Estimate Your Current Chance of Miscarriage
This tool gives a rough statistical estimate based on age, gestational week, and common risk factors. It is educational only and cannot diagnose a pregnancy.
Medical disclaimer: If you have pain, heavy bleeding, fever, dizziness, or any urgent concern, contact your obstetric provider or emergency services immediately.
How this chance of miscarriage calculator works
This calculator combines several known population-level factors to estimate the probability of miscarriage from your current week onward. The most important variables are maternal age and gestational age. In general, risk is highest early in pregnancy and decreases each week that the pregnancy progresses, especially after confirmation of fetal cardiac activity.
To keep the tool practical, it uses a simplified model rather than a full medical risk engine. That means the result should be treated as an informational range, not as a diagnosis or prediction for an individual pregnancy.
What factors are included
- Maternal age: baseline risk increases with age, especially after 35 and more sharply after 40.
- Gestational week: remaining risk usually declines as pregnancy progresses.
- Prior miscarriages: recurrent prior losses can raise future risk.
- Bleeding in this pregnancy: spotting can occur in normal pregnancies, but heavier bleeding is linked with higher risk.
- Smoking: tobacco use is associated with increased pregnancy complications, including miscarriage risk.
- Conception type: IVF pregnancies can reflect a different baseline risk profile due to underlying fertility factors.
How to interpret your result
Your result will show an estimated percentage and a broad range. The range exists because no short calculator can account for all medical details, including ultrasound findings, hormone trends, uterine anatomy, chronic conditions, or genetic factors.
- Lower estimate: generally reassuring, but not a guarantee.
- Moderate estimate: often indicates a need for routine follow-up and symptom monitoring.
- Higher estimate: does not confirm miscarriage; it suggests closer medical review is important.
Important clinical context
Most miscarriages are not caused by something you did
Many first-trimester losses are related to chromosomal abnormalities that occur at conception. This is emotionally difficult but medically common. People often blame themselves when they should not.
Risk falls over time
A key point many people find reassuring: as weeks pass, the chance of continuing pregnancy generally increases. That is one reason early follow-up scans and prenatal care are helpful—they provide updated, personalized information.
When to seek urgent care
- Heavy bleeding (soaking pads rapidly)
- Severe abdominal or one-sided pelvic pain
- Fainting, dizziness, or shoulder pain
- Fever or foul-smelling discharge
These symptoms may indicate urgent conditions such as ectopic pregnancy or significant blood loss and should not wait for online tools.
Ways to support a healthy pregnancy
- Start or continue prenatal care as early as possible.
- Take prenatal vitamins with folic acid unless your clinician advises differently.
- Avoid smoking, vaping nicotine, alcohol, and illicit drugs.
- Discuss all medications and supplements with your provider.
- Manage chronic conditions (thyroid disease, diabetes, hypertension) with medical guidance.
- Prioritize sleep, hydration, and balanced nutrition.
Frequently asked questions
Can a calculator tell me if I will miscarry?
No. It can only estimate statistical probability. Diagnosis requires medical evaluation, often with serial ultrasound and lab testing.
Does spotting always mean miscarriage?
No. Spotting can happen in many ongoing pregnancies. Still, it is worth reporting to your provider so they can advise next steps.
If I had one miscarriage before, is this pregnancy likely to miscarry too?
Most people with one prior miscarriage go on to have healthy pregnancies. One prior loss can increase risk slightly, but it does not mean repeat loss is expected.
Bottom line
This chance of miscarriage calculator is a helpful way to frame risk in understandable numbers. Use it as a conversation starter with your obstetric clinician—not as a substitute for care. If symptoms change or anxiety rises, reach out early. Personalized medical guidance is always more accurate than any general online estimate.