Knowing the days you are most likely to be fertile can increase your chance of getting pregnant. A typical menstrual cycle is 28 days long, but every woman is different. There are about 6 days in each cycle when you can get pregnant. This is called your fertile window. Use the calculator to see which days you are most likely to be fertile.
Your most fertile days
Estimated ovulation date
Next period expected
| Fertile window | Ovulation | Period starts |
|---|
Your results will appear here.
This calculator gives an estimate only and is not medical advice. Cycles can change from month to month. If your periods are irregular or you have been trying to get pregnant for a while, please talk to your doctor.