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
Ovulation Calculator
Find your estimated ovulation day and 6-day fertile window from how many days ago your last period started, your average cycle length, and your luteal phase. Use it when trying to conceive or to understand your cycle timing.
Fill in the required fields to see your result.
Key differences
| Due Date Calculator | Ovulation Calculator | |
|---|---|---|
| Category | Pregnancy | Pregnancy |
| Inputs required | 4 | 4 |
| Result | Due Date Countdown | Ovulation & Fertile Window |
| 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. | Find your estimated ovulation day and 6-day fertile window from how many days ago your last period started, your average cycle length, and your luteal phase. Use it when trying to conceive or to understand your cycle timing. |