Pregnancy Calculator
Calculate your due date and track pregnancy milestones week by week. Get trimester information and baby development updates.
weeks and days
👶 Baby Development - Week
Developments This Week
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About Pregnancy Calculator
The Pregnancy Calculator is a free online wellness tool that helps you take informed decisions about your health. Calculate your due date and track pregnancy milestones week by week. Get trimester information and baby development updates. This Pregnancy Calculator uses research-backed formulas and clear explanations so you can understand the numbers behind your health goals. Everything runs in your browser — your personal data never touches our servers, keeping sensitive information private. Use it to track progress, plan changes, or share results with your doctor or coach.
Use Cases
How to use
Choose how to date the pregnancy in Calculation Method: Last Menstrual Period, Conception Date, IVF Transfer or Ultrasound Date.
For the default method, set First Day of Last Menstrual Period on the date picker; for IVF Transfer add the Transfer Date and Embryo Age of Day 3 or Day 5.
If you picked Ultrasound Date, enter the scan date plus Weeks at Ultrasound and the extra days from 0 to 6.
Read the Estimated Due Date card with weeks pregnant, days and trimester, and watch the progress bar fill from conception to due date.
Check the key date tiles for conception estimate, end of first and second trimester, Safe Zone Start, Full Term and Due Date Range.
Scroll to Baby Development to see this week's size comparison and the countdown of days until due at the bottom.
Pro Tips
- Measure yourself at the same time of day for consistency — small daily variations can skew the Pregnancy Calculator result.
- Round inputs conservatively — being too optimistic on numbers usually leads to unrealistic goals.
- Track results over weeks, not days. The Pregnancy Calculator output becomes more meaningful as a trend.
- Discuss significant changes with a healthcare professional. The Pregnancy Calculator provides estimates, not medical advice.
- Combine the Pregnancy Calculator with complementary tools (water intake, sleep, calorie tracking) for a fuller picture of your health.
Frequently Asked Questions
No. The Pregnancy Calculator is an educational tool. For clinical decisions, always consult a qualified healthcare provider.
No. The Pregnancy Calculator runs in your browser, and your health data never leaves your device. We do not log or store any personal information.
The Pregnancy Calculator uses peer-reviewed formulas and returns mathematically correct results for the inputs provided. Real-world accuracy depends on how precisely you measure your inputs.
No. The Pregnancy Calculator provides estimates and general guidance only. Diagnosis requires a trained medical professional.
Yes. The interface is fully responsive and works on iOS and Android phones and tablets.
No. The Pregnancy Calculator is free to use as often as you like, with no signup, ads on results, or watermarks.