Estimate your next several period dates and most probable ovulation windows from your last period and cycle length.
Each future period is projected by repeatedly adding your average cycle length to the start date of your last period. Ovulation for each cycle is estimated the same way as our Ovulation Calculator: about 14 days before that cycle's next period starts.
Cycle length naturally varies from month to month for most people — stress, illness, travel, and many other factors can shift timing. The further out a projected cycle is, the more that natural variation can accumulate, so treat later cycles in the table as rougher estimates than the very next one.
Use your typical or average cycle length for the best estimate, and treat the projections as a general guide rather than an exact schedule — irregular cycles make advance predictions less reliable.
This tool also projects your period date ranges across 6 cycles, while our Ovulation Calculator adds extra fertility details like the intercourse window and an estimated due date if that cycle resulted in pregnancy.
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