Ovulation Calendar

Our ovulation calendar helps you determine the best time for you to use an ovulation test.

Step 1

First, determine the length of your normal menstrual cycle. It could be anywhere from 20 to 45 days long. Start counting on day one of your period (the first day of bleeding or spotting) and stop counting on the first day of your next period. This is the length of your menstrual cycle. If the length of your menstrual cycle is different each month by more than just a few days, then simply take the average number of days over the last three months.

Step 2

Once you determine the length of your menstrual cycle or an average number of days, you can use the chart below to help determine the day you should begin testing. On the top row of the chart, find the number that corresponds to the length of your menstrual cycle. Directly below that number is a smaller number. This is the day of your menstrual cycle when you should begin testing.

Example

Here’s an example: Sally Smith has a regular menstrual cycle of 28 days and started her period on the 4th day. Beginning with the 4th as Day 1, she counts forward 11 days and begins testing on the 14th.

DETERMINING THE LENGTH OF YOUR CYCLE (DAYS)
Length of cycle (days)
Using the first day of bleeding or spotting as Day 1, count forward the following number of days to begin testing.
21
04
22
05
23
06
24
07
25
08
26
09
27
10
28
11
29
12
30
13
31
14
32
15
33
16
34
17
35
18
36
19
37
20
38
21
39
22
40
23

cal-example

Please note
It isn’t necessary to do your testing in the morning. Any time of day is fine. However, you should test at approximately the same time each day. Also, drinking excessive amounts of liquid can dilute the LH in your urine. Therefore, it’s best to reduce your liquid intake for two hours before testing.