hCG Doubling Calculator
See how quickly your early-pregnancy hormone levels are rising between two blood tests.
Educational estimate only. Early-pregnancy hCG usually doubles every 48–72 hours, but healthy ranges vary widely and a single calculation can't confirm a healthy pregnancy. Always interpret hCG results with your healthcare provider.
Frequently asked
How fast should hCG rise in early pregnancy?
In the first weeks, hCG typically doubles about every 48–72 hours. The rate slows as levels get higher (above ~6,000 mIU/mL), which is normal.
What if my hCG isn't doubling?
A slower rise isn't always a problem — ranges vary a lot between healthy pregnancies. But it can sometimes need follow-up, so share your numbers with your provider, who may order a repeat test or ultrasound.
Can an hCG calculator confirm a healthy pregnancy?
No. It only estimates how quickly two values are rising. Only your provider, usually with ultrasound, can assess pregnancy health.
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