Due Date Calculator vs Gestational Age Calculator
Two calculators for the same neighbourhood of questions. Here is what each measures, what you feed in, and where you'd reach for one over the other.
Due Date Calculator
Estimates your baby's due date by adding 280 days (40 weeks) to the first day of your last menstrual period (LMP) using Naegele's Rule. Use it in early pregnancy to plan prenatal appointments, milestones, and parental leave.
- Answers
- Days until due date (days)
- Inputs
- Last Menstrual Period
Gestational Age Calculator
Converts the number of days since your last menstrual period into gestational age expressed as weeks and days. Use it at any point in pregnancy to know your exact stage for prenatal care, screenings, and milestone tracking.
- Answers
- Gestational age (weeks)
- Inputs
- Days since Last Menstrual Period
At a glance
| Due Date Calculator | Gestational Age Calculator | |
|---|---|---|
| Category | Pregnancy | Pregnancy |
| Answers | Days until due date | Gestational age |
| Inputs | 1 | 1 |
| Result unit | days | weeks |
When to use each
Estimates your baby's due date by adding 280 days (40 weeks) to the first day of your last menstrual period (LMP) using Naegele's Rule. Use it in early pregnancy to plan prenatal appointments, milestones, and parental leave.
Converts the number of days since your last menstrual period into gestational age expressed as weeks and days. Use it at any point in pregnancy to know your exact stage for prenatal care, screenings, and milestone tracking.