Enter the first day of your last period and your average cycle length to forecast your next several expected period dates.
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This calculator repeatedly adds your average cycle length to the first day of your last period to project each subsequent period's start date, up to the number of cycles you choose to forecast.
The Ovulation Calculator focuses on a single upcoming ovulation date and fertile window. This tool instead forecasts a longer list of upcoming period start dates, useful for general planning rather than conception timing.
It assumes your cycle length stays consistent, which is a simplification, real cycles can vary from month to month, especially with irregular cycles, so treat this as a planning estimate rather than a guarantee.
You can forecast up to 12 cycles ahead by adjusting the 'Number of Cycles to Forecast' field.
No, this tool forecasts a list of upcoming period dates. The Ovulation Calculator instead estimates a single ovulation date and fertile window for conception planning.
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