Breastmilk Storage Calculator
Find safe storage times for breastmilk at room temperature, in the refrigerator, and in the freezer based on CDC guidelines.
Results
Visualization
How It Works
CDC guidelines for breastmilk storage: room temp up to 4 hours, fridge up to 4 days, freezer up to 6-12 months. Always label bags with the date. Not medical advice -- when in doubt, throw it out.
The Formula
Room temp (77F): up to 4 hours
Insulated cooler: up to 24 hours
Refrigerator (40F): up to 4 days
Freezer (0F): 6-12 months
Deep freezer (-4F): 6-12 months
Insulated cooler: up to 24 hours
Refrigerator (40F): up to 4 days
Freezer (0F): 6-12 months
Deep freezer (-4F): 6-12 months
Variables
- CDC guidelines — Centers for Disease Control storage recommendations
- 25 oz/day — Average daily breastmilk intake for babies 1-6 months
Example
4 oz bag in the fridge for 2 hours = safe, 94 hours remaining before the 4-day limit.
Tips
- Store milk in the back of the fridge, not the door (more consistent temperature)
- Label every bag or bottle with the date expressed
- Never refreeze thawed breastmilk
- Thawed milk should be used within 24 hours
- It is normal for stored breastmilk to separate -- gently swirl to mix