Select the method that best matches the information available to you. The result is an estimate, not a guaranteed delivery date.
| Stage | Gestational age | Estimated date range | Population estimate |
|---|
| Month | Approximate weeks | Start | End | Trimester |
|---|
Calculations saved here are available only until this page is refreshed or closed.
These are general educational milestones. Appointment timing and testing should always follow your provider's plan.
Appointment schedules differ by country, provider, hospital and individual risk.
| Visit | Typical timing | Estimated date | Common focus |
|---|
| Trimester | Gestational age | Approximate start | Approximate end |
|---|
Select a week to view typical development, maternal changes and practical reminders. These descriptions are general summaries and do not replace an ultrasound or clinical assessment.
Measurements are illustrative population averages. A wide range can be healthy, and the baby's own scan measurements are the relevant measurements.
| Week | Approximate size | Length | Weight | Measurement reference |
|---|
Development occurs continuously and many windows overlap.
| System | Typical development window | General description |
|---|
These are approximate research-based windows. Fetal perception is complex, and individual development varies.
| Ability | Approximate window | General information |
|---|
| Week | Typical changes | Possible symptoms |
|---|
Do not rely on this list alone. Contact your healthcare provider or emergency services if something feels seriously wrong.
This is a calendar estimate only. Ovulation can vary between cycles and this tool should not be used as contraception.
Work backwards from an estimated due date to obtain approximate dates.
This is a general reference based on pre-pregnancy BMI categories. It is not a target and should not be used to restrict food or attempt weight loss during pregnancy.
This is a date calculator only. Laws, contracts, eligibility and payment rules vary by location and employer.
These features are provided for entertainment and general interest only. They are not medical predictions.
This traditional chart has no scientific validity and performs no better than chance. Never use it for a medical, family or personal decision.
Many providers discuss movement tracking from around 28 weeks. Follow your provider's instructions. If movements are reduced or noticeably different, contact your maternity unit immediately rather than waiting to complete a count.
Record the beginning and end of each contraction. Some providers discuss a 5-1-1 pattern, but your provider may give different instructions.
Use this as a simple record to discuss with your healthcare provider. It does not set targets or provide medical judgments.
These are general suggestions only. Confirm what applies to your pregnancy, location and care plan with your provider.
It applies standard calendar calculations and presents general pregnancy information using population averages. It can estimate a due date from several common inputs, display educational milestones and provide simple personal tracking tools during the current browser session.
- Last menstrual period: 280 days from the first day of the last menstrual period, adjusted for cycle length and luteal phase length.
- Conception or ovulation date: 266 days from the estimated conception date.
- IVF day 3 transfer: 263 days after transfer.
- IVF day 5 transfer: 261 days after transfer.
- IVF day 6 transfer: 260 days after transfer.
- Egg retrieval or IUI: 266 days after the procedure date.
- Ultrasound dating: The scan date plus the remaining time to 280 gestational days.
- Known due date: Other dates are calculated backwards from the date entered.
When clinical dating differs from a calendar estimate, follow the dating method selected by your healthcare provider.
- Only a small proportion of babies are born on the exact estimated due date.
- A normal delivery window is commonly described as 37 to 42 weeks, but care plans vary.
- Pregnancy length, fetal growth and symptoms vary significantly between individuals.
- Growth figures in this application are population averages and are not personal measurements.
- Appointment schedules and testing recommendations vary by country, provider and individual risk.
- Medical guidance changes over time, so local clinical advice should take priority.
This version does not use local storage or session storage. Entries such as dates, notes, movement counts, weight logs and checklist progress are held only in JavaScript memory while this page remains open. Refreshing or closing the page clears them. No information is uploaded by this page.
All content is provided for general educational purposes only. This application does not provide medical advice, diagnosis, treatment, prescriptions or clinical recommendations. Use of this application does not create a doctor-patient, midwife-patient or other professional relationship.
Never delay, avoid or cancel professional medical care because of information displayed by this application. If you believe you may have an emergency, contact your local emergency service, maternity unit, doctor or midwife immediately.
Examples include heavy bleeding, severe or persistent abdominal pain, severe headache with visual changes, sudden swelling, fluid leakage, fever, reduced or changed fetal movement, chest pain, difficulty breathing, fainting, severe itching or a painful swollen calf. This list is not complete and does not determine whether a symptom is safe.
Birth-month information and the traditional gender predictor are provided only for entertainment. They have no scientific validity and must not be used for medical, family, financial or personal decisions. Any legal restrictions in your location remain your responsibility.
This application is provided as available, without a guarantee of accuracy, completeness, currency, suitability or uninterrupted operation. You use it at your own risk and should verify important information with a qualified healthcare professional.