Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Pregnancy
Due Date Calculator
Calculates how many days remain until your estimated due date from how many days ago your last period (or conception) occurred, adjusting for cycle length or luteal phase.
Fill in the required fields to see your result.
Pregnancy
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.
Fill in the required fields to see your result.
Key differences
| Due Date Calculator | Due Date Calculator | |
|---|---|---|
| Category | Pregnancy | Pregnancy |
| Inputs required | 4 | 1 |
| Result | Due Date Countdown | Days until due date (days) |
| What it does | Calculates how many days remain until your estimated due date from how many days ago your last period (or conception) occurred, adjusting for cycle length or luteal phase. | 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. |