Egg Freezing Calculator
Estimate the number of eggs needed to freeze and the likelihood of a live birth based on age and egg count using published success rate data.
Formula
P(≥1 live birth) = 1 − (1 − rate per egg)^n eggs
- Live birth rate per frozen egg: <30 yrs ~6.5%; 30-34 ~5.5%; 35-37 ~4%; 38-39 ~2.5%; 40-42 ~1.5%.
- These are estimates based on published SART/ASRM data — actual results vary by clinic and individual.
- Many specialists recommend 10-20 eggs for women under 38 for a good chance of 1 live birth.
Age 33, 15 eggs frozen, 1 child desired
Inputs
- Current Age: 33
- Number of Eggs to Freeze: 15
- Desired Children: 1
At 5.5% per egg, 15 eggs: P(≥1 LB) = 1-(0.945)^15 ≈ 57%. To achieve 90% probability at 5.5%: ~40 eggs needed.
Frequently asked questions
How many eggs should I freeze?
Most fertility specialists recommend 10-20 mature eggs for women under 38 to achieve a reasonable chance of one live birth.
Does egg quality decline with age?
Yes — both egg quantity and quality (chromosome normality) decrease significantly after age 35.
Is egg freezing the same as embryo freezing?
Egg freezing (oocyte cryopreservation) freezes unfertilized eggs; embryo freezing requires fertilization first. Both are used for fertility preservation.
Is this calculator medically accurate?
These are statistical estimates based on population data. Individual results vary. Consult a reproductive endocrinologist for personal assessment.