Pregnancy Due Date Calculator

To use this pregnancy due date calculator:

1. Enter the year, month, and day of the first day of your last menstrual period (LMP).
2. If your menstrual cycle is not the standard 28 days, expand the advanced settings and adjust your cycle length for a more accurate estimate.
3. The calculator instantly displays your estimated due date, how many weeks and days pregnant you are, your current trimester, and the number of days remaining.

Keep in mind that this is an estimate. Your healthcare provider may adjust the due date based on ultrasound measurements, especially during the first trimester.

A pregnancy due date calculator estimates when your baby is expected to be born based on the first day of your last menstrual period (LMP). It uses Naegele's rule, the same method healthcare providers use to determine your estimated due date (EDD).

The calculator also tells you how many weeks and days into your pregnancy you are, which trimester you are in, and how many days remain until your due date. This information helps you track your pregnancy milestones and prepare for your baby's arrival.

The due date is calculated using Naegele's rule with a cycle length adjustment:

• Estimated Due Date = LMP + 280 days + (Cycle Length − 28) days
• Days Pregnant = Today's Date − LMP Date
• Weeks Pregnant = Days Pregnant ÷ 7 (rounded down)
• Trimester:
  • First Trimester: Weeks 1 through 12
  • Second Trimester: Weeks 13 through 26
  • Third Trimester: Weeks 27 through 40
• Days Remaining = Due Date − Today's Date

Example 1: LMP of June 1, 2025 with a standard 28-day cycle. Due date = June 1 + 280 days = March 8, 2026. As of February 12, 2026, you would be approximately 36 weeks and 4 days pregnant, in the third trimester, with about 24 days remaining.

Example 2: LMP of May 15, 2025 with a 32-day cycle. Adjusted due date = May 15 + 280 + 4 = February 23, 2026. As of February 12, 2026, you would be approximately 38 weeks and 4 days pregnant with about 11 days remaining.