Calculator
hCG Doubling Time
Two beta numbers in. We tell you the doubling time and whether it tracks early pregnancy.
Doubling time
48.0 hours
Healthy doubling range for early pregnancy is 24–72 hours. You are within it.
Percent rise: 100.0% ·
Healthy range is 24–72 hours doubling time at <6,000 mIU/mL.
How is this calculated?
Doubling time uses the formula t = (hours × ln 2) / ln(b/a) where a and b are your two beta values. A healthy early pregnancy doubles every 24–72 hours when beta is below ~6,000 mIU/mL. Above that, doubling slows — that's normal.
Not medical advice. Always confirm important results with your clinic.