Baby Tools › hCG Calculator

hCG Doubling Time Calculator

Enter two beta hCG results to see how fast your levels are rising.

This tool is for general information only and is not medical advice. Always talk to your doctor or midwife about your pregnancy and your baby.

How it works

1Enter your first hCG result.

2Enter your second result and the hours between tests.

3See your doubling time and rate of rise.

What is a normal hCG doubling time?

In early pregnancy hCG often doubles roughly every 48–72 hours. As levels get higher, doubling naturally slows down.

My numbers didn't double — should I worry?

A single pair of numbers can't diagnose anything. hCG patterns vary a lot. Always discuss your results with your doctor.