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Enter beta-hCG (mIU/mL) to estimate how many weeks pregnant you are on a last menstrual period (LMP) teaching scale, see typical hCG levels by week, and read doubling-time guidance. Works for common searches like hCG 1500 or hCG 6000 how many weeks. Educational— ultrasound dates pregnancy; serial hCG assesses rise. More on our medical calculators hub.
Last updated: June 4, 2026
Quantitative blood test result
Estimated gestational age (LMP)
5–6 weeks LMP
Teaching band from beta-hCG 1,500 mIU/mL
From conception
3–4 weeks from conception
Trimester
First trimester
Typical range for this band
500–6,000 mIU/mL
Expected doubling time (teaching)
72–96 hours
Interpretation
Includes common values like 1,500 mIU/mL. Intrauterine gestational sac often seen on transvaginal ultrasound around 5 weeks LMP.
Not for diagnosis. Ultrasound and serial beta-hCG with your clinician when symptoms or fertility treatment warrant.
5–6 weeks LMP
72–96 hours
4–5 weeks LMP
6–7 weeks LMP
7–10 weeks LMP
Doubling example: 800 → 1,680 mIU/mL in 48 h ≈ 45 hour doubling time (teaching).
| Weeks LMP | From conception | hCG (mIU/mL) | Doubling (teaching) | Milestone |
|---|---|---|---|---|
| 3–4 | 1–2 wks | 5–50 | 48–72 h | Often just detectable; repeat in 48–72 h |
| 4–5 | 2–3 wks | 50–500 | 48–72 h | Early intrauterine pregnancy possible on US |
| 5–6 | 3–4 wks | 500–6,000 | 72–96 h | Gestational sac often visible ~5 wks LMP |
| 6–7 | 4–5 wks | 6,000–20,000 | 96+ h | Yolk sac / heartbeat era on TV US |
| 7–10 | 5–8 wks | 20,000–100,000 | Slowing | Rapid rise toward first-trimester peak |
| 10–12 | 8–10 wks | 100,000–200,000+ | Plateau | Peak then decline begins |
| Beta-hCG level | Expected pattern |
|---|---|
| < 1,200 mIU/mL | Double every 48–72 hours (minimum ~53% rise in 48 h) |
| 1,200 – 6,000 mIU/mL | Double every 72–96 hours |
| > 6,000 mIU/mL | Doubling slows; plateau near 10–12 weeks LMP |
Doubling time (hours) ≈ (hours between tests × 0.693) ÷ ln(second ÷ first)
Minimum viable rise often cited: ≥53% in 48 hours when still early.
| Pattern | Rule of thumb | Clinical meaning (summary) |
|---|---|---|
| Appropriate rise | ≥53% increase in 48 h (often doubles in 48–72 h when <1,200 mIU/mL) | Compatible with intrauterine viable pregnancy in many cohorts—still needs clinical correlation |
| Slow rise | <53% in 48 h or plateau | Ectopic pregnancy, miscarriage, or wrong dates until ultrasound clarifies |
| Falling | Decline between serial draws | Completed or impending loss, or resolving ectopic—urgent obstetric review |
| Very high for dates | Markedly above median for assumed week | Consider multiples, molar pregnancy, or overstated gestational age—ultrasound key |
Useful when ultrasound is not yet due and you need a rough “how many weeks” context. Pair with serial rise and symptoms review.
Confirms intrauterine pregnancy and beats hCG for precise dating. If LMP is reliable, also try our gestational age calculator.
Ectopic pregnancy emergency: severe abdominal pain, shoulder pain, dizziness, or heavy bleeding with positive pregnancy tests need immediate obstetric or emergency care—not this calculator.
For early pregnancy, fertility communities, and nursing education
Suggested hashtags: #Pregnancy #BetaHCG #TTC #Obstetrics #Calculator