Pregnancy Due Date Calculator
Estimate your due date, current gestational age, trimester, and more — from LMP, conception date, or a known due date.
Options
Your Due Date
Early first trimester
0-13 weeks13
14-26 weeks27
27+ weeks40
Days to Go
280 Days to Go
Full term (37 weeks): January 3, 2027 — in 259 days
January 2027
Your Body: Recommended Weight Gain
Based on IOM / National Academies guidelines for singleton pregnancy using pre-pregnancy BMI.
Pre-pregnancy BMI: 23.3 (Normal weight)
Recommended gain: 25–35 lb (11.3–15.9 kg)
Your Energy: Extra Calorie Needs
Typical additions to pre-pregnancy maintenance calories by trimester.
Trimester 1
No significant increase recommended
Medical disclaimer
All estimates on this page — due date, gestational age, trimester, weight gain targets, and calorie needs — are for informational and educational purposes only. They are not a substitute for professional medical advice, diagnosis, or treatment. Always confirm your due date and care plan with a qualified healthcare provider.
How the pregnancy calculator works
The most common way to estimate a due date (EDD) is Naegele's rule: add 280 days (40 weeks) to the first day of your last menstrual period (LMP). If you know your conception date, we add 266 days (38 weeks). These methods assume a roughly 28-day cycle with ovulation around day 14; early ultrasound dating is more accurate, especially with irregular cycles.
- Gestational age counts from LMP — so at 2 weeks gestational age, conception has just occurred.
- Trimesters: First 0–12w6d, second 13w0d–26w6d, third 27w0d onward.
- Full term is 37 weeks; 40 weeks is the estimated due date; 42+ weeks is considered post-term.
How to use this calculator
- Choose whether to calculate from LMP, conception date, or a known due date.
- Pick the date from the date picker. The "As of" date defaults to today.
- Review your estimated due date, current gestational age, trimester, countdown, and estimated conception/fertile window.
- Optionally enter pre-pregnancy height and weight for a BMI-based weight-gain range, and a baseline calorie amount for trimester-based calorie guidance.
Week-by-week pregnancy overview
A typical timeline of what happens during pregnancy. Every pregnancy is different — this is a general reference, not a prediction for any individual.
Weeks 1–4
Fertilization and implantation. Many people don't know they're pregnant yet; a missed period is often the first sign.
Weeks 5–8
Major organs begin forming. Common symptoms: fatigue, nausea, tender breasts, frequent urination.
Weeks 9–12
End of the first trimester. Miscarriage risk drops; energy often returns. First-trimester screening may be offered.
Weeks 13–20
Baby bump typically appears. Anatomy ultrasound around 18–22 weeks. First fluttery movements ("quickening") may be felt.
Weeks 21–27
Baby becomes more active; you may feel regular kicks. Glucose screening for gestational diabetes around 24–28 weeks.
Weeks 28–36
Third trimester: rapid fetal growth. More frequent prenatal visits. Tdap vaccine and Group B strep test are common.
Weeks 37–40
Full term. Baby moves into position; early labor signs (mucus plug, Braxton Hicks, contractions) may appear.
Week 40+
If you pass your due date, your provider will discuss monitoring and possible induction by 41–42 weeks.
When to call your doctor or seek care
Medical disclaimer
All estimates on this page — due date, gestational age, trimester, weight gain targets, and calorie needs — are for informational and educational purposes only. They are not a substitute for professional medical advice, diagnosis, or treatment. Always confirm your due date and care plan with a qualified healthcare provider.
Contact your healthcare provider — or go to the hospital — if you experience any of the following:
- Vaginal bleeding or spotting
- Severe or persistent abdominal or pelvic pain
- Reduced or absent fetal movement (in later pregnancy)
- Regular contractions before 37 weeks
- Rupture of membranes ("water breaking"), especially before 37 weeks
- Severe headache, changes in vision, or sudden swelling of the face/hands — possible signs of preeclampsia
- High fever, repeated vomiting, or inability to keep fluids down
- Painful urination, burning, or signs of a UTI
- Any symptom that feels serious or "off" to you
Typical prenatal appointment schedule
Schedules vary by provider and country. A common pattern for a low-risk pregnancy is:
- Weeks 4–28: about every 4 weeks
- Weeks 28–36: about every 2 weeks
- Weeks 36–delivery: weekly
Common tests and milestones include first-trimester screening (~11–13 weeks), anatomy ultrasound (~18–22 weeks), glucose screening (~24–28 weeks), Tdap vaccine (~27–36 weeks), and Group B strep test (~36–37 weeks).
