Estimated due date (EDD) is calculated using Naegele's rule: add 280 days to the first day of the last menstrual period (LMP) for a standard 28-day cycle. This calculator adjusts for non-standard cycle lengths and shows the current gestational week alongside the EDD.

How to use: Enter the first day of your last menstrual period and your average cycle length. Cycle lengths under 21 days or over 35 days are considered irregular — consult your gynaecologist for a more accurate EDD based on early ultrasound measurement.

Calculate your estimated due date (EDD) from your last menstrual period. This is an estimate — your doctor may adjust based on ultrasound measurements.

Due date is an estimate based on Naegele's rule (LMP + 280 days for 28-day cycle). Normal delivery can occur 38-42 weeks from LMP. Always confirm with your OB/GYN.

EDD Is an Estimate, Not a Deadline

Normal delivery can occur 38–42 weeks from LMP — about 2 weeks before or after the calculated EDD. Your OB/GYN may adjust the EDD based on first-trimester ultrasound measurements, which are more accurate than LMP calculation. In Pakistan, most antenatal care starts around 8–10 weeks — your first ultrasound EDD is considered more reliable than this LMP-based calculation if dates differ by more than 7 days.

Frequently Asked Questions

Yes — antenatal check-ups, ultrasounds, and delivery are provided free of charge at government district hospitals, teaching hospitals, and many tehsil hospitals. BISP beneficiaries additionally receive cash incentives for institutional delivery under the Nashonuma programme. Private hospitals charge significantly — establish a relationship with a gynaecologist early and discuss costs upfront.

Ideally within the first 12 weeks (first trimester). Early registration allows screening for high-risk factors, blood group testing, iron supplementation, and folic acid provision. In Pakistan's government system, register at your nearest government hospital maternity department; in private care, call your chosen clinic as soon as you confirm pregnancy.

Female employees in Pakistan are entitled to 12 weeks of paid maternity leave under the Maternity Benefit Ordinance for formal-sector employment. BISP beneficiaries receive additional support through Nashonuma (nutrition support for pregnant and lactating women). Punjab and Sindh have additional maternity schemes — check with your provincial labour department.