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Miscarriage Risk Calculator

Estimate your pregnancy loss odds based on current gestational age, maternal age, and optional personal factors.

Miscarriage Risk Estimator

Enter your current gestational age and maternal age. Add optional factors for a more personalized estimate.

Estimated Risk at 6w 0d
10.8%miscarriage risk estimate
Risk band: Moderate
Chance of continuing
89.2%
Week/day baseline
9.4%
Factor multiplier
×1.2
Risk trend by week
WeekEstimated riskChance continuing
6w10.8%89.2%
7w4.8%95.2%
8w2.9%97.1%
9w2.2%97.8%
10w1.7%98.3%
11w1.3%98.7%
12w1%99%
13w0.9%99.1%
14w0.8%99.2%
  • Baseline week/day probabilities are modeled from published population-level first-trimester loss data.
  • Age and optional factors adjust risk through multiplicative modifiers and do not represent a diagnosis.
  • This estimate reflects recognized pregnancy loss risk through about 20 weeks and should be interpreted with your clinician.
This tool gives a statistical estimate, not a diagnosis. If you have heavy bleeding, severe pain, dizziness, fever, or are worried, contact your clinician or urgent care immediately.
Ashok Kumar Poudel
Written by
Ashok Kumar Poudel
Health & Wellness Writer
Dr. Bina Basnet
Medically reviewed by
MBBS, MD — Gynecologist & Obstetrician
Last reviewed:
Feb 2026

How This Miscarriage Risk Estimate Is Calculated

This miscarriage risk calculator starts from gestational-age baseline probabilities from large population studies, then adjusts that baseline by maternal age and optional factors you provide. The output gives an estimated probability of recognized pregnancy loss (typically through 20 weeks) and the complementary probability of ongoing pregnancy.

What the numbers mean

Estimated miscarriage risk = baseline week/day risk × factor multipliers

Baseline risk is highest in early weeks and generally declines quickly as pregnancy progresses. For example, commonly cited data show risk around 9.4% at 6 weeks, 4.2% at 7 weeks, and often around 1–2% after 8 weeks in many pregnancies.

Factors that can change risk

Maternal age strongly influences risk across the first trimester. Optional factors such as confirmed fetal heartbeat, bleeding/cramping symptoms, previous miscarriages, previous live birth history, and BMI can move your estimate up or down. A fetal heartbeat usually lowers risk; active bleeding or recurrent prior losses may raise it.

Important limitations

Any online risk score is probabilistic and cannot confirm or exclude miscarriage for an individual pregnancy. Ultrasound findings, serial hCG trends, exam findings, and clinician judgment remain essential. Use this as a context tool for discussion with your obstetric provider.

Frequently Asked Questions

Common questions answered by our medical team

The calculator starts with gestational-age baseline risk and then applies multipliers for maternal age and optional factors (such as fetal heartbeat, bleeding, prior losses, and BMI). The result is a statistical estimate, not a diagnosis.

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