Pregnancy Calculator

Calculate the due date, current pregnancy week, and progress.

What do you want to enter?

First day of your last period

Cycle length: 28 days

21 d (short)28 d (standard)35 d (long)

Select a method and enter a date to get started.

Why use this? Pregnancy math is easy to get wrong — cycle length, conception window, due dates that move. A single discrepancy can mean the difference between "too early to test" and a clear result.

This calculator lets you cross-check dates from different angles (last period, conception, or due date) so you can spot inconsistencies before they cause confusion.

This calculator provides estimates based on standard formulas (Naegele's rule). It does not replace medical advice. Consult your OB/GYN for definitive dates.