If you would like to use a Clearblue Ovulation Test and are wondering when you should start testing, this tool can help you. Please note that this Ovulation Calculator tool is only for the Clearblue Digital Ovulation Test (7 tests) and Ovulation Combination Pack.

If you are testing with the Digital ONE-MONTH Ovulation Test (20 tests), start testing on Day 6 of your menstrual cycle. To work out when Day 6 is you should count the day your period starts as Day 1, and continue counting through to Day 6. This is the day you should start testing.
If your usual cycle length is 41 days or more, you can still use the Digital ONE-MONTH Ovulation Test, but you should start testing on Day 12 of your cycle. To work out when Day 12 is you should count the day your period starts as Day 1, and continue counting through to Day 12. This is the day you should start testing.

Just answer the two questions below and let us tell you when you should start testing.

If you don’t know your cycle length, we suggest you wait for your next cycle and note the day your period starts (Day 1) and the length of this cycle before using this online Ovulation Calculator tool*.

When was the first day of your last period? (optional)

How long is your average cycle? (required)
The length of your cycle is the number of days from the day your period starts (Day 1) to the day before your next period starts.
If your cycle length varies by more than 3 days every month, then choose the shortest cycle you have had over the last 6 months.