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There are plenty of places online to find a menstrual cycle calculator. Tampax has a very nice menstrual cycle calculator. It is simple and easy to use.
Yes. It is suggested you use a scientific or graphing calculator-- although scientific calculators have a top-of-the-line price of about $14 USD.
if you can, you could always search a online calculator and use that.
Yes there is you shouldn't use it though on Calculator Soup.