Pregnancy & Fertility
hCG Levels Calculator
hCG doubles every 48–72 hours in early pregnancy. See where a level sits against typical ranges for gestational age.
hCG (human chorionic gonadotropin) doubles roughly every 48–72 hours in early pregnancy. Typical levels are about 5–50 mIU/mL at 3 weeks, 5–426 at 4 weeks, and 18–7,340 at 5 weeks after the last period. Dates are estimates — confirm timing with your provider and ultrasound where relevant.
Doubling time: 48–72 hours early on.
Below 5 mIU/mL = not pregnant.
Single values matter less than trends.
Calculate Your hCG Levels
Typical hCG
What Is hCG Levels?
hCG is the hormone produced after implantation; home pregnancy tests detect it in urine. Levels rise steeply in early pregnancy, doubling every 48–72 hours until about week 10.
Because individual variation is huge, clinicians watch the trend and confirm with ultrasound — a single number rarely tells the story.
How It Is Calculated
Early pregnancy: hCG doubles ≈ every 48–72 hours until ~week 10
Example: Example: 4 weeks since LMP → typical range 5–426 mIU/mL (midpoint ≈ 215)
Typical hCG by weeks since LMP
| Weeks since LMP | Typical range (mIU/mL) |
|---|---|
| 3 | 5–50 |
| 4 | 5–426 |
| 5 | 18–7,340 |
| 6 | 1,080–56,500 |
Limitations
- Ranges overlap massively — dating is approximate.
- Slow rises can still be normal; falling levels need evaluation.
- Ectopic and molar pregnancies distort hCG patterns.
- Always interpret with a clinician.
Sources & Review
References used for this calculator’s formulas and thresholds:
hCG Levels FAQ
What is a good hCG level at 4 weeks?
Anything from 5 to 426 mIU/mL falls in the typical range — what matters is the rate of rise over 48–72 hours.
Does hCG doubling always mean healthy pregnancy?
Not always — ectopic pregnancies can also rise early. Ultrasound is needed to confirm placement.
What level confirms pregnancy?
Above 25 mIU/mL generally confirms; 5–25 is borderline and usually retested in 48 hours.
When do hCG levels peak?
Around week 10, then they decline and plateau for the rest of pregnancy.
Important disclaimer: Results are educational estimates, not a substitute for professional medical advice. Discuss your results with a qualified professional before making decisions.