UD5 Toolkit
Corrected Age Calculator - Online for Premature Babies
Calculate corrected (adjusted) age for premature infants based on birth date and due date. Important for developmental milestone tracking. Local only.
Pregnancy Due Date Calculator - Online LMP & Gestation Tool
Pregnancy Due Date Calculator
Calculate your estimated due date and track your pregnancy progress using your last menstrual period (LMP) or conception date. Updated for 2025 — free, private, and instant.
Enter Your Dates
Frequently Asked Questions
The due date is typically calculated using Naegele's rule: add 280 days (40 weeks) to the first day of your last menstrual period (LMP). If you know your conception date, 266 days are added instead. This calculator offers both methods and instantly shows your expected due date (EDD).
Only about 5% of babies are born exactly on their due date. Most arrive within a week before or after. This date is a useful estimate; your healthcare provider may adjust it based on ultrasound measurements, especially during the first trimester.
If your cycles are irregular or you’re unsure of your LMP, an early ultrasound is the most reliable way to determine your due date. This calculator assumes a standard 28‑day cycle, so you should discuss your personal estimate with your doctor.
Pregnancy is divided into three trimesters: first trimester (week 1–13), second trimester (week 14–27), and third trimester (week 28–40). Each trimester brings different developmental milestones for your baby and different changes for you.
Yes. If you know the embryo transfer date, use the conception date method. For a Day‑3 transfer, subtract 3 days; for a Day‑5 blastocyst transfer, subtract 5 days to estimate the conception date, then enter it above. Always confirm with your fertility clinic.
A pregnancy is considered full term between 39 weeks and 40 weeks 6 days. Births before 37 weeks are preterm, and births after 42 weeks are post‑term. Your due date marks the end of the 40th week.
Pregnancy Weeks to Months Converter - Online Trimester Guide
Convert pregnancy weeks into months and trimesters. Simple reference table with baby size comparisons. Informational only.
Credit Card Payoff Calculator - Online Debt Repayment Plan
Calculate how long it will take to pay off credit card debt with fixed monthly payments or a payoff goal. Understand interest costs fully.
Circular Motion Calculator – Online Find Period, Speed, Force
Enter any two of radius, mass, speed, period, force to find the others. Physics student aid.
Contraction Timer – Track Labor Contraction Duration & Frequency
Press a button at the start and end of each contraction to log duration and frequency. Easily see when contractions become regular and it's time to go to the hospital.
Fetal Movement Kick Counter – Daily 10‑Move Tracker
Count your baby's kicks each day with a simple tap counter and timer. Helps pregnant individuals monitor fetal wellbeing according to medical guidelines.
Invoice Due Date Calculator – Net 30, Net 60 & Custom Terms
Calculate the exact due date for an invoice based on common payment terms like Net 30, Net 60, or custom days. Includes option to skip weekends and holidays for business days.
Pregnancy Week by Week Size – Online Fruit Comparison
Enter gestational week to see baby's approximate size compared to a fruit/veg. Visual fun.
Pregnancy Weight Gain Tracker - Online Weekly Chart by BMI
Plot weekly weight gain against recommended ranges based on pre-pregnancy BMI. IOM guidelines displayed. Data stored in localStorage.
Pregnancy Due Date Estimator - Online LMP & Cycle Length Tool
Estimate due date from last menstrual period or conception date. Uses Naegele's rule and shows week-by-week milestones. Local calculator for informational use.
Ovulation & Fertility Window Calculator - Online Cycle Tracker
Estimate ovulation day and fertility window from last menstrual period. Displays probable conception dates. Informational only; processes locally in browser.
Pregnancy Due Date Calendar - Online Conception & Weeks
Enter LMP or conception date and get detailed week‑by‑week milestones, trimester info, and due date. Educational only.