Labor Probability Calculator
Estimate the likelihood of going into labor based on your pregnancy progress
Calculate Your Labor Probability
Enter your pregnancy details below to estimate the probability of going into labor within the next week.
Your Pregnancy Details
Probability Results
Probability of labor within next week
Most likely time frame:
38-39 weeks
Interpretation
Based on your current week, you have a moderate chance of going into labor within the next week. This is just an estimate - every pregnancy is unique.
Labor Probability Timeline
Understanding Labor Probability
Gestational Age
The most significant factor in labor probability is how many weeks pregnant you are. Probability increases significantly after 37 weeks.
Previous Pregnancies
Those who have given birth before are more likely to go into labor earlier in their subsequent pregnancies compared to first-time mothers.
Cervical Changes
Cervical dilation and effacement can indicate that labor is approaching, though some women dilate weeks before labor begins.
Important Disclaimer
This tool provides statistical estimates based on population data and is not a substitute for professional medical advice. Every pregnancy is unique. Always consult with your healthcare provider about any questions or concerns regarding your pregnancy and potential labor signs.
Labor Probability Calculator
The Labor Probability Calculator helps expectant parents estimate the likelihood of labor starting within a given time frame. By considering factors such as gestational week, previous pregnancies, and symptoms like contractions, this tool provides insight into when labor may naturally begin. Whether you are looking for a labor probability calculator first child or a labor probability calculator second child, it adapts to different scenarios to provide useful estimates.
How Does the Labor Probability Calculator Work?
The probability of labor calculator uses statistical data from pregnancy studies to provide probability ranges. Labor likelihood generally increases as you approach or pass 40 weeks of pregnancy. Additional factors such as previous childbirths, contraction patterns, and cervical dilation can further influence probabilities. For example, spontaneous labor often occurs more quickly in second or later pregnancies compared to the first.
Features of the Labor Probability Calculator
- Estimates probability of labor within 24 hours, 7 days, and 14 days.
- Customizable inputs for gestational week and due date.
- Adapts calculations for first, second, third, or fourth pregnancies.
- Considers spontaneous labor probability based on natural progression.
- Mobile-friendly, easy-to-use design for quick results.
Probability of Labor by Pregnancy Order
| Pregnancy | Typical Labor Onset | Notes |
|---|---|---|
| First Child | 40+ weeks (later average) | Labor is more likely to start after the due date for first pregnancies. |
| Second Child | 39–40 weeks | The labor probability calculator second child shows a higher chance of earlier labor. |
| Third Child | Around 39 weeks | The labor probability calculator third child often indicates faster labor progression. |
| Fourth Child | Before or at 39 weeks | The labor probability calculator fourth child usually shows the shortest average labor onset. |
Spontaneous Labor Probability
A spontaneous labor probability calculator considers only natural progression without medical induction. Studies suggest that most women go into labor spontaneously between 37 and 42 weeks, with probabilities increasing sharply after 39 weeks.
For more medical insights on labor and delivery timelines, visit CDC: Maternal and Infant Health – Preterm Birth .