Pregnancy Calculator
Find out how many weeks pregnant you are and your trimester.
Pregnancy dates are estimates and do not replace prenatal medical care.
Pregnancy calculator
Choose a calculation method and enter the date details you know.
LMP method counts pregnancy from the first day of the last period.
Cycle length can shift estimated ovulation and due date.
Estimated pregnancy week
12w 1d
Approximately 85 days gestational age.
Estimated due date
Friday, February 12, 2027
Based on last menstrual period.
Current trimester
First trimester
Days until due date
195 days
Pregnancy progress
30.4%
Pregnancy dates are estimates. Prenatal care, ultrasound dating, IVF details, and complex medical histories should be guided by qualified healthcare professionals.
Personalized interpretation
Based on last menstrual period, you may be approximately 12 weeks and 1 days pregnant.
Your estimated due date is Friday, February 12, 2027.
You may currently be in the first trimester.
Pregnancy dating is approximate and may be revised after an ultrasound or clinician assessment.
Seek medical care promptly for concerning symptoms such as heavy bleeding, severe pain, fainting, chest pain, shortness of breath, severe headache, or reduced fetal movement later in pregnancy.
Pregnancy timeline overview
Pregnancy start / LMP
May 8, 2026
Estimated conception
May 22, 2026
Current week
Jul 31, 2026
Third trimester starts
Nov 20, 2026
Estimated due date
Feb 12, 2027
This timeline is based on the selected calculation method. Actual clinical dates may vary.
Gestational age explained
Due date and trimester guide
First trimester
Weeks 1–13
Early pregnancy dating is commonly based on gestational age from LMP.
Second trimester
Weeks 14–27
Prenatal care timing and scans should follow clinician guidance.
Third trimester
Weeks 28–40+
The final trimester includes continued growth, monitoring, and birth preparation.
Due date is an estimated delivery date, not a guaranteed birth date. Most babies are not born exactly on the due date, and trimester boundaries can vary slightly by source.
Calculation methods explained
Last menstrual period
Uses the first day of your last period and cycle length.
Conception date
Uses a known or estimated conception date.
Due date
Works backward from an existing estimated due date.
IVF transfer
Uses transfer date and embryo age.
Why dates can change
Exact delivery date cannot be predicted by a calculator. Calculated pregnancy week is a planning estimate, not a diagnosis.
Limitations and medical disclaimer
Calculator results are informational only. Pregnancy dating is approximate, and prenatal care should be guided by healthcare professionals.
IVF details and complex medical histories should be reviewed clinically.
Seek urgent medical attention for symptoms such as heavy bleeding, severe abdominal pain, fainting, severe headache, chest pain, shortness of breath, or reduced fetal movement later in pregnancy.
Formula / date explanation
LMP method: Estimated Due Date = First Day of Last Menstrual Period + 280 daysConception method: Estimated Due Date = Conception Date + 266 daysGestational Age = Today − First Day of Last Menstrual PeriodPregnancy Progress = Gestational Age Days ÷ 280 × 100280 days is about 40 weeks from LMP. 266 days is about 38 weeks from conception. IVF due date depends on transfer date and embryo age. Ultrasound or clinician assessment may override calculator estimates.
Frequently Asked Questions
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Estimate only. This calculator is for general education and planning. It is not medical advice, and not medical, nutrition, fitness, diagnosis, treatment, or emergency advice. Personal factors can change results. Dates are estimates based on the inputs provided. Cycle length, ovulation timing, pregnancy dating, and medical factors can vary. Speak with a qualified professional for personal guidance.
Related reading
Learn the formula, assumptions, examples, or context behind this tool.