Beta hCG doubling calculator

How quickly are hCG levels rising

Use this calculator to calculate the doubling time of two beta hCG samples (quantitative hCG blood test) by entering the values of the blood tests and the date and time of each test.

Date & time of first beta


Date & time of second beta




hCG Information

In many early pregnancies, the hCG level will double every 31 to 72 hours. As the pregnancy progresses, hCG levels rise and the doubling time increases.

"Normal" Doubling Time
hCG levels Doubling Time
Under 1200 mIU/ml 31-72 hours
Between 1200 to 6000 mIU/ml 72-96 hours
Over 6000 mIU/ml more than 96 hours

hCG levels rise during the first 6 to 10 weeks of pregnancy then decline slowly during the second and third trimesters.

Human Chorionic Gonadotropin (hCG) Levels
From Conception hCG Level
0-1 Weeks 0 - 50 mIU/ml
1-2 Weeks 40 - 300 mIU/ml
3-4 Weeks 500 - 6,000 mIU/ml
1-2 Months 5,000 - 200,000 mIU/ml
2-3 Months 10,000 - 100,000 mIU/ml
2nd Trimester 3,000 - 50,000 mIU/ml
3rd Trimester 1,000 - 50,000 mIU/ml
Non-Pregnant Women < 5.0 mIU/ml
Postmenopausal Women < 9.5 mIU/ml

Important! Please keep in mind there is a huge variation in "normal" hCG levels at any given time in a pregnancy. These numbers and times are provided only as a guideline. If you have any concerns please consult with your healthcare provider.




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