Beta hCG Levels Week by Week: The Full Chart

You got a beta hCG result, and now you want to know whether it is normal for how far along you are. That is exactly what this page is for. Below is the full by-week chart through to term, plus a short guide to reading it without driving yourself to worry. For what your number means in context, and when to be concerned, our companion article on hCG levels and when to worry goes deeper.

The beta hCG chart by week

These are the widely used reference ranges, measured in milli-international units per milliliter and counted from the first day of your last period, not from conception.

Weeks since last period	hCG range (mIU/mL)
3 weeks	5 to 50
4 weeks	5 to 426
5 weeks	18 to 7,340
6 weeks	1,080 to 56,500
7 to 8 weeks	7,650 to 229,000
9 to 12 weeks	25,700 to 288,000
13 to 16 weeks	13,300 to 254,000
17 to 24 weeks	4,060 to 165,400
25 to 40 weeks	3,640 to 117,000

This chart comes from the American Pregnancy Association, the same dataset most reference pages use.

How to read the chart

Find your week, look at the range, and notice how enormous it is. At 5 weeks, normal runs from 18 all the way to over 7,000. That width is the point: a person at 5 weeks with a level of 90 and another at 5 weeks with a level of 4,200 are both squarely in the normal range. Your single number landing somewhere inside that band tells you very little on its own. It is context, not a score you pass or fail.

This is also why a number that looks far from a friend's, or from a value you saw online, is usually nothing to worry about. Two healthy pregnancies at the identical stage routinely produce wildly different betas.

Why the weeks count from your last period

The single biggest reason a number seems wrong is a dating mismatch. These weeks are counted from your last menstrual period, which is roughly two weeks before you actually conceived. So if you think of yourself as "5 weeks since conception," you are really closer to 7 weeks by this chart, a completely different row. If you ovulated later than the textbook day 14, your true week may be earlier than your dates suggest, which can make a perfectly healthy level look low.

The rise, the peak, and the decline

hCG climbs steeply through early pregnancy, then changes direction. It peaks somewhere around 8 to 11 weeks, often in the range of 100,000 to 200,000, and then falls and levels off for the rest of the pregnancy. You can see this in the chart itself: the 13-to-16 week and later rows sit lower than the 9-to-12 week peak. If your number drops after the peak, that is the normal curve, not a warning sign. Many people miss this because most charts stop at 12 weeks.

What the chart cannot tell you about twins

Twin pregnancies do tend to run higher, often around 30 to 50 percent above a singleton at the same stage, and they sometimes rise a little faster early on. But the ranges overlap so heavily that a high number cannot diagnose twins. On any given day, a meaningful share of singleton pregnancies sit in what looks like the twin range. Only an ultrasound can confirm more than one baby.

How providers actually use beta numbers

In the clinic, a single beta matters far less than the trend. When there is a reason to monitor, providers draw two betas a couple of days apart and look at how much the level rose, because the pattern over time is far more informative than any one value on the chart. A single number cannot confirm that a pregnancy is viable, which is why your care team interprets your betas alongside your dates, your symptoms, and eventually an ultrasound rather than reading a chart row in isolation.