Beta hCG Calculator

The Beta hCG Calculator estimates hCG doubling time and gestational age based on blood test results and your last menstrual period. This tool helps pregnant individuals and healthcare professionals track hormone progression to ensure a healthy pregnancy. Whether you are monitoring early viability, ruling out complications, or confirming pregnancy milestones, this calculator provides reliable insights into your condition.

Enter your most recent hCG blood test result
Enter days since the first day of your last menstrual period
Enter your previous hCG test result to calculate doubling time
Number of days between the two hCG tests

How hCG Progression Is Calculated

hCG progression measures how quickly the pregnancy hormone rises in your blood and estimates your current stage of pregnancy. This calculation uses a standard logarithmic formula to find the time required for your levels to double, which is a key indicator of early pregnancy health.

Doubling Time = (Duration * log(2)) / log(Current Level / Previous Level)

Where:

  • Duration = Time between tests in hours
  • Current Level = Latest blood test result
  • Previous Level = Earlier blood test result

We first determine gestational age by counting days from the first day of your last menstrual period. Next, we compare your current and previous hCG levels to calculate the rate of increase.

Step 1 establishes a timeline for your pregnancy, while Step 2 reveals if growth is normal. The logarithmic method is clinically accurate for tracking hormone changes over time.

What Your hCG Progression Means

Your results show if your pregnancy is progressing normally based on standard medical ranges for hormone levels.

Normal Doubling Time: If under 7 weeks, levels should double every 48 to 72 hours. Between 7 and 12 weeks, a doubling time of 72 to 96 hours is considered healthy and typical.

Slow or Low Increase: A doubling time longer than 96 hours or levels below the expected range may indicate a potential issue, such as a possible miscarriage or ectopic pregnancy.

Rapid Increase: Doubling faster than 48 hours is common in early viable pregnancies but may sometimes indicate multiples.

This tool is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your healthcare provider regarding your hCG levels and pregnancy health.

For the most accurate assessment, continue testing every 2 to 3 days until your levels reach the peak expected range for your gestational age.