Rehydration Calculator
Enter the weight of your freeze-dried breast milk powder and we'll work out how much water to add to reconstitute it to 87% water / 13% solids.
Tip: 1 mL of water ≈ 1 g, so millilitres and grams are interchangeable here.
Add this much water
Quick reference table
| Powder (g) | Water to add (mL) | Total (mL) |
|---|
How the maths works
Breast milk is naturally about 87% water and 13% solids. Freeze-drying removes the water, leaving a powder of roughly 100% solids. To return the powder to fresh-milk consistency, we add enough water so the final mixture is 87% water by weight.
water (mL) = powder (g) × 0.87 / 0.13
≈ powder × 6.6923
So 10 g of powder needs about 66.9 mL of water, for a total of about 76.9 mL of reconstituted breast milk.
