Calculate your pregnancy weeks, track your due date countdown, and see your baby's development stage. Free online pregnancy week calculator.
Enter the first day of your last menstrual period to calculate your pregnancy week, due date, and baby development stage.
Split shared expenses by equal or weighted shares and calculate suggested repayments.
Use this tool →Professional countdown timer with holiday presets for events, meetings, birthdays, and special occasions. Set custom dates and get real-time countdown with progress tracking.
Use this tool →Time an activity with pause, laps and keyboard shortcuts. Milliseconds are displayed; measurement accuracy depends on your device and browser.
Use this tool →Enter the first day of your last menstrual period in the date field on the left.
See your current pregnancy week, trimester, due date, and days remaining at a glance.
Check your baby's size compared to familiar fruits and vegetables, updated each week.
Calculate your pregnancy weeks, track your due date countdown, and see your baby's development stage. Free online pregnancy week calculator.
Enter the first day of your last menstrual period to calculate your current pregnancy week, estimated due date, and trimester. See your baby's development stage with weekly size comparisons to familiar fruits and vegetables.
All data is stored locally in your browser and never uploaded to any server. No registration required.
See your exact pregnancy week and day with a visual progress bar showing how far along you are.
Each week your baby is compared to a familiar fruit or vegetable so you can visualize their growth.
Get your estimated due date calculated via Naegele's rule with a live days-remaining countdown.
Pregnancy Monitoring — Track your current trimester, week, and day to stay informed about your baby's development stage.
Appointment Planning — Know your exact gestational age to schedule prenatal checkups, ultrasounds, and lab tests on time.
Milestone Sharing — Share fun baby size updates and week-by-week progress with family and friends.
Standards and research behind this tool, from official specifications to peer-reviewed studies.
Everyday health tracking works best in small, countable units. The US National Academies' Dietary Reference Intakes set general guidance for daily water, potassium, and sodium needs, around which hydration trackers are designed. Step counting, sleep hours, and weekly habit streaks follow the same principle that behavior scientist BJ Fogg teaches: tiny, measurable actions repeated daily are more durable than ambitious goals. Counters make those units visible without an account or an app.
The US National Academies' Dietary Reference Intakes for water, potassium, sodium, chloride, and sulfate.
www.nap.edu
Stanford behavior scientist BJ Fogg's model of how prompts, ability, and motivation combine to create habits.
behaviormodel.org
