Ovulation Calculator

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When was the first day of your last menstrual cycle?
You need to select a valid date.
How many days are there in your menstrual cycle?
Your cycle length is the number of days from the first day of your period to the first day of your next period. The average cycle length is 28 days.
(Default: 28)
How many days are there in your luteal phase?
Typically, the duration of the luteal phase lasts between 10 and 16 days, and is generally consistent from cycle to cycle, averaging around 14 days for most women. Other calculators are used this average as the default luteal phase length. In our calculator you can specify this value.
The luteal phase, also referred to as 'days past ovulation' or 'DPO', is the part of the cycle that starts at ovulation and ends the day before your next period. It usually lasts about 14 days and does not vary by more than a day in each person.
(Default: 14)

Based on the dates and information you gave us, your next estimated strongest fertility day is No data available, which would mean you should take a pregnancy test on No data available.

If you were to get pregnant during this period, your due date would be No data available.

Ovulation Calendar Key

Ovulation Calendar Key
To see results for next month click on next month.
If you need to reset calculator, Use recalculate button.

The ovulation calendar allows you to effectively predict when you are most fertile each month. You can use the calendar to try and increase your chances on falling pregnant as well as understand when the optimal time to take a pregnancy test is.
Simply let us know when the first day of your last menstrual cycle was as well as how long your cycle and luteal phase lasts and then we can do the rest!

If you don't know the length of either your menstrual cycle or luteal phase then you can leave these as the average value of 28 and 14 respectively. However, we recommend that you record these as it can help predict more accurately your ovulation dates.
Please note, that the dates given in ovulation calendar are based on a regular menstrual cycle. If your cycle is irregular this may not be the most accurate way to work out when you are ovulating.
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