Labor Probability Calculator - Daily Odds of Going Into Labor
See the statistical probability of going into labor on any given day. Probabilities update in real-time as your pregnancy progresses.
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This calculator uses a skewed normal distribution calibrated to epidemiological data on spontaneous labor onset. The key feature is conditional probability: as each day passes without labor starting, we remove that day from the distribution and recalculate. This means your daily probability of labor increases as your pregnancy progresses - which matches what doctors observe clinically.
This calculator provides statistical estimates based on population-level research and is not a substitute for medical advice. Every pregnancy is unique. Always consult your healthcare provider about your specific situation.