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Pregnancy Due Date Calculator

Calculate your baby's due date and track pregnancy milestones with a week-by-week timeline, trimester breakdown, and key appointments.

How would you like to calculate your due date?

🩸 Last Menstrual Period (LMP)

The first day of your last menstrual period

Your typical menstrual cycle length

Results

Ready to Calculate

Select a calculation method and enter your information to determine your due date and pregnancy milestones.

Note: This calculator provides estimates for educational purposes only and should not replace professional medical advice. Due dates are estimates and actual delivery dates can vary significantly. Always consult with your healthcare provider for accurate pregnancy dating, medical advice, and personalized care throughout your pregnancy journey. Only your doctor can provide accurate medical information based on your specific situation.

Complete Pregnancy Timeline

Track your pregnancy journey with detailed weekly development, trimester milestones, and important appointments

Prenatal Care Schedule

• Weeks 4-28: Monthly visits
• Weeks 28-36: Bi-weekly visits
• Weeks 36-40: Weekly visits
• Key Tests: Blood work, glucose screening, ultrasounds

Common Pregnancy Symptoms

• First Trimester: Morning sickness, fatigue, breast tenderness
• Second Trimester: Energy return, baby movements, round ligament pain
• Third Trimester: Back pain, heartburn, frequent urination
• Throughout: Mood changes, food aversions/cravings

Expected Changes

• Weight Gain: 25-35 lbs (normal BMI)
• Body Changes: Breast growth, belly expansion
• Symptoms: Nausea, fatigue, mood changes
• Movement: First felt around 16-20 weeks

Labor & Delivery Prep

• Birth Plan: Discuss preferences with provider
• Hospital Bag: Pack around 36 weeks
• Labor Signs: Contractions, water breaking
• Classes: Childbirth and breastfeeding prep

Understanding Pregnancy Due Dates

Learn about the different methods to calculate your due date, the pregnancy timeline, and important milestones

Last Menstrual Period (LMP)

Most common method using the first day of your last period. Assumes ovulation occurs 14 days into cycle.

Best for: Regular cycles, unsure of conception date
Accuracy: ±1-2 weeks

Conception Date

Most accurate if you know the exact date of conception or ovulation.

Best for: Fertility tracking, known ovulation
Accuracy: ±3-5 days

Ultrasound Dating

Uses fetal measurements to determine gestational age. Most accurate in first trimester.

Best for: Medical accuracy, irregular cycles
Accuracy: ±3-5 days (early), ±1-2 weeks (later)

IVF Transfer

Precise calculation based on embryo transfer date and development stage.

Best for: IVF pregnancies
Accuracy: ±1-2 days

Pregnancy Safety Guidelines

Essential information on substances to avoid, food safety, and environmental precautions during pregnancy

Substances to Completely Avoid

Smoking & Tobacco
• Increases risk of miscarriage, premature birth
• Can cause low birth weight and birth defects
• Secondhand smoke is also harmful
Alcohol
• No safe amount during pregnancy
• Can cause fetal alcohol spectrum disorders
• Affects brain and physical development
Illegal Drugs
• All illegal substances are dangerous
• Can cause severe birth defects
• Risk of miscarriage and stillbirth
Excessive Caffeine
• Limit to 200mg daily (1 cup coffee)
• High amounts linked to miscarriage
• Check all sources: tea, soda, chocolate

Foods to Limit or Avoid

• Raw/Undercooked: Fish, meat, eggs, unpasteurized dairy
• High-Mercury Fish: Shark, swordfish, king mackerel, tilefish
• Deli Meats: Unless heated until steaming hot
• Soft Cheeses: If made with unpasteurized milk
• Raw Sprouts: Alfalfa, clover, radish, mung bean
• Unwashed Produce: Always wash fruits and vegetables

Environmental Hazards

• Chemical Cleaners: Use natural alternatives when possible
• Paint Fumes: Avoid painting, ensure good ventilation
• Cat Litter: Risk of toxoplasmosis - have someone else clean
• Hot Tubs/Saunas: High temperatures can be harmful
• X-rays: Inform healthcare providers about pregnancy
• Pesticides: Avoid exposure to lawn and garden chemicals

Medication & Medical Safety

• Consult Before Taking: ANY medication, including over-the-counter
• Prenatal Vitamins: Start before conception if possible
• Avoid NSAIDs: Ibuprofen, aspirin (except low-dose if prescribed)
• Herbal Supplements: Not automatically safe - check with provider
• Dental Care: Safe and important during pregnancy
• Vaccinations: Some recommended, others avoided - discuss with doctor

When to Call Your Healthcare Provider Immediately

• Vaginal bleeding or spotting
• Severe abdominal pain or cramping
• Persistent vomiting (can't keep fluids down)
• High fever (over 101°F/38.3°C)
• Severe headaches with vision changes
• Sudden swelling of face, hands, or feet
• Decreased fetal movement (after 20 weeks)
• Signs of preterm labor

Pregnancy Due Date Calculator FAQ

Common questions about due date accuracy, LMP, ultrasound dating, cycle length, and IVF transfer estimates.

How accurate is a pregnancy due date?

A due date is an estimate, not a guaranteed delivery date. Many pregnancies deliver before or after the estimated date.

Which calculation method should I use?

Use last menstrual period if that is the best-known date, conception if known, ultrasound dating if your clinician provided it, or IVF transfer details for IVF pregnancies.

Why can ultrasound dating change the due date?

Early ultrasound measurements can provide dating information that differs from cycle-based estimates, especially when cycle length or ovulation timing is uncertain.

Does cycle length matter?

Yes. Cycle length can affect an LMP-based estimate because ovulation may happen earlier or later than the common 28-day-cycle assumption.

Is this calculator medical advice?

No. It is an educational estimate. Use your clinician's due date and guidance for prenatal care decisions.