Pregnancy Calculator
Estimate your due date, current gestational age, trimester, fertile window, and key pregnancy milestones using LMP, conception, IVF, or ultrasound details.
Due date is adjusted by cycle length compared with a 28-day cycle.
Free Pregnancy Due Date Calculator
Use this pregnancy calculator to estimate your due date, current pregnancy week, trimester, and important milestone dates. It supports last menstrual period, conception or IVF date, and ultrasound-based gestational age.
Due date estimate
Calculate an estimated due date from LMP, conception, IVF, or ultrasound information.
Pregnancy week tracker
See estimated gestational age in weeks and days with pregnancy progress toward 40 weeks.
Milestone timeline
Review common pregnancy milestone windows, including anatomy scan and trimester changes.
Copyable summary
Copy your estimated due date, gestational age, trimester, and selected input details.
How does a pregnancy calculator work?
A pregnancy calculator estimates the expected due date and pregnancy week using common obstetric dating methods. The most common method starts from the first day of the last menstrual period and adds about 280 days.
If conception, IVF, or ultrasound information is available, those dates can provide another way to estimate the timeline. This calculator shows the selected method clearly so the result is easier to understand.
Supported calculation methods
- LMP due date calculation with cycle length adjustment.
- Conception or fertilization date calculation.
- Ultrasound dating from scan date and measured age.
- Estimated trimester and pregnancy week tracking.
- Common milestone date estimates.
Common uses for this tool
- Estimate a pregnancy due date online.
- Check current gestational age in weeks and days.
- Understand the current trimester.
- Plan appointments around milestone windows.
- Copy a simple pregnancy timeline summary.
Important medical note
Pregnancy dates are estimates. Due dates and milestone timing can change based on cycle history, ultrasound findings, IVF details, and clinical assessment. Use this tool for planning and education, and rely on your healthcare professional for medical decisions.