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Period & Ovulation Calculator
Predict your next period, calculate estimated ovulation date, and track your fertile window.
First Day of Your Last Period
Average Cycle Length (Days)
20 Days
21 Days
22 Days
23 Days
24 Days
25 Days
26 Days
27 Days
28 Days (Standard Average)
29 Days
30 Days
31 Days
32 Days
33 Days
34 Days
35 Days
36 Days
37 Days
38 Days
39 Days
40 Days
41 Days
42 Days
43 Days
44 Days
45 Days
Average Period Duration (Days)
2 Days
3 Days
4 Days
5 Days (Average)
6 Days
7 Days
8 Days
9 Days
10 Days
Calculate Predictions
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