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Miscarriage Risk Calculator

Understand pregnancy loss risk by gestational week, after a confirmed heartbeat, and how risk factors like age and pregnancy history affect your individual risk.

A note of care: If you are going through a pregnancy loss or are anxious about a current pregnancy, these are deeply difficult experiences. This tool is meant to provide factual, evidence-based information. Please reach out to your healthcare provider or a support line if you need compassionate guidance.
For informational use only — not a substitute for medical advice. All figures are population-level estimates.

Pregnancy Details

Enter gestational age and personal factors for a personalised risk estimate

Weeks

Days

Last menstrual period date

After a Pregnancy Loss

Understanding recurrence, recovery, and next steps

Risk at Your Stage

Estimated Risk
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LowerHigher
Gestational Age—
Base Rate (pop.)—
Adjusted Rate—
Heartbeat Status—

Positive Context

Ongoing pregnancy chance—
After heartbeat seen—
Recurrence after 1 loss—

Key Facts

• ~10–20% of known pregnancies end in miscarriage

• Most (>80%) occur in the first trimester

• ~50% are due to chromosomal abnormalities

• Risk drops significantly after a heartbeat is seen

• Most people go on to have healthy pregnancies after a loss