Safe vs. avoid during pregnancy
Medical disclaimer
All estimates on this page — due date, gestational age, trimester, weight gain targets, and calorie needs — are for informational and educational purposes only. They are not a substitute for professional medical advice, diagnosis, or treatment. Always confirm your due date and care plan with a qualified healthcare provider.
Foods to avoid or limit
- Raw or undercooked meat, fish, and eggs
- High-mercury fish (shark, swordfish, king mackerel, tilefish)
- Unpasteurized milk and soft cheeses
- Deli meats and hot dogs (unless heated until steaming)
- Alcohol
- Excessive caffeine (generally keep under ~200 mg/day)
Generally encouraged
- Prenatal vitamin with folic acid
- Balanced diet with fruits, vegetables, whole grains, protein
- Moderate regular exercise (walking, swimming, prenatal yoga)
- Good hydration and adequate sleep
- Recommended vaccines (flu, Tdap, COVID — per your provider)
Activities to avoid
- Smoking, vaping, and recreational drugs
- Hot tubs and saunas
- Contact sports and activities with fall risk
- Scuba diving
- Heavy lifting beyond what's comfortable
Medications & supplements
- Confirm every medication — prescription, over-the-counter, and herbal — with your provider before taking it.
- Take folic acid as directed (typically 400–800 mcg/day).
- Avoid retinoid skin products and high-dose vitamin A.
Hospital bag checklist (pack by ~36 weeks)
Documents
- Photo ID and insurance card
- Hospital pre-registration paperwork
- Birth plan (if you have one)
For you
- Comfortable going-home outfit
- Robe, slippers, nursing bras
- Toiletries, lip balm, hair ties
- Phone, charger (long cable), snacks
- Pillow and comfort items
For baby
- Going-home outfit and swaddle
- Installed, rear-facing car seat
- Blanket and a couple of onesies
Frequently asked questions
How accurate is the due date?
Only about 4–5% of babies are born on their exact estimated due date. Most arrive within a week or two either side. Early ultrasound dating (before 13 weeks) is the most accurate way to confirm gestational age.
How is gestational age different from fetal age?
Gestational age is counted from the first day of your LMP, which is about two weeks before conception. Fetal (embryonic) age is counted from conception, so it's roughly two weeks less than gestational age.
What if my cycle isn't 28 days?
LMP-based due dates assume a 28-day cycle with ovulation around day 14. If your cycles are longer, shorter, or irregular, your actual due date may be earlier or later — an early ultrasound is the best way to confirm.
When is a pregnancy considered full term?
Babies born between 37w0d and 38w6d are considered "early term," 39w0d–40w6d is "full term," 41w0d–41w6d is "late term," and 42+ weeks is "post term."
How much weight should I gain?
The IOM recommends 28–40 lb if you start underweight, 25–35 lb at a normal BMI, 15–25 lb if overweight, and 11–20 lb if obese. Your provider may suggest different targets based on your health.
Do I really need to "eat for two"?
No. Most guidelines suggest no added calories in the first trimester, about +340 kcal/day in the second, and about +450 kcal/day in the third — much less than a second full meal.
Related calculators
- BMI Calculator — check your pre-pregnancy BMI category.
- Days Ago Calculator — count days, weeks, or months between any two dates.
Medical disclaimer
All estimates on this page — due date, gestational age, trimester, weight gain targets, and calorie needs — are for informational and educational purposes only. They are not a substitute for professional medical advice, diagnosis, or treatment. Always confirm your due date and care plan with a qualified healthcare provider.