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hCG Doubling Time Calculator
Track your hCG levels and doubling time to monitor early pregnancy progression.
Enter Your hCG Results
First hCG Test
Second hCG Test
What Is hCG?
hCG (Human Chorionic Gonadotropin) is a hormone produced during pregnancy:
- Produced by the placenta after implantation.
- This is the hormone detected by pregnancy tests.
- Levels rise rapidly in early pregnancy, then plateau around weeks 8-11.
Understanding Doubling Time
hCG doubling time is a key indicator of early pregnancy health:
- Normal doubling time is 48-72 hours in early pregnancy.
- Slower doubling may warrant further investigation.
- A single hCG value matters less than the trend over multiple tests.
When to Check hCG Levels
- After a positive home pregnancy test to confirm the pregnancy.
- If you have a history of ectopic pregnancy or miscarriage.
- During early IVF pregnancy monitoring, usually starting 12-14 days post transfer.
Quick Reference Ranges
Week 3 5 - 50
Week 4 5 - 426
Week 5 18 - 7,340
Week 6 1,080 - 56,500
Week 7-8 7,650 - 229,000
Values shown in mIU/mL. Full table available after calculation.
Medical Disclaimer
- This calculator provides an estimate only and is not a substitute for professional medical advice.
- hCG levels vary widely between pregnancies. A single test is not diagnostic.
- Always discuss your hCG results with your doctor or fertility specialist.
- Declining or abnormal hCG levels require immediate medical consultation.
Private: all calculations run in your browser. Nothing you enter is sent to a server or stored.
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