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Calculate gestational age instantly using LMP or IVF method. Easy online Gestational Age Calculator to find pregnancy weeks, days, and due date.
A Gestational Age calculator is a simple online tool that helps you find the exact age of a pregnancy. It tells how many weeks and days have passed since the first day of the last menstrual period (LMP) or embryo transfer in IVF cases. This calculator is widely used in pregnancy tracking, prenatal care, and due date estimation.
Doctors, midwives, and pregnant women use gestational age to monitor fetal growth, plan ultrasound scans, and estimate the expected delivery date. With a Gestational Age calculator, everything becomes fast, accurate, and easy without manual counting.
Gestational age is the measurement of pregnancy duration starting from the first day of the last menstrual period. It is not calculated from the date of conception but from LMP because ovulation timing is often uncertain.
Gestational age is usually expressed in weeks and days such as 22 weeks 3 days or 10 weeks 5 days. This standard helps medical professionals track fetal development consistently.
The basic formula used in a Gestational Age calculator is very simple.
Gestational Age in days = Calculation Date minus LMP Date
Then,
Weeks = Gestational Age in days divided by 7
Days = Remaining days after dividing by 7
In IVF pregnancy cases, the formula is slightly different.
Gestational Age = (Current Date − Embryo Transfer Date) + 17 days for Day 3 embryo
Gestational Age = (Current Date − Embryo Transfer Date) + 19 days for Day 5 blastocyst
To estimate the due date, the standard formula is:
Estimated Due Date = LMP Date + 280 days
Using an online Gestational Age calculator is very easy.
The tool instantly shows your gestational age in weeks and days, estimated due date, trimester stage, and sometimes remaining days until delivery.
Let’s understand with a simple example using the LMP method.
Suppose the first day of the last menstrual period is 1 January 2026 and the calculation date is 9 June 2026.
First, we calculate the total number of days between both dates, which is 159 days.
Now we convert it into weeks and days. When we divide 159 by 7, we get 22 weeks and the remaining 5 days.
So the final gestational age becomes 22 weeks 5 days.
If we also estimate the due date, we add 280 days to the LMP date, which gives an approximate delivery date.
A Gestational Age calculator is an essential tool for pregnancy tracking. It removes manual calculation errors and provides instant, accurate results. Whether it is a normal pregnancy based on LMP or an IVF pregnancy based on embryo transfer, this tool makes the process simple and reliable.
It helps in monitoring fetal growth, planning medical checkups, and estimating the expected delivery date with high accuracy. For any pregnancy-related planning, a Gestational Age calculator is one of the most useful tools available online.
It is an online tool that calculates pregnancy age in weeks and days based on LMP or IVF data.
It is calculated by subtracting the LMP date from the current date and converting the result into weeks and days.
A full-term pregnancy usually lasts around 40 weeks or 280 days.
Yes, in IVF cases, gestational age can be calculated using embryo transfer date.
No, gestational age starts from LMP while fetal age starts from conception, usually about 2 weeks later.