Percentage calculator
Calculate percentages online, including percent of a number, percentage increase, and percentage decrease.
Due date / pregnancy calculator
Estimate a pregnancy due date from the first day of your last menstrual period and see the estimated current gestational age. Uses the standard 280-day calculation.
How to use Due date / pregnancy calculator
Estimate your pregnancy due date from the first day of your last menstrual period (LMP) using Naegele's rule (280 days from LMP). Also shows current pregnancy week.
The 280-day method assumes dating from LMP and does not adjust for cycle length, irregular periods, conception date, IVF transfer, or ultrasound measurements.
This is an estimate only. Ultrasound dating from your healthcare provider is more accurate. Always consult a medical professional for pregnancy care.
Due date / pregnancy calculator FAQs
Is Due date / pregnancy calculator free?
Due date / pregnancy calculator is a free online tool on ReallyUseful.Tools. No account is required.
Does Due date / pregnancy calculator run in my browser?
Due date / pregnancy calculator is designed to run in your browser where supported, so files can stay on your device instead of being uploaded to a server.
More Calculators
Age calculator
Calculate exact age from date of birth in years, months, days, and more with a simple online age calculator.
BMI calculator
Calculate your BMI online using height and weight. Get body mass index results with metric and imperial units.
Mortgage calculator
Estimate monthly mortgage payments with loan amount, interest rate, term, deposit, taxes, and fees.
Loan calculator
Calculate loan payments, total interest, and repayment schedules for personal loans and other borrowing.