< WhenMyBaby Calculators...

When to Ovulation Test Calculator

Create your ovulation test days schedule for your current cycle, including when to start ovulation testing, and a chart to track your ovulation test results! Enter info about your cycle, and the start cycle day to test as per the instructions for the OPK you've purchased. Or, click your cycle length from the chart below which matches your OPK's instructions.


How to calculate cycle length

Check your OPK instructions; Can select on chart below

The number of tests provided with your OPK
Doesn't match your OPK Instructions?
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Average
Cycle Length
Start Testing
on Cycle Day #
21 5
22 5
23 6
24 7
25 8
26 9
27 10
28 11
29 12
30 13
31 14
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33 16
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40 23