Pregnancy Due Date Calculator

About this tool

The Pregnancy Due Date Calculator estimates the expected delivery date from the first day of your last menstrual period using the standard method clinicians use (Naegele's rule: LMP plus 280 days), and shows current gestational progress in weeks and days.

Knowing gestational age week by week anchors everything in early pregnancy: when tests and scans are scheduled, how symptoms map to development stages, and how care guidelines apply. This calculator is for orientation — your provider's dating scan is the medical reference.

What people use it for

• Get an estimated due date immediately after a positive test, before the first prenatal appointment.
• Track the current week of pregnancy to follow along with week-by-week development guides.
• Plan work leave, travel cut-offs, and family logistics around the expected window rather than a single date.
• Adjust the cycle-length input if your cycles are longer or shorter than 28 days for a better estimate.

Tips for better results

• Only about 4–5% of babies arrive on their exact due date; think of it as the midpoint of a window from 37 to 42 weeks.
• A first-trimester ultrasound dates pregnancy more accurately than LMP, particularly with irregular cycles — expect your provider to possibly revise the date.
• Count from the first day of the last period, not from conception; gestational age runs about two weeks ahead of embryonic age by convention.

How this tool helps

Pregnancy Due Date Calculator is built for people comparing real-world numbers before they make a financial, health, planning, or business decision.

Calculate an estimated due date and gestational progress using your last menstrual period details.

Utiliora tools are designed to work directly in modern browsers with clear input labels, mobile-friendly controls, and accessible result panels. Use related utilities below to continue your workflow without switching apps.

Most calculator inputs stay in the browser session and do not require an account.

What you can accomplish

• Turn the inputs behind pregnancy due date calculator and lmp due date into a clear result you can review immediately.
• Compare scenarios by changing one variable at a time instead of guessing from a single estimate.
• Use the result as a planning aid alongside professional, local, or account-specific advice when the decision is high stakes.

Recommended workflow

1. Enter the known values first, then adjust the uncertain values after you see the first result.
2. Check the units, date ranges, tax assumptions, fees, and rounding before using the number in a budget or report.
3. Save or copy the output into your notes with the assumptions that produced it.

Quality and trust checks

• The result updates from transparent inputs instead of hiding the formula behind a signup wall.
• Labels are written for quick scanning on mobile and desktop.
• Outputs separate the main answer from supporting totals so users can spot mistakes.

Calculator results are estimates, not legal, medical, tax, lending, or investment advice. Local rates, eligibility rules, fees, and policy changes can alter the final outcome.