Pregnancy Due Date Calculator Calculate estimated due date from last period, conception date, or IVF transfer with progress tracking.
Pregnancy Due Date Calculator
Calculate estimated due date from last period, conception date, or IVF transfer with progress tracking.
Choose Method
Select LMP, conception date, or IVF transfer date.
Enter the Date
Input the relevant date for your chosen method.
View Results
See estimated due date, gestational age, trimester, and progress bar.
What Is Pregnancy Due Date Calculator?
The Pregnancy Due Date Calculator estimates your Expected Date of Delivery (EDD) using three different methods: Last Menstrual Period (LMP), conception date, or IVF transfer date. The LMP method (Naegele's rule) adds 280 days (40 weeks) to the first day of your last period and is the most commonly used clinical method. The conception date method adds 266 days, and the IVF transfer method adds 263 days (for a 3-day transfer). The calculator shows your current gestational age in weeks and days, which trimester you are in, a visual progress bar, and key milestone dates including trimester transitions.
Why Use Pregnancy Due Date Calculator?
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Three calculation methods: LMP, conception, and IVF transfer
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Shows gestational age, trimester, and visual progress tracking
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Displays key milestone dates (trimester boundaries)
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Days remaining countdown to estimated due date
Common Use Cases
Prenatal Care
Track pregnancy progress and plan prenatal appointments.
Birth Planning
Estimate delivery date for maternity leave and preparation.
IVF Patients
Calculate due date from embryo transfer date with adjusted formula.
General Reference
Understand gestational age and trimester milestones.
Technical Guide
The EDD calculation uses Naegele's rule for LMP: EDD = LMP + 280 days. This assumes a 28-day menstrual cycle with ovulation on day 14. For conception date: EDD = conception + 266 days (38 weeks of actual gestation). For IVF 3-day transfer: EDD = transfer + 263 days. Gestational age is calculated from the LMP (or equivalent date), expressed as weeks+days. Trimesters: 1st = weeks 0-12, 2nd = weeks 13-26, 3rd = weeks 27-40. Only about 5% of babies are born on their exact due date; the normal range is 37-42 weeks (term). Factors affecting actual delivery include first vs subsequent pregnancy, maternal age, and multiple gestation.
Tips & Best Practices
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1Only about 5% of babies are born on their exact due date
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2Full term is 37-42 weeks โ babies born in this range are considered on time
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3First-time mothers tend to deliver slightly later than the due date
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4An ultrasound in the first trimester is the most accurate way to determine due date
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๐ Date & TimeFrequently Asked Questions
Q How accurate is the due date calculation?
Q What if my cycle is not 28 days?
Q When does each trimester start?
Q What is gestational age vs fetal age?
Q Can exercise change my due date?
About This Tool
Pregnancy Due Date Calculator is a free online tool by FreeToolkit.ai. All processing happens directly in your browser โ your data never leaves your device. No registration or installation required.