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Due Date Calculator

Calculate your pregnancy due date and all three trimester date ranges using Naegele's rule.

First Day of Last Menstrual Period

Average Cycle Length (days)

Estimated Due Date (Naegele's Rule)

Estimated Conception

Weeks Remaining

Trimester Breakdown

Naegele's rule: LMP + 280 days, adjusted for cycle length vs. 28-day average.

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About Due Date Calculator

Our free Due Date Calculator helps you run quick, accurate calculations for everyday financial and mathematical needs with just a few inputs. Calculate your pregnancy due date and all three trimester date ranges using Naegele's rule. Enter your values, and the calculator instantly shows detailed results with breakdowns you can understand. No signup, no ads interrupting your workflow — just accurate, reliable calculations you can trust. Works on any device, saves nothing to our servers.

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