Expecting a baby? Our Pregnancy Calculator estimates your delivery date and provides a detailed pregnancy timeline based on your due date, last menstrual period (LMP), ultrasound, conception date, or IVF transfer date. Perfect for pregnancy planning, prenatal care, or preparing for your newborn, this tool offers reliable insights to guide your journey.
A Pregnancy Calculator predicts your baby’s due date and provides a week-by-week timeline, also known as the estimated date of confinement (EDC). It uses key pregnancy milestones to provide:
Only ~4% of babies arrive exactly on their due date, so think of it as a midpoint within a 37–42-week term range.
The calculator estimates your due date and pregnancy timeline using one of five methods, each based on standard pregnancy timelines:
Example (LMP Method):
LMP: April 13, 2025
Due Date: April 13 + 280 days = January 18, 2026
You’ll get:
✔ Estimated delivery date
✔ Pregnancy timeline with milestones
✔ Fetal development details
✔ Tips for pregnancy planning
Pregnancy is a term used to describe a woman’s state over a time period (~9 months) during which one or more offspring develops inside of a woman. Childbirth usually occurs approximately 38 weeks after conception, or about 40 weeks after the last menstrual period. The World Health Organization defines a normal pregnancy term to last between 37 and 42 weeks. During a person’s first OB-GYN visit, the doctor will usually provide an estimated due date (based on a sonogram). Alternatively, the due date can also be estimated based on a person’s last menstrual period.
Only ~4% of births occur on the exact due date, 60% occur within a week, and almost 90% occur within two weeks of the due date. As such, while it is possible to be fairly confident that a person’s child will be born within about two weeks of the due date, it is currently not possible to predict the exact day of birth with certainty.
Pregnancy can be detected either by using pregnancy tests or by the woman herself noticing symptoms, including a missed menstrual period, increased basal body temperature, fatigue, nausea, and increased frequency of urination.
Pregnancy tests involve the detection of hormones like hCG, which serve as biomarkers for pregnancy. Clinical blood tests are more accurate and can detect pregnancy from six to eight days after fertilization, while home urine tests are convenient but may be less precise.
Several factors need consideration during pregnancy, including:
Certain medications can affect the fetus. In the U.S., drugs are classified into categories A, B, C, D, and X by the FDA based on fetal risks. Consult your doctor before taking any medication during pregnancy.
Weight gain is essential and varies by individual. The Institute of Medicine recommends 25–35 pounds for normal-weight women (BMI 18.5–24.9), 28–40 pounds for underweight, 15–25 pounds for overweight, and 11–20 pounds for obese women.
Regular aerobic and strength-conditioning exercise can improve fitness and reduce C-section risks. Consult your doctor if symptoms like vaginal bleeding or decreased fetal movement occur.
Proper nutrition, including folic acid and DHA omega-3, is crucial for fetal development. Pregnant women should consult dietitians to meet specific nutritional needs.
Q1: How accurate is the pregnancy calculator?
✅ Its an estimate; only 4% of babies arrive exactly on time. Most deliver within 37–42 weeks.
Q2: Which method is most reliable?
✅ Early ultrasound (8–12 weeks) is the most accurate, followed by IVF and LMP methods.
Q3: Can it predict twins due dates?
✅ This calculator is for single pregnancies. Twins often deliver earlier, so consult your doctor.
Q4: What if my cycle length varies?
✅ Adjust the LMP input for your average cycle length for better accuracy.
Q5: Why consider a due date range?
✅ Babies born between 37–42 weeks are considered term, so a range prepares you for variations.
Our Free Pregnancy Calculator simplifies pregnancy planning by estimating your delivery date and providing a detailed timeline. Whether using due date, LMP, ultrasound, conception, or IVF data, it helps you prepare for your baby’s arrival with confidence.
🚀 Start planning your pregnancy today!
Note: The results of this calculator are estimations based on averages for single pregnancies. The results for twin or multiple pregnancies may differ.
This Pregnancy Calculator content is independently researched and authored based on obstetric guidelines from ACOG and global health standards.
Pregnancy is a term used to describe a womans state over a time period (~9 months) during which one or more offspring develops inside of a woman. The due date is typically set at 40 weeks from the last menstrual period.
Note: Results are estimations based on averages for single pregnancies.