Pregnancy Due Date & Week Calculator
Estimate your due date, pregnancy week and trimester from the date or report you have.
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hCG Change & Doubling Time Calculator
In early pregnancy, how fast beta-hCG rises matters more than any single number. Enter two blood results with their dates and times to see the doubling time and the percentage rise.
How to use it
- Enter the earlier result first, with the date and time the sample was taken.
- Enter the later result second. The two tests should be at least 48 hours apart to be meaningful — closer together and normal variation swamps the trend.
- Read the doubling time together with the "typical at this level" line, because expected doubling slows as hCG climbs.
How to read the number
- Below about 1,200 mIU/mL, hCG typically doubles every 48 to 72 hours. Between 1,200 and 6,000 it takes about 72 to 96 hours. Above 6,000 it slows further, often to 96 hours or more.
- A rise of at least 53% over 48 hours is the usual threshold quoted for a potentially viable intrauterine pregnancy — but a substantial minority of perfectly healthy pregnancies rise more slowly.
- A single value tells you very little. hCG levels at the same gestational age vary enormously between healthy pregnancies.
- This calculator cannot tell you whether a pregnancy is viable, ectopic or miscarrying. Only your doctor, using your results together with an ultrasound and your symptoms, can do that.
Frequently asked questions
What is a normal hCG doubling time?
In the first weeks, roughly 48 to 72 hours while levels are below about 1,200 mIU/mL. It naturally slows as the number rises, and after around 10 weeks of pregnancy hCG plateaus and then falls — which is entirely normal.
My hCG is rising slowly. Does that mean miscarriage?
Not necessarily. Slow rise raises concern about an ectopic or a non-viable pregnancy, but healthy pregnancies with slow early rises do occur. What settles the question is an ultrasound once the level is high enough to see a sac, usually around 1,500–2,000 mIU/mL, together with your symptoms.
Does a high hCG mean twins?
Higher levels are more common with twins, but the overlap with singleton pregnancies is so wide that hCG cannot diagnose a twin pregnancy. Only a scan can.
How soon after IVF is hCG tested?
Usually about 9 to 14 days after transfer, depending on the embryo day and your centre’s protocol. Testing earlier risks picking up residual hCG from a trigger injection and getting a misleading result.
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