidance only. Real outcomes also depend on egg quality and laboratory technique.
How long can frozen eggs be stored?
Indefinitely in theory, but using them within 5 years is generally advised.
What is the best age to freeze eggs?
Under 35, when egg quality is highest. Quality declines after 35, and over 40 substantially more eggs are needed.
How many eggs should I freeze?
Under 35, aim for 15–20; at 35–40, 20–25; over 40, 25 or more, or talk through options with a specialist.

References

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