What is it & why use it?
Easily calculate your pregnancy due date and track important milestones with our Due Date Calculator. This tool on Calci.in is helpful for expecting parents to plan pregnancy care.

Formula (explained)
Estimated Due Date = Date of Last Menstrual Period (LMP) + 280 days (40 weeks)
Variables: LMP = first day of last menstrual period, 280 days = average pregnancy length.

Example calculation
LMP = 1 Jan 2025 → EDD = 8 Oct 2025 (approx).

Benefits & use cases
• Track pregnancy timeline
• Plan prenatal checkups
• Prepare for baby’s arrival

Related calculators on Calci.in
Ovulation Calculator
Baby Growth Percentile Calculator
Vaccination Schedule Calculator

External references (authority sources)
Mayo Clinic – Pregnancy Due Date
NHS – Due Date

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FAQs
Q1: How accurate is the due date?
A: It’s an estimate; actual delivery may vary by 1–2 weeks.
Q2: Can I calculate due date without knowing LMP?
A: Yes, ultrasound scans provide accurate estimates.
Q3: Is pregnancy always 40 weeks?
A: Average is 40 weeks, but babies may arrive between 37–42 weeks.
Q4: Why is due date important?
A: It helps schedule medical care and prepare for delivery.