Pregnancy calculator
Pregnancy Due Date Calculator
Estimate your due date, gestational age, and current trimester from the first day of your last menstrual period.
About This Pregnancy Due Date Calculator
This pregnancy due date calculator estimates a due date, gestational age, weeks pregnant, and trimester using the first day of the last menstrual period. It works locally in your browser on desktop and mobile devices.
The estimated due date is calculated by adding 280 days to the LMP date. LMP means last menstrual period, and it usually refers to the first day bleeding started in the most recent menstrual period before pregnancy.
The result is only an estimate because pregnancy dating can vary by cycle length, ovulation timing, and clinical measurements. This calculator provides an estimate only and does not replace medical advice or prenatal care. Always consult a qualified healthcare professional.
Pregnancy Due Date FAQ
How is the pregnancy due date calculated?
The estimated due date is calculated by adding 280 days, or 40 weeks, to the first day of the last menstrual period.
What does LMP mean?
LMP means last menstrual period. It refers to the first day of the most recent menstrual period before pregnancy.
Is the due date exact?
No. A due date based on LMP is an estimate and may differ from dates confirmed by a qualified healthcare professional.
How many weeks is a typical pregnancy?
A typical pregnancy is commonly estimated as 40 weeks from the first day of the last menstrual period.
Should I rely only on this calculator?
No. This calculator provides an estimate only and does not replace medical advice or prenatal care. Always consult a qualified healthcare professional.